摘要
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。
Based on the bottom trawl surveys in four seasons from 2006 to 2007 inside bottom-trawl fishing forbidden zone line of Jiangsu sea area and the near zone,we explored the temporal and spatial distributions of Larimichthys polyactis Bleeker resources in this target area,as well as their mechanism.The results showed that：（1） spawning and feeding groups in offshore areas of Jiangsu Province were composed of South Yellow Sea population mainly,with East China Sea population and smaller Yellow-Bohai Sea population;（2） the biomass of Larimichthys polyactis Bleeker was higher in spring and summer,with the highest in summer,and decreased following the order of spring,autumn and winter;（3） the distribution areas extended to north gradually with seasons,and the move tendency was obvious from autumn to winter;（4） in the radiating sand ridge and the surrounding regions,total average biomass of Larimichthys polyactis Bleeker in a year was much higher than that in the north-central area of the offshore areas of Jiangsu Province,while an opposite tendency was found in winter;（5） there was a stable group composed of South Yellow Sea population and East China Sea population in some areas near the south of Yangtze River estuary all through the four seasons;（6） the groups reaching the stage of sexual maturation migrated to the target area,spawning and hatching in spring,and there was a high group density of juveniles in summer,nevertheless,there was a dispersing tendency of juvenile groups gradually as the target area was not a stable feeding ground.
出处
《水产学报》
CAS
CSCD
北大核心
2011年第2期238-246,共9页
Journal of Fisheries of China
基金
国家908专项(JS-908-01-01
JS-908-02-08)
国家科技支撑计划(2007BAD43B01)
关键词
小黄鱼
资源群体
地理种群
禁渔区线内侧
时空分布
江苏近岸
Larimichthys polyactis Bleeker
resource group
geographical population
inside bottom-trawl fishing forbidden zone line
temporal and spatial distribution
offshore areas of Jiangsu Province
