文章摘要
李明云.东海北部哈氏仿对虾的种群动态及其最高持续渔获量[J].水产学报,2000,24(4):
东海北部哈氏仿对虾的种群动态及其最高持续渔获量
Population dynamics and estimation of maximum sustaining yield for Parapenaeopsis hardwickii in the northern area of East China Sea
投稿时间:2014-04-16  修订日期:2014-04-16
DOI:
中文关键词: 哈氏仿对虾 种群动态 最高持续渔获量 东海
英文关键词: Parapenaeopsis hardwickii , population dynamics, maximum sustaining yield
基金项目:
作者单位地址
李明云 宁波大学海洋与水产系 宁波大学海洋与水产系
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中文摘要:
      哈氏仿对虾是东海北部主要的拖虾渔业对象。在雌性的体长组成中,70-90mm的个体占优势,占总数的63%。应用ELEFANⅠ和ELEFANⅡ技术对哈氏仿对虾每月的体长资料进行分析,结果表明:生长参数K=1.7,极限体长L∞=128mm,自然死亡系数M=2.7427,总死亡系数Z=8.323,利用率E=67.06%,极限年龄为1.3234岁,选择体长为59.67mm,补充类型为二季补充型。通过单位补充量产量Y/R和单位补充量产值Yv/R分析表明,该群体的利用已到了相当充分的水平,若保持现有的捕捞水平,把开捕体长增大至70mm时,单位补充量产量可增加1.77%,产值可增加10.78%。但若捕捞死亡水平继续增加,产量几乎不再增加,而产值却明显下降。
英文摘要:
      Based on the monthly length-frequency data obtained from the northern area of East China Sea during the periods of 1986 - 1987 and 1993 - 1995, the population dynamics and maximum sustaining yield of Parapenaeopsis hardwickii were studied. The dominant length group for the female was 70- 90mm, which was 63% of the total female. By using ELEFAN.and òtechnique, the growth parameters were estimated: K= 1. 7, L ] = 128mm and t0= - 0. 1185, the approximate longevity was 1. 3234 years. Total mortality z= 8. 3280 , and mean selection length Lc = 59. 67mm. Natural mortality M = 2. 7427 was est imated by using the empirical relationship between M, the growth parameters and mean environmental temperature, and the exploitation rate, E = F/ Z = 0. 6706, was obtained. Yield-per-recruit and the value of yield-per-recruit analysis indicated that the stock of Parapenaeopsis hardwickii had been fully exploited. An increase in yield-per-recruit and the value of yield-per-recruit may be expected if the size of first capture has a moderate increase. The value of yield-perrecruit would be reduced with the increase of f ishing mortality.
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