In September 2021,the goldfish (C.auratus) cultured at two adjacent ornamental fish farms in Tongzhou District of Beijing suffered from sporidiosis,and displayed dorsolateral humps or swollen abdomen,which lost their ornamental value and caused a small number of deaths.In order to identify the specie of parasite and enrich its epidemiological data,the lesion tissues from dorsolateral humps and hepatopancreas of diseased fish were collected.Morphological observation and spores measurement were carried out.18S rDNA gene of the parasites was then cloned,sequenced and analyzed.The results showed that the morphological characteristics of the spore was pyriform in shape,and two polar capsules arranged in an octagonal shape at the front which accounts for about half of the entire length of the spore.The measured data of the spores were 17.58 μm and 18.09 μm in average length,11.02 μm and 11.82 μm in average width,and there were 7-9 loops of polar filaments,which were similar to those of M.wulii. The partial sequences of 18S rDNA gene of the parasites had the highest homology with M.wulii based on blast from GenBank,and the similarity was more than 99%.In addition,in the constructed phylogenetic tree by 18S DNA gene,the isolated spore was also clustered with the M.wulii.Therefore,it was confirmed that the parasites caused goldfish sporidiosis in these two cases were both M.wulii,and this was the first report that M.wulii parasitized in goldfish muscle.

Deeper offshore aquaculture plays a crucial role in mitigating the ecological pressures in nearshore waters, expanding the aquaculture industry’s development space, and offering high-quality green aquatic products. In Fujian Province, the deeper offshore aquaculture is still in its early stages, and it has introduced the “Fujian Province Pilot Work Plan (2021—2023) For Deepsea Equipment Breeding Project” to research and tackle the technological challenges related to this industry. The plan aims to establish a complete industry chain, enhance the industrial service system, and explore novel fields, mechanisms, and models for deeper offshore aquaculture. This paper is centered around the developmental requirements of the deep-sea aquaculture industry and follows a problem-oriented approach. It presents an industry development service system for deeper offshore aquaculture that consists of three main links and six systems,including infrastructure construction services and financial support services during the pre-production stage, production technology services and industrial supply chain services during the mid-production stage, and brand building services and processing and circulation services during the post-production stage. Moreover, it provides strategies and suggestions for constructing a service system, aiming to establish a comprehensive support system that enables the sustainable development of the deep-sea aquaculture industry.

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.

Global warming threatens human survival and social development. Reducing the content of greenhouse gases such as carbon dioxide in the atmosphere and developing a low-carbon economy have become the consensus of all countries in the world. Carbon sequestration fishery is of great and practical significance to the development of low-carbon economy. Carbon sequestration fishery will become the driving force of a new round of fishery development. This paper first expounded the concept and mechanism of carbon sequestration and carbon sequestration fisheries. Based on the field investigation of various breeding enterprises and marine pastures in Zhanhua District, Wudi County and Beihai Economic Development Zone of Binzhou City,this paper collected the relevant data of shellfish, algae, fish and shrimp fisheries in Binzhou City in recent years, and then analyzed the current situation of the development of carbon sequestration fisheries in Binzhou City from the aspects of resources, breeding mode, marine pastures and resource restoration. This paper expounded the problems existing in the development of carbon sequestration fisheries, and finally put forward feasible suggestions for the development of carbon sequestration fisheries from the perspective of the government.