渤海南部黄鲫生长与死亡特性的研究

Studies on the Growth and Death Character of Setipinna taty in the South of Bohai Sea

根据1991～1992年大面积调查资料和1984～1986年定点连续观测资料,对渤海南部黄鲫成鱼和幼鱼的生长、死亡及其与生殖、摄食的关系等进行了初步分析与研究,结果表明:渤海南部黄鲫个体体长与体重间呈幂指数增长关系,黄鲫成鱼的生长方程式为:Lt=198.7犤1-e-0.596(t+0.15)犦;Wt=89.6犤1-e-0.596(t+0.15)犦2.675,幼鱼的生长与时间呈直线增长关系。在适温、适盐范围内,黄鲫的生长速度主要与生殖和摄食强度有关。黄鲫生殖后有明显的自然死亡现象,其死亡速度,1龄鱼为雌鱼大于雄鱼,2～3龄鱼且雄鱼大于雌鱼。目前,渤海南部黄鲫成鱼资源已捕捞过度,对幼鱼资源损害严重,应采取措施加以繁殖保护。

This experiment was based on the great area regular successive investigation.The result indicated that the individual length of Setipinna taty in the south of Bohai Sea had a positive relationship with individual weight. The Setipinna taty growth function as follows: Lt=198.7[1-e-0.596(t+0.15)];Wt=89.6[1-e-0.596(t+0.15)]2.675. The young Setipinna taty growth had a straight line increase relationship with time.The growth rate of Setipinna taty was mainly relative to reproduction and prey strength in proper temperature and salt.There was natural death phenomenon after Setipinna taty reproduction.The death rate of the female Setipinna taty was more than the male′s at one age;the male′s was more that the female′s between two and three age.At present,grown-up Setipinna taty resources in the south of Bohai Sea was already over-fished;the young Setipinna taty resources was seriously damaged;so the measure should be taken to protect the resources.