应用体长结构VPA评估东海西部日本鲭种群资源量

Assessment on the biomass of Scomber japonicus resources in the western East China Sea by length-structure VPAYAN

中文关键词: 东海西部日本鲭种群  体长结构VPA  资源量  最大持续产量  年龄结构

英文关键词: Scomber japonicus of the western East China Sea populations  Length-structure VPA  Resources biomass  Maaximum sustainable yield  Age structure

中文摘要:

      为了摸清东、黄海日本鲭的资源量和渔业利用状况，以2007年5～12月在东海近海和黄海中南部海域渔获的日本鲭叉长的测定数据为基础材料，结合东、黄海区的渔业产量统计资料，应用体长结构实际种群分析法（VPA）估算了2007年东海西部日本鲭种群的资源量，并分析了该资源的结构和利用程度。结果表明，中国利用东海西部日本鲭种群的年龄结构以当年生幼鱼（31.87%）和1龄鱼（49.90%）为主，现存年平均资源尾数和资源量分别为3.68×10⁹ N和39.55×10⁴ t；该资源的利用程度处于中度偏低开发状态，最大持续产量（MSY）为24.08×10⁴ t，年渔获量已超过MSY，进一步开发利用的潜力不大；禁止利用当年生的幼鱼，能使资源处于更佳状态。通过分析该资源的渔业利用时间和年龄结构，认为年产量即使超过MSY，该资源群体仍能保持相对稳定的状态。

英文摘要:

      Based on the data of fork length of Scomber japonicus caught in coastal waters of East China Sea and central & southern Yellow Sea from May to December in 2007, and fisheries production statistics of East China Sea and Yellow Sea, the biomass of Scomber japonicus resources in the western East China Sea was evaluated by length-structure VPA method and its actual utilization structure and degree were analyzed. The results showed that the age structure of Scomber japonicus of the western East China Sea populations mainly were 0+ year fish (31.87%) and 1 years fish (49.90%), the current annual resources was in number 3.68×10⁹ N and 39.55×10⁴ t in biomass, respectively. The fishery of Scomber japonicus was in the low to moderate degree, and maximum sustainable yield (MSY) is up to 24.08×10⁴ t. Catch of the year has exceeded MSY, and it can make the resource in a better state if fishing young fish is prohibited. By analyzing its utilization period and age structure of catches,it is suggested that the stock of Scomber japonicus in the western East China Sea could remain relatively steady, even though the annual yield had exceeded MSY.