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Application of environmental DNA metabarcoding in studying biodiversity of zooplankton and phytoplankton WU Yongjiang, CAI Mingcheng, SUN Hanchang, HU Huidie, DENG Yaxin, LONG Yinggen Journal of Fisheries Research    2023, 45 (4): 399-407.   DOI: 10.14012/j.cnki.fjsc.2023.04.010 Abstract （161）   HTML （1）    PDF （1064KB）（203）       Knowledge map    Save Phytoplankton and zooplankton are the primary producers and consumers of aquatic ecosystems, respectively. Their accurate identification is the basis for aquatic ecology research. Traditional identification of phytoplankton and zooplankton based on morphological characteristics of species is time-consuming and labor-consuming, difficulty in identification, and underestimating species diversity. Therefore, a simple, efficient, accurate and standardized solution for studying biodiversity of zooplankton and phytoplankton is very necessary. Environmental DNA (eDNA) metabarcoding technique has become a common method for studying aquatic biodiversity. It is mainly used in the studying of fish species diversity and has also been gradually used in the studying biodiversity of zooplankton and phytoplankton in recent years. This review firstly introduced the eDNA metabarcoding technique and its sampling method, and then focused on the application of this technique in the studying of biodiversity of zooplankton and phytoplankton to promote the development of eDNA metabarcoding technique in plankton diversity research. Table and Figures | Reference | Related Articles | Metrics

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Advances of genetic engineering modification in Chlorella ZHANG Tiantian, CHEN Bilian, ZHENG Mingmin Journal of Fisheries Research    2023, 45 (6): 593-602.   DOI: 10.14012/j.cnki.fjsc.2023.06.010 Abstract （141）   HTML （13）    PDF （1302KB）（185）       Knowledge map    Save Chlorella is a unicellular microalga that could grow and accumulate biomass through photosynthesis using sunlight and carbon dioxide. It is widely used to produce biofuels and other high-value products in fields like aquaculture, food, energy, and the environment. With the development of genetic engineering technology, research and applications of Chlorella at the molecular level have received increasing attention, making specific genetic modification possible. In this paper, we summarized and discussed the application of Chlorella in genetic engineering and protein production from four perspectives: transformation system, transformation methods, factors affecting transformation and expression of exogenous proteins. The aim of this review was to provide theoretical support and references for high-value products production of Chlorella. Table and Figures | Reference | Related Articles | Metrics

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Effects of four non-nutritive feed additives on digestive enzyme activity, immune function and in vitro digestibility of Australian freshwater lobster ( Cherax quadricarinatus) SONG Xuefei, ZHOU Qing, ZHANG Yingying, ZHANG Zhiyong, WANG Yan, YUN Taihong Journal of Fisheries Research    2023, 45 (4): 356-364.   DOI: 10.14012/j.cnki.fjsc.2023.04.005 Abstract （140）   HTML （0）    PDF （1072KB）（110）       Knowledge map    Save The aim of the present study was to explore the effects of four kinds of non-nutritive additives on the activity of digestive enzymes, immune function and in vitro digestibility of liver and pancreas of Australian freshwater lobster (Cherax quadricarinatus), and to screen out the appropriate feed additives, so as to provide a theoretical basis for the application and research of non-nutritive additives in feed. Citric acid (S-Ⅰ), complex enzyme preparation (S-Ⅱ), Lactobacillus plantarum plus Bacillus subtilis (S-Ⅲ), and rhizobium plus B.subtilis (S-IV) were used as the non-nutritive additives to feed Australian freshwater lobster for 14 days. Then, activities of enzymes [alkaline phosphatase(AKP), acid phosphatase (ACP), superoxide dismutase (SOD) and total antioxidant capacity (T-AOC)] as well as in vitro digestibility of feed (dry matter digestibility, protein digestibility and amino acid production rate) were detected. S-Ⅰ could significantly increase (P<0.05) the activities of amylase, AKP and SOD in the hepatopancreas of Australian freshwater lobster, and S-Ⅱ could significantly increase (P<0.05) the activities of amylase, trypsin and immune function. The digestive enzyme and immune function of S-Ⅲ and S-Ⅳ were significantly improved (P<0.05). Among the four non-nutritive feed additives, S-IV had the highest dry matter digestibility, protein digestibility and amino acid production rate in vitro. The digestive enzyme activity, immune function and in vitro digestibility of S-Ⅲ and S-Ⅳ were higher than those of S-Ⅰ or S-Ⅱ, and in vitro digestibility of S-Ⅳ was higher than that of S-Ⅲ, so S-Ⅳ was preferred among the four non-nutritive additives. Table and Figures | Reference | Related Articles | Metrics

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Detection and analysis of ostreid herpesvirus 1 (OsHV-1) in Fujian Province JIA Yuanyuan Journal of Fisheries Research    2023, 45 (4): 378-384.   DOI: 10.14012/j.cnki.fjsc.2023.04.008 Abstract （140）   HTML （0）    PDF （1068KB）（141）       Knowledge map    Save With the continuous expansion of oyster culture industry, the problem of oyster disease is becoming more and more serious. In recent years, ostreid herpesvirus 1 (OsHV-1) caused mass death of shellfish, which brought great economic losses to shellfish aquaculture industry. OsHV-1 infection occurred frequently in oysters, especially in the seedling stage. In this paper, 90 samples of Crassostrea gigas and C.angulata from six seedling growing enterprises and three sea areas in Fujian were tested for OsHV-1 by PCR and quantitative real-time PCR. The results showed that the average detection rate of OsHV-1 was about 11.11%. Among them, there were 30 seedling samples, while the positive detection rate of seedling samples was 23.33%, which was higher than the positive detection rate of 5% in adult shellfish, and the infection amount of positive samples in seedling was significantly higher than that in adult shellfish. The infection amount of OsHV-1 in C. gigas seedling sample was the highest, reached 6.1×107 copies/mg. This study could provide reference for the detection of ostreid herpesvirus as well as the prevention and control of oyster diseases. Table and Figures | Reference | Related Articles | Metrics

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Development status and countermeasure analysis of mainstream low carbon aquaculture technology at home and abroad under the double carbon background FENG Ying, ZENG Ya, REN Tongjun Journal of Fisheries Research    2023, 45 (6): 603-613.   DOI: 10.14012/j.cnki.fjsc.2023.06.011 Abstract （138）   HTML （6）    PDF （1712KB）（106）       Knowledge map    Save Carbon peaking and carbon neutrality are important measures to address climate change in China. Carbon emission reduction in aquaculture is crucial to achieving the dual carbon target. Therefore, studying and exploring low-carbon aquaculture technology has important practical significance. Based on the concept of low carbon development and the background of dual carbon goals, the present study analyzed the current situation and trends of low carbon aquaculture technology development at home and abroad, discussed the urgent issues to be solved in the development of low carbon aquaculture technology in China, and proposed relevant countermeasures in terms of innovation of low carbon technology, improvement of policies and regulations, and construction of professional personnel in combination with China’s national conditions, aiming at effectively reducing greenhouse gas emissions from China’s aquaculture industry,promoting high-quality green transformation of aquaculture industry to provide scientific reference and contribute to the realization of China’s dual carbon vision. Table and Figures | Reference | Related Articles | Metrics

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Design of actuator and control system for kelp automatic knotting machine HUANG Guifang, LIN Jianwei, WEI Guanyuan, DING Lan, CAI Wenhong, WEI Shengjun Journal of Fisheries Research    2023, 45 (6): 585-592.   DOI: 10.14012/j.cnki.fjsc.2023.06.009 Abstract （136）   HTML （8）    PDF （4468KB）（169）       Knowledge map    Save The kelp knots are the main product for exporting and earning foreign exchange in Chinese kelp culture provinces, but there are no mechanical processing devices. Therefore, the kelp knots are usually tied manually. Based on the principle of bionics, this paper offered an automatic knotting machine which could make the kelp forming a circle and passing through it to form a knot with the logic circuit. The test verified that this knotting machine was able to complete the operational requirements for kelp knotting accurately, which showed that this design was reasonable and feasible, and had the value of promotion and application after further optimization. It could also provide certain reference for the design and application of relevant knotting equipment. Table and Figures | Reference | Related Articles | Metrics

