南海北部大陆架底层鱼类资源密度概率分布型的研究

本文把底层鱼类资源密度看成是海洋生态系整体系统的一个组成成份。应用柯尔莫哥洛夫假设拟合优度检验,系统分析了近两周年(二十三个月)共1,445网次的“南海北部大陆架底层鱼类资源调查”的综合渔获量资料。发现理论的对数正态分布完全符合观察的频率分布,二十三个月无一例外。因而,得出了该海域底层鱼类的渔获密度服从对数正态分布型这个初步结论。在此基础上,进一步推证了资源密度同样服从对数正态分布型。这一发现,为研究该海域底层鱼类的数量分布提供了一个确当的随机性模型。

THE PATTERN OF PROBABILITY DISTRIBUTION ON THE DENSITY OF DEMERSAL FISHES STOCK IN THE NORTHERN CONTINENTAL SHELF OF THE SOUTH CHINA SEA

In this paper the density of the demersal fish stock was considered as a compoent part of whole marine ecosystem. The data of fish caught were accumu-lated for about two years (23 monthe) and with 1,445 hauls. Materials were system-atically analysed by means of kolmogorov test of goodness fit hypothesis. It was foundthat frequency of distribution was closely related with the theoretical lognormal distri-bution. so we came to the primary conclusion that the index of catch density of thedemersal fish stock followed lognormal distribution. On this basis, we further deducedthat the stock density fillowed lognormal distribution as well. This discovery provideda suitable stochastic model for the study of quantitative distribution of the demersalfishes in the sea area.