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本研究以东海区历年渔业资源监测调查数据为依据,对带鱼和小黄鱼的群体结构、生物学参数、摄食习性和繁殖习性等渔业生物学动态进行了分析。结果表明,目前东海区带鱼和小黄鱼种群的个体小型化现象相当突出,渐近长度L∞随着时间的推移呈现下降趋势,而生长参数K以及总死亡系数Z和捕捞死亡系数F却呈现逐渐增大趋势。摄食习性和繁殖习性亦发生了较大的变化,带鱼表现出极强的自食性,小黄鱼主要摄食种类与过去大不相同;性成熟提前,同年龄、同一体长组的带鱼和小黄鱼个体平均绝对繁殖力提高。产生这些变化的最主要原因是捕捞的影响和鱼类自身适应自然的结果。
Based on the survey data of fishery resources monitoring in the past years in the East China Sea, this study analyzed the population dynamics of the fishery such as population structure, biological parameters, feeding habits and breeding habits of octopus and small yellow croaker. The results showed that the individual miniaturization of octopus and small yellow croaker population in the East China Sea was quite prominent. The asymptotic length L∞ showed a decreasing trend with time, but the growth parameters K, total mortality Z and fishing mortality F gradually increased Trend. Feeding habits and breeding habits have also undergone major changes, the octopus showed a very strong self-feeding, the main feeding species of small yellow croaker and the past is not the same; sexual maturity in advance, the same age, same length group of fish and small yellow croaker individual average absolute Fecundity increased. The main reason for these changes is the impact of fishing and the natural adaptation of the fish themselves.