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Pathological analysis of scuticociliatosis of Larimichthys crocea in indoor circulating water culture YANG Guiqin, LI Xiaodong, LU Weijing, JIANG Fan, CHEN Ziqin, ZHANG Weini, CHEN Xinhua Journal of Fisheries Research    2023, 45 (6): 523-529.   DOI: 10.14012/j.cnki.fjsc.2023.06.001 Abstract （132）   HTML （8）    PDF （1951KB）（180）       Knowledge map    Save In order to investigate the common fish diseases in indoor culture of large yellow croaker (L.crocea), this study reports the occurrence of scuticociliatosis, a parasitic disease, on the surface of L.crocea in a laboratory circulating water recirculation system. The histopathological analysis of skin, liver and muscle of L.crocea was carried out to explore the pathogenic mechanism of scuticociliatosis. At the same time, in order to further identify the body surface parasitic Scuticociliatida ciliates of L.crocea, the pathogen was isolated, and the morphological characteristics of Scuticociliatida ciliates were analyzed by in vivo formaldehyde fixed microscopic observation and scanning electron microscope observation. The results revealed the presence of whitening symptoms on the head, skin, and fin base of L.crocea. Gill cover congestion and severe cases of white massive skin ulceration were observed, along with the infestation of a significant number of Scuticociliatida ciliates. Notably, no apparent pathological alterations were detected in the body tissue. Histopathological analysis showed that the skin and subcutaneous tissue were the main sites of infection with Scuticociliatida ciliates. Tissue necrosis, cytolysis and increase of inflammatory cells occurred in most areas of muscle tissue. Myofibril was obviously broken and muscle fiber space was enlarged, while the boundary between liver tissue cells was not obvious, the central vein was oppressed, mononuclear cells increased and parenchyma cells enlarged. It was observed that the body of the pathogen was mainly slightly pointed at the top, blunt and round at the back end of the body, and contained an obvious telescopic vesicle as well as a long flagellum. The pathogen was identified as Pseudocohnilembus persalinus by morphology. Taken together, the histopathological results showed that the Scuticociliatida ciliates could infect the body surface tissue of L.crocea, resulting in loss of protection and resistance. At the same time, this study can provide a certain reference basis for indoor healthy culture of L.crocea. Table and Figures | Reference | Related Articles | Metrics

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Genome analysis of pathogenic Vibrio harveyi strain TS-628 LI Chenrui, XU Rongliang, ZHANG Xiaoxu, CHEN Dongping, QIU Yuyang, CHEN Weiqin, QIN Yingxue Journal of Fisheries Research    2023, 45 (5): 415-426.   DOI: 10.14012/j.cnki.fjsc.2023.05.001 Abstract （130）   HTML （5）    PDF （2746KB）（171）       Knowledge map    Save V.harveyi is an important opportunistic pathogen of marine fish and invertebrates,which often causes serious diseases of mariculture animals and brings huge economic losses to the aquaculture industry.However,the virulence of V.harveyi isolated from different environments varies greatly.In the present study,the sequencing technology combining the second generation Illumina Hiseq platform and the third generation PacBio platform was used to sequence and analyze the genome of V.harveyi strain TS-628 isolated from the diseased Epinephelus awoara.The genome information of this strain was exploited to understand the virulence related genes of the pathogen,in order to provide data support for the subsequent research on the pathogenesis of V.harveyi and control of V.harveyi disease.The results revealed that the genome of V.harveyi strain TS-628 had two chromosomes and two plasmids.One of the plasmids was a newly discovered plasmid.The genome size of this strain was 6 151 198 bp,the GC content of the genome was 44.68%,the number of predicted genes were 5 658,the number of predicted virulence genes were 747.The 747 virulence genes were mainly related to bacterial adhesion,iron uptake and secretion systems.In addition,294 drug-resistant genes were found,reflecting that the V.harveyi strain TS-628 not only had the potential to encode multiple virulence factors,but also had the potential to resist multiple antibacterial agents. Table and Figures | Reference | Related Articles | Metrics

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Construction and evaluation of dissolved oxygen prediction model based on MIC-BP neural network CHEN Mengyun Journal of Fisheries Research    2023, 45 (4): 317-330.   DOI: 10.14012/j.cnki.fjsc.2023.04.001 Abstract （123）   HTML （4）    PDF （7427KB）（60）       Knowledge map    Save Dissolved oxygen is an important environmental factor that affects the growth of aquatic organisms and water environment. Accurate prediction of dissolved oxygen is beneficial to the healthy development of aquaculture. This study was based on the water quality data and meteorological data of online buoys SK11 and SK18 in Shuikou reservoir area of Minjiang River in Fujian from January to June, 2022. Then, back propagation(BP) neural network prediction model and MIC-BP neural network measurement model were used for machine learning, and the prediction results are given. At the same time, the prediction results of the two dissolved oxygen prediction models were compared and verified. The results showed that after the identification and screening of MIC (Maximum information coefficient), among the 13 input factors, the factors that had great correlation with dissolved oxygen include pH, water temperature, chlorophyll, electrical conductivity, turbidity, ammonia nitrogen concentration and nitrite nitrogen concentration. The effect of the mixed MIC-BP neural network model was obviously better than that of the independent BP neural network model. After the candidate factors were identified and screened by MIC, the performance of the model could be obviously improved. Compared with the independent BP neural network model, the results showed that the performance of MIC-BP neural network model at SK11 station decreased by 29.29%, RMSE decreased by 60.09%,and NSE increased by 27.63%,respectively. At station SK18, MAE decreased by 17.16%, RMSE decreased by 16.23%, and NSE increased by 12.77%,respectively. Table and Figures | Reference | Related Articles | Metrics

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Maximum sustainable yield of Psenopsis anomala in the northern South China Sea YIN Yuanyi, ZHANG Lijuan, LIAO Dongsheng, LI Lu, XIE Wenfeng, FENG Bo Journal of Fisheries Research    2023, 45 (4): 365-371.   DOI: 10.14012/j.cnki.fjsc.2023.04.006 Abstract （122）   HTML （0）    PDF （1390KB）（103）       Knowledge map    Save According to the stratified sampling survey data of fishery production from fishing ports along the northern South China Sea from 2008 to 2020, the biomass of P.anomala was assessed. The production of P.anomala mainly consisted of trawl net and gill net, accounting for 40.52% and 53.14% of the total catch, respectively. Twelve CPUE data were analyzed by surplus production models. The maximum sustainable yield was 47 402.96 tons inferred by equilibrium Schaefer model. The maximum sustainable yield was 36 739.93 tons inferred by equilibrium Fox model. The maximum sustainable yield was 29 198.74 tons inferred by non-equilibrium Schaefer model. Fishing effort exceeded the maximum sustainable level in double trawl with mainpower above 400 kW, single trawl with mainpower of 100~200 kW and gillnet with mainpower below 50 kW. Overfishing did not occur, and the utilization level was not beyond the optimum level in other fishing methods and mainpower segment. The total allowable catch of P.anomala is comprehensively set within 28~32 thousand tons in the northern South China Sea at present. Table and Figures | Reference | Related Articles | Metrics

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Study of AVS-SEM in surface sediments in cage farming of Zhanghu reservoir bay, Fujian Province JIANG Yixiong, JIANG Dongsheng, CHEN Zhi, ZOU Lizhen, CUI Lifeng, LIAN Chenyang Journal of Fisheries Research    2023, 45 (6): 559-568.   DOI: 10.14012/j.cnki.fjsc.2023.06.006 Abstract （118）   HTML （3）    PDF （1476KB）（71）       Knowledge map    Save In order to investigate the potential ecological risks of heavy metals at cage farming in surface sediments, 5 samples were collected from Zhanghu reservoir bay in Shuikou reservoir and the acid volatile sulfide (AVS) and simultaneously extracted metals (SEM) were studied. The results indicated that the AVS concentrations ranged from 0.57-2.13 μmol·g-1, and the SEM concentrations ranged from 1.66-6.35 μmol·g-1. Among heavy metals, Zn, Cr and Cu were the dominating metals, accounting for over 80% of SEM. By comparing the ratio of SEM to AVS, the values of annual average were ranged from 1.65-9.11. If Cr was not included in the calculation, the values were ranged from 1.42-7.75, and the value of (SEM-AVS) were mainly smaller than 5. These indicated that heavy metals were associated with the AVS phase in the sediments, while metals in surface sediments could not cause toxicity to benthic organism. Compared with the threshold of toxic effects, the most toxic metal was Pb in terms of individual heavy metals. According to the present study, the potential toxic effects of heavy metal release and hydrogen sulfide (H2S) production from sulfides on cage aquaculture should be on the alert. Table and Figures | Reference | Related Articles | Metrics

