渔获群体组成分析是水产资源研究的基本内容之一。渔获群体组成变化是衡量资源变动的一个重要指标。众所周知,我们常常分析年序渔获群体组成是否小型化并以此作为该渔获对象资源是否利用过度或资源衰退的指数。如带鱼渔获个体小型化反映了带鱼资源利用过度,大黄鱼渔获个体小型化反映了捕捞力量大于最适捕捞力量、单位努力渔获量及群体资源量下降等等。但是,目前大都是利用生物学统计方法,从均值(平均体重、体长)变化、“小型鱼”体长或体重 The analysis of catch population composition is one of the basic contents of aquatic resources research. Changes in catch composition are an important indicator of changes in resources. It is well-known that we often analyze whether the composition of the annual catch population is miniaturized and use it as an indicator of whether the catchment resource is over-utilized or resource-depleted. For example, the miniaturization of hairtail fishing reflects the over utilization of hairtail resources. The miniaturization of big yellow croaker fishing reflects that the fishing power is greater than the optimum fishing power, the unit effort catches and the decline of the population resources, and so on. However, at present, most of them make use of biological statistical methods, and mean (average body weight, body length) changes, “small fish” body length or weight