东海区底拖网渔业主要经济鱼类渔业生物学的初步研究

A preliminary study on fishery biology of main commercial fishes surveyed from the bottom trawl fisheries in the East China Sea

根据1997～2000年东海区底拖网渔业资源调查资料，分析了18种主要经济鱼类的渔业生物学特征，运用体长频率法估算了von Bertalanffy生长参数、总死亡系数、自然死亡系数、捕捞死亡系数和开发率。结果表明，大部分鱼类已出现个体小型化，15种鱼类的开发率过高，处于超额开发状态，其中，4种为重度超额开发，开发率大于0．8，7种为中度超额开发，开发率介于0．7～0．8之间，4种为轻度超额开发，开发率为0．5～0．7。建议加强保护和管理，以利于鱼类资源的可持续利用。

On the basis of the bottom lrawl fishery resources investigation in the East China Sea in 1997～2000, this paper analyzed the fishery biological characteristics of 18 species of main commercial fishes, Parame ters, such as yon Bertalanffy growth parameters, total mortality, natural mortality, fishing mortality and ex ploitation rates, were estimated by length-based methods. The results showed that, miniaturization occurred in most of the fishes, and the exploitation rates of 15 species were excessively high. Among those fishes, 4 spe eies, whose exploitation rates were more than 0. 8, were in high over exploitation 7 species, whose rates ranged from 0, 7 to 0.8, were in middle over exploitation; and the other 4 species ranged from O. 5 to 0, 7 were in lower over exploitation. In order to sustainable utilization of fishery resources, effective protection and man agement measures should be taken.