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Study on the differential expression of temperature tolerance related genes in Apostichopus japonicus between south-cultivated in Fujian Province and north-cultivated groups ZHU Zhihuang, LIN Qi, WU Jianshao, YANG Qiuhua Journal of Fisheries Research    2024, 46 (1): 1-10.   DOI: 10.14012/j.cnki.fjsc.2024.01.001 Abstract （117）   HTML （35）    PDF （2048KB）（94）       Knowledge map    Save In this study,juvenile A.japonicus (experimental group) were purchased from northern China and reared in southern China under natural water temperature for one year.The same age seedlings of juvenile A.japonicus (control group) were directly collected from northern China to compare their thermal resistance with those of the experimental group.The study of thermal limits showed that the sublethal temperature of A.japonicus in the experimental group was 32 °C,significantly higher than the 30 °C in the control group.The ULTs50 of A.japonicus in the experimental and control groups were 33.1 °C and 31.9 °C,respectively.These results demonstrated that the thermal history influenced the upper thermal limit of A.japonicus,and A.japonicus undergoing continuous thermal shock would possess stronger thermal resistance.Additionally,the expression patterns of HSP90a,gp96,HSP70,HSP26,and proeintl(2)efl genes after heat shock for 1,2,and 3 hours between the experimental and control groups were analyzed using qRT-PCR.The expression patterns of HSP90a,gp96,HSP70,HSP26,and proeintl(2)efl genes were different between the experimental and control groups.At 30 °C heat shock,the gene expressions of HSP90a,gp96,HSP70,and HSP26 in the control group did not noticeably increase after stimulation for 1 and 2 hours but were significantly up-regulated at 3 hours,with expression values reaching (9.801±1.303),(2.508±0.910),(8.649±1.936),and (34.787±4.978),respectively.However,all of the HSP90a,gp96,HSP70,and HSP26 gene expressions in the experimental group were dramatically up-regulated at 1 hour at 30 °C,with expression values reaching (42.000±8.798),(20.019±6.224),(218.750±78.701),and (93.710±5.674),respectively.These four temperature-tolerant related genes detected in the present study in the experimental group were up-regulated earlier than those in the control group,indicating a higher ability of A.japonicus in the experimental group to respond adaptively to heat shock than that in the control group.Therefore,the research showed that A.japonicus undergoing high temperature acclimation could respond earlier to external environmental heat conditions. Table and Figures | Reference | Related Articles | Metrics

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Correlation analysis between the nacre color and the shell color of four selected strains of mussels, Hyriopsis cumingii LUO Yu, ZHANG Wenfu, REN Gang, CHENG Xiaoling, FANG Aiping, YE Ronghui, ZHANG Wenna, AN Xianbo, ZHANG Genfang Journal of Fisheries Research    2023, 45 (5): 438-447.   DOI: 10.14012/j.cnki.fjsc.2023.05.003 Abstract （114）   HTML （2）    PDF （2260KB）（149）       Knowledge map    Save The nacre color is the main factor that determines the color of the cultivated pearls.The nacre color trait has become an important target trait of the genetic improvement of the pearl oyster,but the measurement of the nacre color is difficult,which seriously limits the efficiency of pearl mussel breeding.Using 1-year-old red,blue,golden and white strains of juvenile H.cumingii as experimental materials,the color parameters L,a and b values were obtained by the X-Rite ColorEye XTH spectrophotometer,while correlation analysis,principal components analysis,and regression analysis were performed on each color parameter to explore the correlation between nacre color and shell color.The results showed that the nacre color and the shell color of the four H.cumingii strains were significantly correlated,and the correlation between the nacre color and the shell color of the red and blue strains was relatively stronger.The L,a and b values of nacre color in red and blue strains were all significantly correlated with at least one color parameter in shell color.Among them,the a value of nacre color in red strains had the strongest correlation with the b value of shell color,with the correlation coefficient as -0.557 (P<0.01).The L value correlation between the nacre color and the shell color was the strongest in the blue strain,and the correlation coefficient was 0.533 (P<0.01).The L value of the shell color in the golden strain was significantly correlated with the a and b values of the nacre color (P<0.05),and the correlation coefficients were 0.331 and 0.335,respectively.In the white strain,only the a value had a very significant correlation between the nacre color and the shell color (P<0.01),and the correlation coefficient was 0.286.This study reveals that the nacre color is correlated with the shell color in these four H.cumingii strains of juvenile mussels,which is of great significance for guiding the early selection of nacre color of H.cumingii. Table and Figures | Reference | Related Articles | Metrics

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Molecular identification of Oncorhynchus mykiss based on DNA barcode technology LI Zhaonan, LI Changzhong, BAO Changhong, HE Caixia, JIN Wenjie, CHEN Yanxia Journal of Fisheries Research    2023, 45 (4): 331-340.   DOI: 10.14012/j.cnki.fjsc.2023.04.002 Abstract （112）   HTML （2）    PDF （1949KB）（108）       Knowledge map    Save In order to ensure the healthy and sustainable development of cold-water fish culture industry, and to ensure consumers’ clear consumption and strengthen the market supervision, it is necessary to find an effective method for species identification of salmon and trout. In this study, cytochrome oxidase I gene (COⅠ) was used to develop a simple, economical and efficient molecular identification method, aiming at identifying O.mykiss. The results showed that COⅠ gene could distinguish diploid rainbow trout, Salmo salar, Oncorhynchus keta and Coregonus peled, but could not distinguish golden trout and triploid rainbow trout. In the follow-up study, we will try to identify related species according to other methods. In production practice, this method could provide a gene tag to identify O.mykiss, and provide technical support for its species identification and healthy development of industry. Table and Figures | Reference | Related Articles | Metrics

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Assessment of the resources of Schizothorax grahami in the headwaters of Chishui River based on the marking and recapture CHENG Yun, ZHAO Xiaosha, TANG Yongzhong, ZHANG Youzhao Journal of Fisheries Research    2023, 45 (5): 473-479.   DOI: 10.14012/j.cnki.fjsc.2023.05.007 Abstract （111）   HTML （2）    PDF （1079KB）（190）       Knowledge map    Save In order to understand the status of fishery resources after the implementation of conservation management and stocking of the Chishui River,and to provide a data base for future fish conservation and stocking work,this study was conducted in 2016 by using three methods of fluorescent tagging,dorsal fin T-tagging,and fin clipping tagging to mark and recapture S.grahami as an indicator species,and using breeding experiments to deduce the marker loss rate.Three samples were taken in May,June and July to assess the fish resources in the source section of the Chishui River.The results showed that the instantaneous resource numbers of S.grahami in the source section of the Chishui River during the assessment period were 1.99×104,2.12×104 and 1.68×104 individuals,respectively;the instantaneous biomass was 467.6 kg,726.1 kg and 909.3 kg,respectively.Both the clipped fin marker group and the dorsal fin T marker group suffered from fall off and loss,with the loss rate of the dorsal fin T marker increasing exponentially with the increase of breeding time.The evaluation results showed that the continuous proliferation and release had a significant effect on the stability of fish resources in the headwaters of Chishui River and was conducive to the recovery of fish resources. Table and Figures | Reference | Related Articles | Metrics

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Body mass of Seriola dumerili prediction model based on LSSA-XGBOOST improved algorithm YU Guoyan, ZUO Renyi, YAN Jun, LUO Yingtong, ZHU Qiheng Journal of Fisheries Research    2023, 45 (5): 427-437.   DOI: 10.14012/j.cnki.fjsc.2023.05.002 Abstract （108）   HTML （3）    PDF （2856KB）（127）       Knowledge map    Save In order to build an accurate feeding model using mass judgment and obtain the body mass state of S.dumerili in real time,this study built a body mass prediction model based on LSSA-XGBOOST algorithm.Firstly,the data of body length,body width and body mass measured by the culture experiment ship were detected by extreme studentized deviate (ESD) method,and the abnormal points were removed.Secondly,the chaotic random number generator was used to complete the initial population optimization of the SSA algorithm to improve its searching ability.The optimized SSA algorithm was used to optimize three parameters of the optimal tree depth,the optimal learning rate and the optimal number of iterations of the XGBOOST model.Finally,the LSSA-XGBOOST model with body length and body width as the input and body mass data as the output was constructed.The experimental results showed that,compared with the conventional mathematical model fitting,the LSSA-XGBOOST model fitting correlation coefficient R2 increased by about 10%.Compared with the traditional BP neural network and PSO particle swarm optimization BP,the error square and R2 were improved by about 3%,and the mean absolute error (MAE),mean square error (MSE) as well as the root mean square error (RMSE) were significantly reduced.It could be seen that LSSA-XGBOOST model was more accurate for predicting the body mass of small samples of S.dumerili,and the construction of LSSA-XGBOOST model was greatly significant for users to grasp the growth state of S.dumerili and build accurate feeding model for mass judgment. Table and Figures | Reference | Related Articles | Metrics

