Changes of biological characteristics of small yellow croaker(Larimichthys polyactis) in the central and southern Yellow Sea
Changes of biological characteristics of small yellow croaker(Larimichthys polyactis) in the central and southern Yellow Sea
复制标题
作者：
Dai Fang-qun
根据1960年、1985年、1998年和2008年在黄海中南部进行的底拖网调查，分析了小黄鱼（Larimichthys polyactis）种群结构和生物参数的年变化，并采用灰色关联分析方法研究了海水温度、渔船功率和饵料强度变化对小黄鱼种群结构和生物参数的影响。结果表明，近40年来，小黄鱼的生物学参数发生了很大的变化。渔获个体尺寸变小，种群结构简单，生长速度加快，渐近长度和重量拐点减小。总死亡率、自然死亡率和捕捞死亡率均呈上升趋势。与生物参数的灰色关联度分别为0.7238（渔船动力）、0.6903（胃饱度）和0.6396（温度），表明捕捞活动对生物参数的年代际变化影响最大。
Based on the bottom trawl survey in the central and southern Yellow Sea in 1960,1985,1998 and 2008,the decadal changes in population structure and biological parameters of the small yellow croaker Larimichthys polyactis were analyzed,and the gray correlative analysis was used to study the effects of changes in sea water temperature,power of fishing boats and the feeding intensity on the biological parameters.The result showed that a great change had happened in the biological parameters of small yellow croaker during past four decades.The size of individuals from the catch has become smaller and population structure become simple,while the growth speed increased,asymptotic length and the inflexion of weight decreased.The total mortality,natural mortality and fishing mortality were found to have an increasing trend.The gray relationship degrees were 0.7238(power of fishing boats),0.6903(stomach fullness),0.6396(temperature) with biological parameters,suggesting that the fishing imposed the strongest impact on decadal changes of the biological parameters.