Catching Performance of Combination of Square and Diamond Mesh Codend of Trawl in the Northern Part of South China Sea
YAN Lei1,2, YANG Bingzhong2,3, LI Yanan2,3
1. South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China; 2. Key Laboratory of Open-Sea Fishery Resources Exploitation & Utilization Development, Ministry of Agriculture and Rural Affairs, Guangzhou 510300, China; 3. College of Animal Science & Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
Abstract：In order to evaluate the mesh selectivity of combination of square and diamond mesh codend for the main catches of trawl in the northern South China Sea, the captive selectivity was comparatively investigated in combined mesh codend (treatment net group) and traditional-diamond mesh codend (control net group) using the covered net method, and the selectivity curves were fitted with Logistic and Richards curves to analyze the selectivity performance of 2 different mesh structure codends for blue round scad Decapterus maruadsi in the northern South China Sea. The results showed that there were eight species with number escape rate and biomass escape rate higher than 80% in the treatment net group, while there were only five species in the control net group. As the highest quality catch species in the two mesh codends, the number escape rate and mass escape rate of blue round scad were found to be 25.35% and 20.98% in the treatment net group, and 16.39% and 15.48% in the control net group, respectively. The selectivity showed that the Richards curves of the two nets were better fitted, with smaller model residuals and Akaike's information index (AIC values), and the 50% retention lengths (L50) for blue round scad were 14.31 cm and 13.60 cm, respectively. In summary, there were higher escape rates in the reatment net for a variety of bycatch. The findings indicated that application of the combined square and diamond mesh codend effectively improved the trawl selectivity and protected the sustainable use of fishery resources.
晏磊, 杨炳忠, 李亚男. 南海北部拖网方形和菱形混合网目网囊的渔获性能研究[J]. 水产科学, 2023, 42(4): 690-697.
YAN Lei, YANG Bingzhong, LI Yanan. Catching Performance of Combination of Square and Diamond Mesh Codend of Trawl in the Northern Part of South China Sea. 水产科学, 2023, 42(4): 690-697.
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2023, Vol. 42 