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Comparison analysis and path analysis of quantitative traits of triploid Crassostrea angulata cultured in inner and outside Huangqi Bay,Fujian Province QI Jianfei, WEI Shanshan, ZHENG Shenghua, LUO Huiyu, YAN Congyi, WU Qisheng, XU Cuiya, LIN Qi Journal of Fisheries Research    2023, 45 (5): 448-454.   DOI: 10.14012/j.cnki.fjsc.2023.05.004 Abstract （105）   HTML （1）    PDF （897KB）（82）       Knowledge map    Save To evaluate the culture performance of triploid Crassostrea angulata cultured in inner and outside Huangqi Bay,9 month ages oysters rope-cultured were sampled randomly in Huangqi Bay,Lianjiang,Fujian Province.The shell length(XL),shell width(XW),and shell height(XH),as well as the total weight(TW) and meat weight(MW) were measured for 85 individuals respectively.One-way analysis,multiple regression analysis and path analysis were used for investigating the morphological variation.One-way ANOVA showed that besides shell height,all morphological parameters of the oysters cultured outside the bay were significantly larger than those in the bay.The oysters cultured outside the bay were more round at shape and higher in meat condition.The optimum multiple regression equations were obtained though stepwise multiple regression analysis.As path analysis,the direct effects of morphological parameters on total weight were in order of shell length>shell width>shell height.Shell length had the maximum direct effect on the total weight,and was the major factor.The correlation indices (R2) of morphological parameters against the total weight was less than 0.850,indicating some other factors associating total weight,besides shell length,shell width and shell height,such as meat condition and shell weight. Table and Figures | Reference | Related Articles | Metrics

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Analysis and suggestions for promotion on tail water treatment mode of eel culture in Fujian Province ZHONG Guolong Journal of Fisheries Research    2024, 46 (1): 92-100.   DOI: 10.14012/j.cnki.fjsc.2024.01.010 Abstract （105）   HTML （6）    PDF （1794KB）（186）       Knowledge map    Save With the acceleration of China’s ecological civilization construction,the fishery has entered a new era of high-quality development.Eel,as one of the main freshwater aquaculture species of Fujian Province,the problem of its breeding tail water discharge has become increasingly prominent.Four primary treatment modes for eel culture in Fujian Province are currently employed.These modes include the conventional chemical treatment,the improved chemical treatment in industrial circulating water eel culture,the ecological comprehensive planting and breeding treatment,and the double circulation zero discharge eel culture treatment.This paper elucidates the primary technical processes and mode characteristics of eel culture tail water treatment.It also analyzes the key advantages and disadvantages of these processes and modes,and presents recommendations to promote future advancements in eel culture tail water treatment.The findings of this study serve as a valuable reference for enhancing aquaculture tail water treatment technology in Fujian Province,as well as nationwide. Table and Figures | Reference | Related Articles | Metrics

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Investigation of fish resources in the headwaters of Chishui River CHEN Wenshan, CHEN Bolin, LU Qun, LIU Jianhu, HE Tao, YANG Feng Journal of Fisheries Research    2024, 46 (1): 60-68.   DOI: 10.14012/j.cnki.fjsc.2024.01.007 Abstract （104）   HTML （8）    PDF （891KB）（95）       Knowledge map    Save To monitor fish resources and biodiversity in the headwaters of Chishui River,a comprehensive investigation was conducted using both traditional catch methods and environmental DNA (eDNA) technology from 2020 to 2021.A total of 48 fish species were identified,representing 4 orders,10 families,and 41 genera.Traditional fishing methods captured 23 fish species,spanning 2 orders,5 families,and 22 genera,while eDNA technology expanded the detection to encompass 4 orders,8 families,38 genera,and 40 species.In the analysis of fish species composition,the relative importance index (IRI) highlighted Schizothorax grahami,Acrossocheilus yunnanensis,Zacco platypus,and Semilabeo prochilus as the dominant species in the river section of the reserve.The Shannon-Wiener index registered at 2.99,indicating relatively rich overall fish resources and a relatively stable community structure.The catch Margalef index (D) reached 3.31,affirming the richness of fish species in the monitoring area,with a stable composition and population structure.Further assessment revealed a catch evenness index of 0.66,indicating a uniform distribution of population structure.Notably,differences in fish resources between the main river and tributaries were observed.Based on these findings,future conservation efforts should prioritize the core protection zone of the main stream,enhancing measures for fish diversity protection.Additionally,targeted interventions to restore tributary resources should be progressively implemented to elevate the overall resource level.This study provides valuable insights into the diverse fish species,their distribution,and recommendations for effective conservation strategies in the headwaters of Chishui River. Table and Figures | Reference | Related Articles | Metrics

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Discussion and suggestion on developing the polyethylene fishing boat CHE Xiaojun Journal of Fisheries Research    2023, 45 (4): 408-414.   DOI: 10.14012/j.cnki.fjsc.2023.04.011 Abstract （97）   HTML （1）    PDF （1311KB）（139）       Knowledge map    Save Polyethylene ships have been used and developed for many years in foreign countries, which started relatively late in China. In order to promote the development of polyethylene aquaculture fishing boats and help the development of green aquaculture industry, on the basis of summarizing the fishing boat inspection work and widely referring to published data, the author compared the polyethylene aquaculture fishing boats with the traditional wooden and steel aquaculture fishing boats, and summarized the advantages of polyethylene aquaculture fishing boats in the application. In this paper, the advantages of polyethylene fishing boats for green development of Chinese aquaculture industry were discussed, and the main disadvantages and development difficulties of polyethylene fishing boats were pointed out, while the solutions were put forward. Some suggestions was made in this paper for the development of polyethylene fishing boats, hoping to provide reference for the application and development of polyethylene fishing boats in aquaculture. Table and Figures | Reference | Related Articles | Metrics

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A north-south relay aquaculture experiment of Strongylocentrotus intermedius WANG Weigang Journal of Fisheries Research    2023, 45 (5): 455-461.   DOI: 10.14012/j.cnki.fjsc.2023.05.005 Abstract （96）   HTML （2）    PDF （1621KB）（101）       Knowledge map    Save In order to explore the feasibility of the north-south relay aquaculture model for S.intermedius between Fujian and Shandong Province,raft aquaculture experiments were conducted in the Qida sea area of Lianjiang,Fujian and Yandunjiao sea area of Rongcheng,Shandong from March 2021 to April 2022.Using abalone raft aquaculture facilities,regular feeding of kelp (Laminaria japonica) and asparagus (Gracilaria lemaneiformis) were carried out.After 13.5 months of breeding,the shell diameter of large-size S.intermedius had reached (61.97±2.38) mm,the body mass had reached (93.13±9.84) g,and the gonadal index had reached 17.69%±1.84%.The shell diameter of the middle-size S.intermedius had reached (58.20 ± 3.03) mm,the body mass had reached (68.43±8.88) g,and the gonadal index had reached 15.38%±1.44%.The shell diameter of the small-size S.intermedius had reached (51.39±2.41) mm,the body mass had reached (53.28±8.71) g,and the gonadal index had reached 13.45%±1.39%.The experimental results showed that according to the seasonal differences in seawater temperature between Fujian and Shandong,S.intermedius sea raft relay aquaculture could greatly improve the growth rate of sea urchins,shorten the breeding cycle,and was an efficient breeding model with good promotion value.Using the north-south relay aquaculture model;choosing large-size S.intermedius seedlings to breed could bring higher economic benefits. Table and Figures | Reference | Related Articles | Metrics

