Spatiotemporal variations of pelagic fishery resources in East China Sea
东海区中上层鱼类资源的时空分异

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.