Yolk immunoglobulin (IgY), a polyclonal antibody, has garnered considerable attention for its role in conferring passive immunity against bacterial and viral diseases. This paper comprehensively reviews the current research on the fundamental structure and physicochemical properties of IgY. Additionally, the paper emphasize the diverse applications of IgY in preventing and treating bacterial and viral diseases, offering valuable insights for future research and the broader utilization of IgY in aquaculture.

During the last decade of the 20^th century,the artificial breeding of Larimichthys crocea accomplished its industrialization in China.Since then,the breeding scale and industrial division of the L.crocea industry have been continuously upgraded,forming a perfected industrial chain covering supplying the fishery necessities(fry,feeding stuff,facilities,etc.) and acquisition,trade,processing and export of the marketable fish.The supporting industries such as logistics,catering and tourism have also been gradually formed.In this report,industry experts and practitioners organized by the L.crocea branch of the China Fisheries Association conducted a comprehensive investigation of China’s L.crocea industry status in 2020,then summarized and analyzed it from ten aspects:seedling breeding,farm distribution and output,feeding stuff usage,major epidemic diseases,quality and safety,yields and market,Corona Virus Disease-19 impact,brand culture construction,supporting policies,financial and insurance services,and existing problems;gived countermeasures and suggestions on the industrial development for reference.The survey results showed that there were some problems in the development of L.crocea industry in China,such as low coverage rate of fine varieties,illegal drug use,low level of intensive and deep processing. Suggestions were put forward to promote the healthy and sustainable development of L.crocea industry in China by vigorously developing seed industry projects,standardizing industrial behaviors,increasing the proportion of medium-sized products,improving the processing rate,winning government support and creating industrial culture.

Based on the 1995—2014 global Cololabis saira catch data collected by North Pacific Fisheries Commission，sea surface temperature (SST) and sea surface temperature anomaly (SSTA) of the Kuroshio Oyashio and Kuroshio-Oyashio Transition Zone from the website of Hawaii University, this paper analyzed the relationship between C. saira resource abundance and SST and SSTA of the Kuroshio, Oyashio and Kuroshio-Oyashio Transition Zone by using the method of grey relation analysis and frequency statistic. The results indicated that the inter-annual variation of C. saira dramatically presented an “on and off-year” phenomenon. The correlation of temperature factor in each month and the saury resource abundance correlation was high and all above 0.6, the order was in turn: SSTAKC1＞SSTAOC7＞SSTAOC9＞SSTATZ6＞SSTATZ5＞SSTATZ4＞SSTAOC8＞SSTAKC2＞SSTOC9＞SSTKC3＞SSTKC2＞SSTTZ6＞SSTTZ5＞SSTOC8＞SSTKC1＞SSTTZ4＞SSTOC7＞SSTAKC3, and SSTA correlation degree was generally higher than that of SST. The optimum range of SSTA and SST were 0～1.5℃ and 14～20℃, respectively. According to K-S test (P<0.01), the range of SSTA and SST were reasonable. The research content could help the Chinese mainland master saury resource abundance abnormal changes ahead of time, which helps to arrange fishing effort reasonably.