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Nutritional analysis and comprehensive evaluation of by-products of sea cucumber( Apostichopus japonicus) WANG Yangduo, SU Yongchang, WANG Xiaoyan, SHI Wenzheng, LIU Zhiyu Journal of Fisheries Research    2023, 45 (6): 577-584.   DOI: 10.14012/j.cnki.fjsc.2023.06.008 Abstract （94）   HTML （4）    PDF （1080KB）（57）       Knowledge map    Save This article focused on the typical processing by-products of sea cucumber (A.japonicus), including intestines and ovum, to explore their nutritional composition and conduct a comprehensive evaluation by comparing them with body walls. The results showed that the crude protein, crude fat, ash, and total sugar contents in sea cucumber intestines and ovum were 68.85%, 13.53%, 9.96%, 0%,and 58.18%, 12.24%, 19.01%, 2.36%, respectively. In comparison to the body walls, the by-products exhibited higher crude protein and fat contents, but lower ash and total sugar contents. The intestines and ovum were found to contain 18 different amino acids, constituting 68.15% and 51.38% of the total amount, respectively. The ratio of essential to non-essential amino acids was 65.17% and 61.37%, respectively, with essential amino acids accounting for 39.46% and 38.03% of the total amino acids. The essential amino acid index was 94.85 and 67.73, respectively, suggesting that both the intestines and ovum possessed high nutritional value as they exhibited a good balance effect of amino acid components, identifying them as ideal protein sources. The unsaturated fatty acids constituted a similar proportion of total fatty acids, with 80.82% and 80.74%, respectively. Notably, EPA and DHA were the major components of these fatty acids. Additionally, five macro elements and five trace elements were detected, with sodium and iron being the primary elements. This study serves as a foundation for the high-value utilization of sea cucumber by-products and the development of active substances. Table and Figures | Reference | Related Articles | Metrics

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Implications of fish conservation in Tibet from the perspective of gut microbiota PAN Hongbo, LIU Haiping, GUO Mingxiong Journal of Fisheries Research    2023, 45 (4): 385-398.   DOI: 10.14012/j.cnki.fjsc.2023.04.009 Abstract （93）   HTML （3）    PDF （1680KB）（92）       Knowledge map    Save The fish gut microbiota is very diverse, but the information about the type of gut microbiota of different fish is different. Fish live in the water environment, and their gut microbiota is easily affected by factors such as environment, food, and body growth and development. This paper introduced the characteristics and resources of indigenous fish in Tibet, analyzed the composition of gut microbiota of fish, and expounded the main research technical means of fish gut microbiota structure. It could play an important role in the conservation of fish in Tibet. Table and Figures | Reference | Related Articles | Metrics

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Analysis on the differences of four flavor compounds of Cyprinus carpio var. Quanzhounensis under two aquaculture modes HUANG Yin, WEN Luting, DU Xuesong, TIAN Zeyu, LI Zhe, HUANG Bo, WU Xia, LI Qing, QIN Junqi, CHEN Zhong Journal of Fisheries Research    2023, 45 (4): 372-377.   DOI: 10.14012/j.cnki.fjsc.2023.04.007 Abstract （92）   HTML （0）    PDF （1044KB）（76）       Knowledge map    Save In order to study the effect of pond and paddy field cultivation mode on the flavor substances of C.carpio var. Quanzhouensis, headspace solid phase microextraction method was used to detect the contents of E-2-nonenal, 2-methylisothiol (2-MIB), and geosmin (GSM) in muscles and hepatopancreas. The content of hypoxanthine nucleotides (IMP) was determined by high performance liquid chromatography tandem mass spectrometry. The results showed that in terms of earthy smell substances, the contents of 2-methylisoalloxal and geosmin in the muscle of C.carpio var. Quanzhouensis cultured in paddy fields were extremely significantly higher than those in pond cultivation mode, and the contents of e-2-nonenal and geosmin in the hepatopancreas of C.carpio var. Quanzhouensis cultured in paddy fields were extremely higher than those in pond cultivation mode (P<0.01). In terms of umami substances, IMP contents in the muscles of C.carpio var.Quanzhouensis cultured in paddy fields were extremely higher than those in ponds (P<0.01); no significant differences were found in the IMP content of the hepatopancreas. In conclusion, C.carpio var. Quanzhouensis cultured in paddy fields had a higher umami taste, but also a heavier earth odor; C.carpio var. Quanzhouensis cultured in ponds had a weak soil flavor, but umami taste was not strong. Table and Figures | Reference | Related Articles | Metrics

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Histological observation on the gonadal development of the parental Thamnaconus modestus during early reproductive regulation MAO Xintong, LIU Liming, WANG Jiulong, LIU Yan, WU Yanqing, JIANG Hongli, XU Wengang Journal of Fisheries Research    2024, 46 (1): 11-18.   DOI: 10.14012/j.cnki.fjsc.2024.01.002 Abstract （91）   HTML （8）    PDF （2514KB）（133）       Knowledge map    Save This study aimed to understand the gonadal development and reproductive characteristics of the black scraper (T.modestus) before and after spawning.From November 2021 to March 2022,the parent fish were collected for five times,with three males and three females at each time.The total length,body weight,hepatopancreas index and gonadosomatic index were measured every time.At the same time,paraffin-embedded sections and hematoxylin-eosin staining were used to observe the gonadal development.The results showed that under artificial temperature control,the gonad weight and gonadosomatic index of the female and male parental T.modestus reached the maximum in February,and entered the peak period of sexual maturity,which was significantly higher than that in other months (P<0.05),suggesting that the parent fish reached the peak of maturity in February under the condition of artificially controlled water temperature.The spawning type of T.modestus was asynchronous and batch spawning,and the ovarian development of T.modestus could be divided into six phases,which was peri-nucleolus,yolk vesicle,primary yolk,secondary yolk,teritary yolk,and ripe stage,respectively.The testis development of T.odestus could be divided into five phases,which was spermatogonium,primary spermatocyte,secondary spermatocyte,spermatid and spermatozoa,respectively.In conclusion,this study investigated the morphological characteristics,organizational structure and developmental rules at different gonadal development stages of T.modestus,which may enrich the basic data of reproductive biology and provide scientific basis for artificial breeding and seed production of T.modestus. Table and Figures | Reference | Related Articles | Metrics

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Influence of exogenous additives on the gelatinization characteristics and nutritional quality of bay scallop mince( Argopecten irradians) HUANG Sijia, SUN Shiwen, LI Meng Journal of Fisheries Research    2024, 46 (2): 111-120.   DOI: 10.14012/j.cnki.fjsc.2024.02.001 Abstract （90）   HTML （24）    PDF （1393KB）（76）       Knowledge map    Save In order to develop high quality scallop mince products, this paper took frozen Argopecten irradians scallops as the raw material, and selects soybean isolate protein, hydroxypropyl cassava starch, carrageenan, and egg albumen to be added to the A.irradians mince, which explored the effects of exogenous additives on the gelatinization characteristics and nutritional quality of A.irradians mince.The results showed that 5% soybean isolate protein (Group B) and hydroxypropyl cassava starch (Group C) were effective in improving the textural properties when added to A.irradians mince respectively, and the latter was able to significantly improve the water-holding capacity of A.irradians mince products, but 8% egg albumen (Group D) or 0.6% carrageenan (Group E) decreased the hardness, cohesiveness, springiness, and water-holding capacity of A.irradians mince. The combination of exogenous additives (Group F: 7% hydroxypropyl tapioca starch, 1.0% carrageenan,Group G: 8% hydroxypropyl cassava starch+1.5% carrageenan+5% egg albumen+4% soybean isolate protein) had a lesser effect on the fabrication structure of the A.irradians mince and was able to improve the water-holding capacity. Group F A.irradians mince products had higher sensory ratings in terms of flavor, color and histomorphology. The A.irradians mince products from groups C, F and G all had superior amino acid and fatty acid ratios, with significant differences in amino acid composition, and significantly higher unsaturated fatty acid contents than saturated fatty acids. The content of EPA+DHA accounted for 45.04%, 44.74% and 30.87% of the total fatty acids, separately. It could be seen that the type and proportion of exogenous additives significantly affect the gelatinization behavior and nutritional quality of minced scallop meat in A.irradians, providing theoretical data for the subsequent development of scallop mince products with different textural structures and cost levels. Table and Figures | Reference | Related Articles | Metrics

