Age structure estimation from size data for hirtail in the nortern East China Sea.

DOI JASI Web Site 2 Citations
  • Xu Xuelong
    East China Sea Fisheries Research Institute of Chinese Academy of Aquatic Sciences
  • Tanaka Syoiti
    Tokyo University of Fisheries
  • Mi Chongdao
    East China Sea Fisheries Research Institute of Chinese Academy of Aquatic Sciences

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Other Title
  • 東シナ海北部のタチウオ体長組成からの年齢組成の推定
  • 東シナ海北部のタチウオ体長組成からの年齢組成の推定〔英文〕
  • ヒガシシナカイ ホクブ ノ タチウオ タイチョウ ソセイ カラ ノ ネンレイ

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Abstract

The estimation of age structure for hadrtail Trichiurus haumera (Forskål) inhabiting the north-ern East China Sea has been tried using size-frequency data over the years. Since most of size-frequency distributions of samples are not clearly polymodal, an improved least-squares method for analysing such data was used. The method does not require initial values of fish number for each age group for starting computation and only requires a possible range for mean size and standard deviation, which can be determined according to biological information. The result of this study shows that the dominant age group in the catches of hairtail is age 1. The effectiveness of this method was compared with the linear approximation and the Marquardt's methods pub-lished by other authors. It is verified that this method could be applicable to non-polymodal frequency distribution for which the last two methods may provide rather poor results.

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 54 (10), 1703-1710, 1988

    The Japanese Society of Fisheries Science

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