南海北部龙头鱼流刺网渔获组成初步分析

Preliminary analysis on catch composition of gillnet fishery for Harpodon nehereus in north part of the South China Sea

为了获取南海北部龙头鱼流刺网的渔获组成、主要种类的生物学特征、幼鱼比例等数据。2012年9月在珠海近海渔场进行了调查研究。结果表明，龙头鱼流刺网的优势渔获种类为龙头鱼（Harpodonnehereus）、杜氏叫姑鱼（Johniusdussumwri）、金色小沙丁鱼（Sardinellaaurita）和鳓（Ilisha elongata），其相对重要性指数（IRI）分别为11831．24、2118．43、1154．70和1118．87，优势体（叉）长组分别为201～200、131～150、151～160、161～180mm。建议尽快制定出南海区龙头鱼的最佳开捕体长，以促进龙头鱼流刺网渔业的可持续发展。

In order to obtain catch composition, the biological character of main species and the percentage of immature fish, survey of gillnet fishery for Harpodon nehereus was conducted September 2012 in north part of the South China Sea. The result indicated that the dominant species of the gillnet fishery were Harpodon nehereus, Johnius dussumieri, SardineUa aurita and llisha elongata. Their IRI were 11 831.24, 2 118.43, 1 154.70 and 1 118.87, respectively; and their dominant groups of body length were 201-200 mm, 131-150 mm, 151-160 mm and 161-180 mm, respectively. Finally, in order to obtain a sustainable gillnet fishery for H. rtehereu~, the optimum first capture standard length of H. nehereus was suggested to be promulgated.