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Fish community structure and the growth performance of Hypophthalmichthys molitrix and Aristichthys nobilis in Jinhu Reservoir,Taining County,Fujian Province HE Meifeng, XIAO Jiulan, LIANG Zhonglian, CUI Lifeng, CHEN Mengyun Journal of Fisheries Research    2023, 45 (5): 462-472.   DOI: 10.14012/j.cnki.fjsc.2023.05.006 Abstract （90）   HTML （4）    PDF （2219KB）（143）       Knowledge map    Save In order to provide basic data for biological control of water quality,to improve of fishery potential and economic benefits,we characterized the fish community and measured growth rates of H.molitrix and A.nobilis in Jinhu Reservoir.Making use of mixed gill nets,a systematic fishery investigation was conducted in Janurary,April,July,and October of 2022,respectively.A total of 32 fish species were collected,belonging to 26 genera,8 families and 3 orders.Cypriniformes was the largest order,which accounted for 75.0%.The ecological type analysis revealed that the community was dominated by carnivorous and omnivorous fish.Four dominant fish species were identified based on the index of relative importance,which were H.molitrix,A.nobilis,Xenocypris microlepis and Culter dabryi dabryi.The growth equation of body length and body mass for H.molitrix,they were Lt=74.52×[1-e-0.26(t+0.35)];Wt=6 925.48×[1-e-0.26(t+0.35)]2.906 9,respectively,and for A.nobilis were Lt= 68.35×[1-e-0.19(t+0.82)];Wt = 5 669.32×[1-e-0.19(t+0.82)]2.973 0,respectively.The highest body mass growth rate for H.molitrix occurred during the age of 1-4,and then decreased gradually,with the growth inflexion points at the age of 3.75.And infection point for A.nobilis was 4.91.As a result,the most appropriate catching age were 4-year-old for H.molitrix and 5-year-old for A.nobilis in order to get the best effect on algal bloom control and economic benefit.The results provided important scientific evidence for rational utilization of H.molitrix and A.nobilis resources and ecological environment restoration in Jinhu Reservoir of Taining,Fujian Province,China. Table and Figures | Reference | Related Articles | Metrics

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Effect of ammonia seawater and 5-HT on the maturation of gametes stripped from Ruditapes philippinarum WU Qisheng, QI Jianfei, LUO Juan, NING Yue, GUO Xiang, LUO Huiyu, ZENG Zhinan Journal of Fisheries Research    2023, 45 (4): 341-345.   DOI: 10.14012/j.cnki.fjsc.2023.04.003 Abstract （89）   HTML （1）    PDF （2261KB）（74）       Knowledge map    Save To construct the artificial breeding method of R.philippinarum, effects of ammonia seawater and 5-hydroxytryptamine (5-HT) on the maturation of gametes were studied by soaking the dissected gametes in vitro. Results showed that immersion with ammonia seawater and 5-HT significantly stimulated the germinal vesicles breakdown in R.philippinarum (P<0.05). However, the fertilization rate of ammonia seawater treatment group was better than that of 5-HT treatment group. The fertilization rate of oocytes treated with 10 μmol/L 5-HT for 60 min was 28.38%. The fertilization rate of oocytes treated with 0.015% ammonia seawater for 60 min was the highest (about 41.28%). Table and Figures | Reference | Related Articles | Metrics

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The effects of different diets on the growth, survival and nutritional composition of Artemia nauplii WU Shuiqing, WU Jianshao, GUO Shaopeng, WEN Ping, QIU Denggao, LI Leibin, LUO Huiyu Journal of Fisheries Research    2024, 46 (1): 29-37.   DOI: 10.14012/j.cnki.fjsc.2024.01.004 Abstract （89）   HTML （4）    PDF （1019KB）（91）       Knowledge map    Save Artemia is an important biological feed for aquatic animals.In this study,Saccharomyces cerevisiae,powder of Chlorella pyenoidosa,and fermented shrimp flake were fed to new hatched Artemia nauplii to evaluate the effects of different diets on the growth,survival,and nutritional composition of Artemia nauplii.Results showed that after 6 days feeding,the fermented shrimp flake feed group had the largest average body length,which were significantly larger than that of the S.cerevisiae group and the powder of C.pyenoidosa group (P<0.05).The survival rate of Artemia nauplii fed with S.cerevisiae was the lowest,but there were no significant differences between the powder of C.pyenoidosa group and the fermented shrimp flake group (P>0.05).After 6 days feeding,the crude protein content of Artemia nauplii significantly increased,but the crude fat content significantly decreased compared to Artemia nauplii (P<0.05).The protein content of Artemia nauplii in the powder of C.pyenoidosa group and the fermented shrimp flakes group was significantly higher than that in the S.cerevisiae group (P<0.05).Furthermore,the highest crude fat content was obtained in Artemia nauplii that were fed with the fermented shrimp flakes.The fermented shrimp flakes group had the highest total amino acid (TAA) content and essential amino acid (EAA) content.All experimental groups contained high levels of eicosapentaenoic acid (EPA),but the docosahexaenoic acid (DHA) was undetectable.The total fatty acid content and polyunsaturated fatty acid content in the fermented shrimp flakes group were significantly higher than those in the powder of C.pyenoidosa group and the S.cerevisiae group (P<0.05).However,the Artemia nauplii fed with powder of C.pyenoidosa had significantly higher high unsaturated fatty acid (HUFA) content and EPA content than the fermented shrimp flakes group as well as the S.cerevisiae group (P<0.05).The outcome of this study provided that fermented shrimp flakes and powder of C.pyenoidosa had advantages in enhancing the nutrition of Artemia,and could be used for Artemia production and nutrient enhancement. Table and Figures | Reference | Related Articles | Metrics

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The community structure and biodiversity of nekton in Xiamen sea area, Fujian Province ZHU Jianxin Journal of Fisheries Research    2024, 46 (1): 69-84.   DOI: 10.14012/j.cnki.fjsc.2024.01.008 Abstract （88）   HTML （8）    PDF （2358KB）（193）       Knowledge map    Save In light of the beam trawl survey conducted in the Xiamen sea area during April (spring) and November (autumn) of 2021,this study delves into an analysis of the community structure and biodiversity of nekton within this marine region.The findings unveiled a diverse array,encompassing 176 nekton species,categorized into 18 orders,71 families,and 124 genera.This encompassed 107 fish species,18 shrimp species,35 crab species,8 Stomatopoda species,and 8 Cephalopoda species.Regarding the quantitative aspects,the recorded biomass and abundance of nekton were determined as 281.40 kg·km-2 and 14.49× 103 ind·km-2,respectively.Notably,marked spatial and temporal variations were observed across the surveyed stations.Specifically,the resource density exhibited notable disparities,with the eastern waters and Tong’an Bay of the Xiamen sea area displaying relatively higher concentrations.Moreover,the resource density in autumn significantly surpassed that in spring.The relative importance index (IRI) highlighted distinct dominant species across the seasons.Parapenaeopsis hardwickii,Parapenaeopsis cultrirostris,and Chiloscyllium plagiosum were dominant during spring,whereas Johnius belengerii and Leiognathus brevirostris took precedence in autumn.These dominant species primarily comprised groups characterized by small individuals,abbreviated life cycles,and comparatively lower nutritional levels.Analysis of nekton indices revealed substantial variability in richness,with relatively significant fluctuations.Conversely,diversity and evenness indices displayed minor alterations.Notably,spring exhibited significantly lower values than autumn,positioning the biodiversity at a moderate level.Furthermore,noteworthy interdecadal alterations in the nekton community structure were evident.Through these observations,this study contributes valuable insights into the dynamic composition,seasonal variations,and structural changes within the nekton community in the Xiamen sea area,offering a comprehensive understanding of its biodiversity and ecological dynamics. Table and Figures | Reference | Related Articles | Metrics

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The research progress on the degradation mechanism of microcystins in water by environmental microbes ZHANG He, XU Wenchang, YUAN Yan, XU Jingyi, MA Yantian Journal of Fisheries Research    2024, 46 (3): 215-227.   DOI: 10.14012/j.jfr.2023125 Abstract （88）   HTML （15）    PDF （968KB）（44）       Knowledge map    Save Over the past few years, the issue of Cyanobacteria bloom pollution has escalated due to the combined impacts of global warming and eutrophication in aquatic systems. This has resulted in the release of toxic microcystins (MCs), posing a significant threat to human health and aquatic ecosystems. Effectively controlling and eliminating MCs from water bodies is a pressing global challenge. Fortunately, prior research has demonstrated that microbial degradation of MCs presents an efficient and environmentally friendly solution. This review explores the production, structure, and toxicity of MCs, with a focus on summarizing global advancements in enzymatic degradation pathways, degradation enzymes, and degradation genes associated with MCs. Additionally, it also analyzes the potential applications of microbial degradation bacteria in the ecological restoration of water bodies. Furthermore, the paper delves into future research directions, including alternative pathways for non-mlr-mediated MCs degradation mechanisms, optimizing the expression of MCs-degrading enzymes, and constructing highly efficient dual-functional degradation bacteria. These perspectives aim to deepen human’s understanding of microbial degradation mechanisms of MCs and provide innovative solutions to address the global challenge of MCs contamination in water bodies. Table and Figures | Reference | Related Articles | Metrics

