Effects of Trawl Selectivity and Genetic Parameters on Fish Body Length Under Long-Term Trawling  

作　　者：YU Yang SUN Peng CUI He SHENG Huaxiang ZHAO Fenfang TANG Yanli CHEN Zelin 

机构地区：[1]College of Environmental Science and Engineering, Ocean University of China [2]Fisheries College, Ocean University of China [3]Chinese Academy of fishery sciences

出　　处：《Journal of Ocean University of China》2015年第5期835-840,共6页中国海洋大学学报（英文版）

基　　金：financial support from the National Natural Science Foundation of China(No.31402 350);Special Fund for Agro-scientific Research in the Public Interest(No.201203018)

摘　　要：Long-term fishing pressure affects the biological characteristics of exploited fish stocks. The biological characteristics of hairtail(Trichiurus lepturus) in the East China Sea are unable to recover because of long-term trawling. Fishing induces evolutionary effects on the fish's biological characteristics. Evidence of these changes includes small size at age, a shift to earlier age structure, and early maturation. Natural and artificial selection usually affect the fish's life history. Selection can induce different chances of reproduction, and individual fish can give a different genetic contribution to the next generation. In this study, analysis of time-dependent probability of significance and test of sensitivity were used to explore the effects of fish exploitation rate, mesh size, and heritability with long-term trawling. Results showed that fishing parameters were important drivers to exploited fish population. However, genetic traits altered by fishing were slow, and the changes in biological characteristics were weaker than those caused by fishing selection. Exploitation rate and mesh size exhibited similar evolutionary trend tendency under long-term fishing. The time-dependent probability of significance trend showed a gradual growth and tended to be stable. Therefore, the direction of fishing-induced evolution and successful management of fish species require considerable attention to contribute to sustainable fisheries in China.Long-term fishing pressure affects the biological characteristics of exploited fish stocks. The biological characteristics of hairtail （Trichiurus lepturus） in the East China Sea are unable to recover because of long-term trawling. Fishing induces evolutionary effects on the fish＇s biological characteristics. Evidence of these changes includes small size at age, a shift to earlier age structure, and early maturation. Natural and artificial selection usually affect the fish＇s life history. Selection can induce different chances of reproduction, and individual fish can give a different genetic contribution to the next generation. In this study, analysis of time-dependent probability of significance and test of sensitivity were used to explore the effects of fish exploitation rate, mesh size, and heritability with long-term trawling. Results showed that fishing parameters were important drivers to exploited fish population. However, genetic traits altered by fishing were slow, and the changes in biological characteristics were weaker than those caused by fishing selection. Exploitation rate and mesh size exhibited similar evolutionary trend tendency under long-term fishing. The time-dependent probability of significance trend showed a gradual growth and tended to be stable. Therefore, the direction of fish- ing-induced evolution and successful management of fish species require considerable attention to contribute to sustainable fisheries in China.

关 键 词：trawling pressure fish biological characteristics fishery management 

分 类 号：S973.23[农业科学—捕捞与储运]