Mesh size selectivity of the gillnet in East China Sea

[摘要] A production test using several gillnets with various mesh sizes was carried out to discover the selectivity of gillnets in the East China Sea. The result showed that the composition of the catch species was synthetically affected by panel height and mesh size. The bycatch species of the 10-m nets were more than those of the 6-m nets. For target species, the effect of panel height on juvenile fish was ambiguous, but the number of juvenile fish declined quickly with the increase in mesh size. According to model deviance (D) and Akaike's information criterion, the bi-normal model provided the best fit for small yellow croaker (Larimichthy polyactis), and the relative retention was 0.2 and 1, respectively. For Chelidonichthys spinosus, the log-normal was the best model; the right tilt of the selectivity curve was obvious and well coincided with the original data. The contact population of small yellow croaker showed a bi-normal distribution, and body lengths ranged from 95 to 215 mm. The contact population of C. spinosus showed a normal distribution, and the body lengths ranged from 95 to 205 mm. These results can provide references for coastal fishery management.

[发布机构] Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation, Ministry of Agriculture, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai; 200090, China^1;Engineering Technology Research Center of Marine Fishing, Chinese Academy of Fishery Sciences, Shanghai; 200090, China^2;Marine and Fisheries Research Institute in Jiangsu Province, Nantong; 226007, China^3

[效力级别] 生物科学

[关键词] Akaike's information criterions;Coastal fisheries;East China Sea;Juvenile fish;Normal model;Production test;Relative retention;Target species