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Analysis and evaluation of nutritive composition of Epinephelus fuscoguttatus ♀ ×E.polyphekadion ♂ LIU Min, XIE Ruitao, WANG Zhuoduo, ZHANG Haitao, HE Shuqing, SUN Guangwen Journal of Fisheries Research    2023, 45 (5): 496-505.   DOI: 10.14012/j.cnki.fjsc.2023.05.010 Abstract （88）   HTML （2）    PDF （948KB）（209）       Knowledge map    Save In this study,nutritional components in the body and muscle of a new hybrid grouper(E.fuscoguttatus ♀×E.polyphekadion ♂)were tested and analyzed with routine methods,in order to evaluate its nutritive value and offer basic date and theoretical basis for the research of its nutrition and the development of formula feed.The results showed that the ratio of flesh content was 74.31%,the contents of moisture,crude protein,crude fat,crude ash,Ca,and P of fresh body were 71.50%,20.45%,2.45%,2.88%,1.68% and 0.92%,respectively.The contents of moisture,crude protein,crude fat and crude ash of the hybrids’ fresh muscles were 74.60%,20.52%,2.48%and 1.23%,respectively.There were 18 kinds of amino acids in the muscle,including 8 essential amino acids (EAA) for human body and 4 delicious amino acids.The content of EAA was 6.89%,which accounted for 41.67% of the total amino acids.The content of tasty amino acids was 6.31%,which accounted for 38.60% of the total amino acids.The essential amino acid index (EAAI) was 78.21.The composition of EAA conforms to FAO/WHO standards.The proportion of saturated fatty acids (SFA) was 35.56%,and the proportion of polyunsaturated fatty acids (PUFA) was 36.46%.EPA and DHA accounted for 6.55% and 12.53% of the total fatty acids,respectively.10 kinds of mineral elements were detected in the muscle.The content of macro elements in muscle from high to low was K>P>Mg>Na>Ca.Among the trace elements,the content of Fe was the highest and the content of Se was the lowest.To sum up,the hybrid grouper(E.fuscoguttatus ♀×E.polyphekadion ♂)was a kind of high quality economic marine fish with good edible value and nutritive value,worthy of exploitation and utilization. Table and Figures | Reference | Related Articles | Metrics

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A review on factors influencing the distribution and longline CPUE of Xiphias gladius SONG Liming, ZHANG Lingxi, BAO Minhua, SUI Hengshou, LI Bin, ZHANG Min Journal of Fisheries Research    2023, 45 (5): 513-522.   DOI: 10.14012/j.cnki.fjsc.2023.05.012 Abstract （88）   HTML （2）    PDF （994KB）（264）       Knowledge map    Save Understanding the distribution characteristics of X.gladius can provide scientific basis for studying the habitat ecology of X.gladius,resource conservation and improving longline fishing gear.This paper highlights the results of domestic and international research on factors influencing the distribution and longline catch per unit effort (CPUE) of X.gladius,as well as the problems and proposes countermeasures to be taken for further research in the future.The results show that:1) X.gladius perform diurnal vertical movements,with a U-shaped movement pattern according to the changes of dissolved oxygen content in water layer,and generally distribute in the corresponding depth of 8.5-13.3 °C during the day and 23.6-26.2 °C during the night;2) X.gladius migrate to tropical waters for spawning and overwintering,and migrate to temperate waters for feeding; 3) X.gladius congregate in frontal areas and eddy fields;4) moonlight illumination affects the vertical movements of X.gladius,and moon phase may also be related to X.gladius spawning behavior;5) the catch rate of X.gladius in monofilament longline fishing is higher than that in polyfilament longline fishing,and the soaking time is positively correlated with the CPUE of X.gladius; 6) fluorescent rods in fishing gear can improve X.gladius CPUE,and the soaking time of fluorescent rods is positively correlated with X.gladius CPUE.The main shortcomings of the previous studies include:1) insufficient research on the relationship between climatic changes and the habitat change of X.gladius;2) less quantitative research on the effect of lunar illumination on X.gladius activity and the results are not robust;3) insufficient research on the effects of different hook types,hook offset and baits on X.gladius CPUE.The following issues are suggested for future research:1) increasing the testing experiments of TDR and CTD to study the effects of temperature,salinity,chlorophyll a and dissolved oxygen concentrations in different water layers on X.gladius distribution;2) using historical catch statistics and satellite remote sensing data to study the relationship between X.gladius distribution and marine environment in combination with changes in ocean monsoon and trade winds to find out the specific effects of climate change on X.gladius distribution;3) using illuminance meters to measure the illuminance of moonlight and quantitatively study the effects of monthly illuminance of moonlight on the vertical movements of X.gladius and their bait organisms and the spawning behavior of X.gladius; 4) further studying the effects of different hook types,hook offset and different baits on X.gladius CPUE. Table and Figures | Reference | Related Articles | Metrics

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Preliminary study on resource distribution and resource density of sea cucumbers in Pingtan sea area of Fujian Province CAI Jiandi, WU Jianshao, MA Chao, FAN Yilong, LIU Yong, XU Chunyan, LIN Qi, YANG Qiuhua Journal of Fisheries Research    2023, 45 (6): 544-550.   DOI: 10.14012/j.cnki.fjsc.2023.06.004 Abstract （86）   HTML （3）    PDF （2098KB）（86）       Knowledge map    Save This study was performed to explore the distribution and resources of natural sea cucumbers in the inshore aquaculture area in Pingtan District (Fujian Province, China). The study conducted surveys to collect information on species, biology, resource amount, fishing amount, and fishing output value of sea cucumbers in the coastal aquaculture area of Pingtan in April, May, and June 2023. Moreover, the samples of sea cucumbers (n=242) were sampled and used for classification. The results showed that all samples were identified as Apostichopus japonicus. Biological measurement results showed that sea cucumbers collected in April, May, and June reveal average body lengths of (131.7±44.3), (150.1±40.6) and (114.9±28.3) mm, average body weights of (52.2±41.6), (108.3±55.9), (56.1±32.2) g, feeding levels of 3~4, 1~4, and 0~3, respectively. Furthermore, the questionnaire survey results of six fishing boats showed that the average sea cucumber catch per boat in April, May, and June was 1 050.0, 683.3, and 233.3 kg, respectively.This is the first report on the possible existence of a self-propagating population of sea cucumber in Pingtan sea area,which provides information on the resources of sea cucumber in Fujian Province. Table and Figures | Reference | Related Articles | Metrics

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Potential effects of microplastic contamination on muscle tissue metabolism of Katsuwonus pelamis in the Eastern Pacific Ocean WU Lijun, PAN Zhong, LI Weiwen, DAI Xiaojie, HE Weiyi, HUANG Hao, OU Danyun, WANG Lei Journal of Fisheries Research    2024, 46 (1): 49-59.   DOI: 10.14012/j.cnki.fjsc.2024.01.006 Abstract （86）   HTML （4）    PDF （1163KB）（102）       Knowledge map    Save Microplastic pollution is widespread worldwide and can enter organisms by ingestion or inhalation.In this study,an experimental group (with microplastics) and a control group (no microplastics detected) were set up,and a non-targeted metabolomic analysis was performed on K.pelamis muscle tissue from the Eastern Pacific Ocean using liquid chromatography-mass spectrometry to investigate the potential effects of microplastic contamination on their metabolites.The results showed that a total of 34 metabolites were significantly different,of which 19 differential metabolites were up-regulated and 15 differential metabolites were down-regulated.The differential metabolite analysis showed that methylmalonic acid and propionic acid were up-regulated to induce neurological disorders and may be responsible for the abnormal swimming pattern of K.pelamis.The metabolite content of 20-hydroxyarachidonic acid in the metabolites of K.pelamis muscle tissue was significantly upregulated (P=0.003) and the difference multiplier was 6.002-folds.Arachidonic acid metabolism was closely related to hepatic disorders of glycolipid metabolism and its abnormal metabolism may affect disorders of glycolipid metabolism.Malic acid downregulation might put K.pelamis at risk of bacterial infection.In contrast,glycerol-3-phosphate,creatine phosphate and hydroxy cumene glycosides were up-regulated as a self-protective mechanism for K.pelamis in response to microplastic accumulation.Metabolic pathway enrichment analysis showed that different metabolites were mainly enriched in metabolism,bile secretion,propionate metabolism,proximal tubular bicarbonate recycling,ethylbenzene degradation,glycerophospholipid metabolism,and cholesterol metabolism.Among them,cholesterol metabolism and glycerophospholipid metabolism were involved in building biofilms and maintaining the basic life activities of the organism;while ethylbenzene degradation and propionate metabolism were used to alleviate toxicity in vivo;and proximal tubular bicarbonate recycling was responsible for mediating blood pH.The results of the study provided some reference significance for the toxicology of microplastic pollution on marine fish. Table and Figures | Reference | Related Articles | Metrics

