马鲛体型特征与网目尺寸关系的初步探讨

Relationship between body characteristic of Scomberomorus and the mesh size

摘要: 初步探讨了马鲛流刺网网目尺寸与其主捕对象康氏马鲛（Scomberomorus commersoni）体型特征的关系。在对南海北部进行了2个航次的海上调查的基础上，分析了马鲛流刺网的捕获种类、康氏马鲛的体型特征等，结合网具的捕获方式，用相对体围值分析了康氏马鲛体型特征与网目尺寸的关系。结果显示，渔获种类有22种；康氏马鲛占渔获总产量的57.33%；康氏马鲛捕获位置在鳃盖骨后缘至第二背鳍起点之间；捕获的康氏马鲛相对体围值范围为0.96~1.77，相对体围值为1.09时捕获量最大。

Abstract: We conducted two gillnet fishery surveys in northern South China Sea in 2012 to investigate the relationship between the body characteristics of Scomberomorus commersoni and the mesh size. The captured species and the body characteristic of S.commersoni are analyzed, and the relationship between the body characteristic of S.commersoni and the mesh size is investigated by the relative body girth, according to the captured way. The results indicate: there are 22 catch species; S.commersoni accounts for 57.33% to the total landing; the captured position in body of S.commersoni is between opercula and the beginning of the second dorsal fin. The relative body girth ratio of S.commersoni lies in the range of 0.96~1.77, while the relative body girth ratio 1.09 is optimum for S.commersoni catch.