| 摘要: |
| 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。 |
| 关键词: 渔业生物学 经济鱼类 底拖网 渔业资源评估 东海区 |
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| 基金项目:国家重点基础研究发展规划项目(G19990437) |
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| A preliminary study on fishery biology of main commercial fishes surveyed from the bottom trawl fisheries in the East China Sea |
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| Abstract: |
| On the basis of the bottom trawl 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. Parameters, such as von-Bertalanffy growth parameters, total mortality,natural mortality, fishing mortality and exploitation 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 species, 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 0.5 to 0.7 were in lower over exploitation. In order to sustainable utilization of fishery resources,effective protection and management measures should be taken. |
| Key words: fisheries biology commercial fishes bottom trawl evaluation of fisheries resources East China Sea |
