东黄海秋季浮游动物优势种聚集强度与鲐鲹渔场的关系

Aggregated Intensity of Dominant Species of Zooplankton in Autumn in the East China Sea and Yellow Sea

一、前言日本鲐鱼(Pneumatophorus japonicus)和蓝圆鲹(Decaterus maruadsi)是东黄海主要中上层鱼类资源。秋季鲐鲹鱼在黄海南部和东海北部(北纬32°00′—33°30′,东经124°00′—128°30′)以及东海中南部(北纬26°30′—29°00′,东经123°00′—126°00′)形成两个索饵渔场,前者简称为北部渔场,后者简称为南部渔场。为了开发和利用东黄海鲐鲹鱼索饵渔场资源,需要对两渔场鲐鲹鱼资源分布的特点进行研究。根据以往国内外的一些报道,鲐鲹鱼是一类以浮游动物为主食的鱼类,其分布特点往往同浮游动物的分布有密切关系。因此。

Based on materials of 48 samples collected in Sept.—Oct. of 1983 in the northern and southern fishing grounds, this paper studies and eompares the spatial distribution of dominant species of zooplankton in the two fishing grounds. The index of aggregated intensity has been used in the study. In the northern fishing ground, dominant species of zooplankton are less abundant in number and are concentratively distributed with high aggregated intensity.In the southern fishing ground,they are on the contrary. The location and characters of high plankton biomass areas in the northern fishing ground are coinoided with those of mackerel and sead central fishing ground. In the southern fishing ground, the scope of central ground is less concentrated as in the northern fishing ground, and it needs to be expanded in the exploitation of the mackerel and scad seined grounds in autumn in the southern fishing ground.