南沙群岛西南陆架区金线鱼资源与管理的研究

Study of stock and management of Nemipterus virgatus in southwestern continental shelf of Nansha Islands

  • 摘要: 根据2003年南沙群岛西南陆架区春秋2季调查的资料,结合1990~1993年的历史资料,分析南沙群岛西南陆架区金线鱼的资源现状。结果表明,渔获率有季节变动,秋季(1.13 kg · h-1)高于春季(1.07 kg · h-1),群体主要分布于91~100 m水深。其群体组成也有季节差异,秋季的平均体长、平均体重大于春季,春季优势体长范围为151~190 mm,秋季优势体长范围为141~220 mm。该鱼种资源已明显衰退,平均渔获率由3.32 kg · h-1减为1.10 kg · h-1,资源密度由43.37 kg · km-2减为14.37 kg · km-2,资源量由3 178.60 t减为1 053.15 t,现存资源量只有原始资源量的33.24%。并提出合理利用该鱼种资源的管理措施和建议。

     

    Abstract: The stock status of Nemipterus virgatus(Houttuyn), is analyzed according to twice survey data in southwestern continental shelf of Nansha Islands of spring and autumn in 2003 and referring to the similar survey data from 1990 to 1993. The results show the catch rate varies with season, and is more in autumn(1.13 kg · h-1)than in spring(1.07 kg · h-1), the same as the average body-length and body-weight, the range of predominant body-length is during 151~190 mm in spring and 141~220 mm in autumn, and it mainly distributes in depth of 91~100 m. The stock of this species has decayed markedly, with the average catch rate decreasing from 3.32 kg · h-1 to 1.10 kg · h-1, the stock density from 36.73 kg · km-2 to 14.37 kg · km-2 and the biomass from 3 178.60 t to 1 053.15 t. The present abundance is only 33.24% of the original. The management measures and advices of this species stock are also put forward in the paper.

     

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