东海区中上层鱼类资源的时空分异

根据渔业区划中东海区的地理水文特点,将东海区划分为地理上的3个区域,即黄海中南部、长江口和东海中南部。据1987～1998年东海区上海、宁波、江苏、舟山四大渔业公司中上层鱼类渔捞数据,以渔获量和平均网产为指标,分析了东海区中上层鱼类资源的季节性特性和时空分布特征。最后利用空间趋势面拟合方法,分析东海区中上层鱼类资源的区域分异特征。结果显示,不同海区的中上层鱼类资源大致具有自西南向东北或者自西向东减少的趋势,与该区主要海流相对应。

Spatiotemporal variations of pelagic fishery resources in East China Sea

The research area is divided into three sub-areas,i.e.central south area of the Yellow Sea,mouth area of the Changjiang River and central south area of the East China Sea,according to their hydrographical characters.Capture data of pelagic fishes in the research area collected from four major fishery companies were used to analyse the spatiotemporal variations of pelagic fishery resources in this region.The fishing season of central south area of the Yellow Sea lasts from autumn to winter.It is autumn in the mouth area of the Changjiang River and summer in the central south area of the East China Sea.It was found by trend surface analysis that the average annual seine yield,which was taken as an indicator of the fishery resources,showed a general decreasing tendency from west by south to east by north or west to east,depending on different sub-areas.Primary biomass,ocean current and temperature pattern were thought to be mainly responsible for it.