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根据2006-2007年4个季度机轮底拖网禁渔区线内侧及毗邻海域拖网专项调查数据,研究目标区内小黄鱼资源时空分布特征及相关规律。(1)江苏近岸海域小黄鱼产卵、索饵群体以南黄海群为主,东海群为次,黄渤海群影响甚微;(2)小黄鱼生物量高发生期为春、夏两季,夏季大幅高于春季,秋季高于冬季;(3)分布区随季节推移总体呈现北延趋势,而秋季至冬季北移迹象明显;(4)全年总体发生量,中南部的辐射沙脊群及邻近区域远高于中北部区域,但冬季则相反;(5)近长江口南部局部区域为南黄海群和东海群种群组成的混栖群体,四个季节生物密度稳定;(6)趋于性成熟群体春季陆续洄游至目标区产卵、孵化,幼体夏季在目标区出现较密集分布,但随时间推移幼鱼群体呈逐步分散趋势,目标区不是稳定的索饵场。
According to the special survey data of trawling inside and outside the fishing line of the bottom trawler in the four quarters of 2006-2007, the spatio-temporal distribution of small yellow croaker resources in the target area and the related laws were studied. (1) The small yellow croaker spawned in the coastal area of Jiangsu Province, mainly in the south of the Yellow Sea, while the East Sea Group was the second in the Yellow Sea and Bohai Sea Group. (2) The high biomass of the yellow croaker occurred in spring and summer and summer Significantly higher than those in spring and autumn, and higher in winter than in winter. (3) The distribution area showed an overall northward trend with seasonal changes and obvious signs of a northward move from autumn to winter. (4) Annual occurrence, radiant sand ridges in central and southern China, (5) The southern part of the Yangtze River estuary near the southern Yellow Sea and East China Sea population groups of mixed habitats, four seasons biological density and stability; (6) tends to be Mature groups migrated to the target area to spawn and hatch again in the spring, and juvenile larvae appeared more densely distributed in the target area in summer. However, the larvae showed a gradually dispersed trend over time, and the target area was not a stable feeding site.