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Analysis on morphological indices and discrimination of male and female Eleotris oxycephala CHEN Yushu Journal of Fisheries Research    2023, 45 (4): 346-355.   DOI: 10.14012/j.cnki.fjsc.2023.04.004 Abstract （84）   HTML （0）    PDF （1874KB）（86）       Knowledge map    Save To investigate the morphological differences between male and female E.oxycephala, and improve the breeding efficiency, principal component analysis, R-cluster analysis, stepwise discriminant analysis and T-test were used to analyze 17 direct-measured characteristics and 14 standardized characteristics of 60 wild individuals. The T-test showed that there was a significant difference in size between male and female E.oxycephala individuals, however there was no significant difference in plumpness between male and female individuals. The result of principal component analysis showed that the contribution percentage of the three extracted principal components were 66.989%, 7.803% and 4.901%, respectively, and the cumulative contribution rates reached 79.693%. Standardized characteristics with significant differences of E.oxycephala between male and female populations were selected by R-cluster analysis and stepwise discriminant analysis to establish the sex discriminant equation. The equation was as follows,male:F1=-63.908X1+626.425X2+2 298.275X3+173.546X4 -55.640X5-239.618,female:F2=68.365X1+510.204X2+1 936.135X3+150.444X4 +48.164X5-204.308. The comprehensive discrimination accuracy of male and female individuals was 98.3%. To verify the accuracy of sex discriminant equation, the morphological character data of extra 23 wild E.oxycephala were substituted into the sex discriminant equation, and the comprehensive discriminant accuracy was 82.6%. Table and Figures | Reference | Related Articles | Metrics

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Effect of chitosan oligosaccharides on non-specific immunity of Eriocheir sinensis GAO Yujia, XU Mei, XU Yunshu, XU Tiantian, ZHANG Minna, XU Qingsong Journal of Fisheries Research    2023, 45 (6): 530-536.   DOI: 10.14012/j.cnki.fjsc.2023.06.002 Abstract （80）   HTML （3）    PDF （1838KB）（69）       Knowledge map    Save This study aimed to investigate the effect and mechanism of immune enhancer chitosan oligosaccharides (COS) on non-specific immunity of E.sinensis. A total of 45 crabs (20±2) g with intact appendages and uniform individuals were selected for the experiments, and they were randomly divided into three groups, with fifteen crabs in each group. Each crab was injected with 0.1 mL of COS at concentrations of 0 (control group), 50 and 200 μg·mL-1, respectively. Serum and blood lymphocytes were collected 24 hours later to analyze the changes in immune enzyme activity and immune genes, etc. The results showed that compared with the control group, COS treatment significantly increased the activities of superoxide dismutase, catalase, glutathione peroxidase and lysozyme in the serum of crab, significantly increased the content of nitric oxide, and decreased the content of malondialdehyde in serum. Quantitative real-time PCR results showed that compared with the control group, COS significantly increased the expression of EsToll1, EsToll2, EsMyD88, EsTube, EsPelle and EsDorsal in the Toll signaling pathway, and up-regulated the expression of anti-lipopolysaccharide factors EsALF and EsALF3. These results suggested that COS could improve the non-specific immunity and antioxidant capacity of E.sinensis, activate the Toll signaling pathway, and promote the expression of anti-lipopolysaccharide factors. This study provided theoretical support for the application of COS in E.sinensis. Table and Figures | Reference | Related Articles | Metrics

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A comparative study on the nutrient and fatty acid composition in muscle of Siniperca scherzeri in upstream and downstream area of Yalu River JIANG Xianghui, WANG Xingbing, KOU Lingxiao, WEI Hongxiang, LIU Yong, ZHANG Tao Journal of Fisheries Research    2023, 45 (6): 569-576.   DOI: 10.14012/j.cnki.fjsc.2023.06.007 Abstract （80）   HTML （2）    PDF （1150KB）（61）       Knowledge map    Save To figure out the different nutritional quality of S.scherzeri muscle from different habitats, this study determined and compared the nutritional compositions, as well as fatty acids composition and content of S.scherzeri. The results showed that there was significantly higher crude fat content in the muscle of S.scherzeri in upstream area than that in the muscle of S.scherzeri in downstream area (P<0.05), without significance in content of moisture, crude protein and ash between these two groups (P>0.05). There are 16 kinds of fatty acids in the muscle of S.scherzeri in upstream area and 17 in downstream area. The saturated fatty acids, monounsaturated fatty acids and polyunsaturated fatty acids occupied 35.886%, 34.184% and 29.922% in the muscle of S.scherzeri in upstream area, occupied 34.913%, 34.895% and 30.181% in the muscle of S.scherzeri in downstream area, respectively. And for the composition of fatty acid, the essential fatty acid occupied 11.735%, the ratio of ω-6/ω-3 was 0.919,EPA and DHA was 11.672% in the muscle of S.scherzeri in upstream area. The essential fatty acid occupied 9.571%, the ratio of ω-6/ω-3 was 0.781,EPA and DHA was 12.939% in the muscle of S.scherzeri in downstream area. In conclusion,the nutritive value of fatty acid in the muscle of S.scherzeri in upstream area was better than that of S.scherzeri in downstream area. Table and Figures | Reference | Related Articles | Metrics

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Development of microsatellite markers in Macrobrachium nipponense based on sequencing genotyping LIU Kai, XIE Nan, WANG Yuxi, LIU Xinyi Journal of Fisheries Research    2023, 45 (6): 537-543.   DOI: 10.14012/j.cnki.fjsc.2023.06.003 Abstract （79）   HTML （2）    PDF （1120KB）（55）       Knowledge map    Save The microsatellite sequences were obtained using a simple sequence repeats (SSR) development method without needing a reference genome and were genotyped through sequencing. The ebwt2InDel software was utilized to identify Insertion/Deletion (InDel)-containing sequences from the whole genome sequencing data of two samples. Using MISA software, 111 perfect SSR-containing sequences were obtained from the InDel-containing sequences by eliminating non-SSR-containing sequences. The SSRgenotyper software was then used to analyze the polymorphism of 30 M.nipponrnse samples, successfully genotyping 19 out of the 111 SSR-containing sequences with a genotyping success rate of 17.12%. Successful genotyping was achieved at 19 SSR loci, all exhibiting 3-base repeats ranging from 4 to 6. Among them, the highest proportion of repetitive sequences was observed with the ATC/ATG unit, accounting for six loci (31.58%). Two of the 19 SSR markers had low polymorphism information content, and 17 had moderate polymorphism information content. These 19 microsatellite markers helped to evaluate the genetic parameters of freshwater shrimp populations and develop freshwater shrimp germplasm resources. Table and Figures | Reference | Related Articles | Metrics

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The effect of carotenoids on the body color of Neocaridina denticulata sinensis ZHANG Yuanchang Journal of Fisheries Research    2024, 46 (1): 38-48.   DOI: 10.14012/j.cnki.fjsc.2024.01.005 Abstract （78）   HTML （10）    PDF （2645KB）（64）       Knowledge map    Save To study the effect of carotenoids on the body color of red,yellow and blue strains of N.denticulata sinensis,this study used TLC (thin-layer chromatography) to analyze the main pigment compositions of 3 strains of N.denticulata sinensis.According to the results,the effects of carotenoids on the body color of 3 strains of N.denticulata sinensis were tested.The TLC analysis was used to separate the dermis and extract the pigment of 3 strains of N.denticulata sinensis.The feeding trials were conducted in light and dark,while 300 shrimps from each strain were divided into thirty groups,with three replicates in each group.The control group was fed with basic feed,while the other four groups were fed with basic feed added Spirulina,lutein,natural-astaxanthin and artificial-astaxanthin.The results showed that the pigment substances of red,yellow,and blue strains of N.denticulata sinensis contained β-carotene and astaxanthin;the pigment substances of blue N.denticulata sinensis contained a combination of crustacyanin and astaxanthin.The feeding trials showed that in yellow strain and blue strain,natural-astaxanthin had the most obvious effect on the body color promotion.Under the dark condition,lutein,natural-astaxanthin and artificial-astaxanthin had certain promotion and maintenance effects on the body color of red strain and yellow strain.The four carotenoid additives had no effect on the body color in blue strain.This study provided a theoretical basis for improving body color of N.denticulata sinensis. Table and Figures | Reference | Related Articles | Metrics