闽南-台湾浅滩渔场中上层趋光鱼类群聚的空间结构

SPATIAL STRUCTURE OF THE PELAGIC PHOTOTACTIC FISH COMMUNITIES IN SOUTH FUJIAN AND TAIWAN BANK FISHING GROUND

据厦门市机帆船光诱围网渔业1975—1978年31090网次生产纪录,1973—1980年的生产统计资料,探讨了该群聚优势鱼种和资源量指标值的空间分布及优势鱼种的交替。

According to the production records of 31090 tawlings by light fishing on motor sailing seiners of Xiamen from 1975—1978,and the production statistics from 1973—1980,studies were made on the spatial structure of the pelagic phototactie fish communities by taking the production activities as prossess of randamly sampling in the fish community,and the fish composition and its amount in all areas as a community.Spearmen correlation coefficient in order,the diversity index,evenness and standard values of the resources in the community were analysed.The results show that the spatial structure of the pelagic phototaetic fish community,in the South Fujian and Taiwan Bank fishing ground has several characters as follows:1.Each dominant fish species has its distributing centre,instead of random distribution.The distributing centres of most species in this community are in the south of the fishing ground.2.In this community,there are two groups totally in different species camposition.3.The biomass in the community is hight both in the south and north areas.The stability and stock resources of the community is higher in the south of the fishing ground.4.The dominant species in the community show marked alternation temporally.