东海区龙头鱼数量分布与渔业生物学现状分析

以2008-2009年东海区渔业资源大面积定点底拖网调查资料和常规渔业资源监测资料为依据,对龙头鱼的渔业生物学特征进行了分析研究。结果表明：龙头鱼主要分布在江苏外海和长江口外海,较为稳定的盐度水域范围,对水温和水深的适应范围较广;龙头鱼的优势叉长为120～200 mm,占70.55%,平均叉长165.23 mm;优势体重为10～20 g,占28.21%,平均体重34.10 g。龙头鱼的雌雄比例约为1.70：1,7-9月为产卵盛期;除了7月份以外,龙头鱼摄食等级为0级（空胃）所占比例最高;食性分析结果表明,胃含物中出现频率最高的是龙头鱼,其次为七星底灯鱼,再次为中国毛虾。目前,龙头鱼尚属于资源状况较好的鱼种之一,渔获量较为稳定,资源开发尚有一定潜力。

Analysis of the Current Situation of Fishery Biology of Harpodon nehereus in the East China Sea

Based on the fishery resource survey date fishery resource monitor date between 2008 and 2009, were studied. The results showed that the H. nehereus of bottom trawl in the East China Sea and the routine the fishery biology characters of Harpodon nehereus distributed mostly in the outer sea area of Jiangsu province and in the outer sea area of Changjiang estuary. In the distributing area, the salinity was steady the temperature and the deep of the water were extensive. The dominate fork length of the H. nehereus ranged from 120 mm to 200 mm, accounting for 70.55% and the average fork length was 165.23 mm. The dominate weight ranged from 10 g to 20 g, accounting for 28.21% and the average weight was 34.10 g. The ratio of male to female was 1.70： 1, the flourishing period of the H. nehereus was from July to September. The dominate feeding intensity was 0 except in July, and the results on feeding habits study indicated the H. nehereus ap- peared in the stomach content with high frequency, next was the Benthosema pterotum, then Acetes chinensis. At present, the status of fishery resource on H. nehereus was better, and the quantity of fishing was stabiliza- tion, so the resource exploitation was potential.