東京湾柴地先におけるトリガイの資源量推定と評価 Estimation of Population Size and Stock Assessment of Fulvia mutica(Reeve)in Tokyo Bay

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Population size and catchability coefficient of the cockle <i>Fulvia mutica</i> (Reeve) in Tokyo Bay were estimated using De Lury's method. Then, the present status of the stock was assessed based on the yield per recruitment theory of Beverton and Holt. <br>The population size (<i>N</i><sub>0</sub>) and the catchability coefficient (<i>q</i>) were estimated as 39 to 788 (×10<sup>4</sup>) in number and 0.58 to 2.85 (×10<sup>-3</sup>) per boat•day from 1978 to 1989, respectively. Annual fluctuations of <i>N</i><sub>0</sub> are corresponded with those of catches (<i>C</i>) and CPUE, and it shows that the stock is in a very unstable condition. Exploitation rate (<i>C/N</i><sub>0</sub>) is between 0.4 to 0.9 and, in most years, it is over 0.6 and fishing effort is in a high level. Also the exploitation rate apparently increased with decrease of the catches, it has the inclination that the fishing effort gets stronger as the stock abundance is poorer. Isopleth diagram of catch yield per recruit (<i>Y/R</i>) shows that raising the age at first capture is more effective than increasing fishing effort to achieve the maximum yield per recruit and in keeping the stability of the stock.

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  • 日本水産学会誌  

    日本水産学会誌 63(4), 542-548, 1997-07-15 

    日本水産學會

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各種コード

  • NII論文ID(NAID)
    10004851422
  • NII書誌ID(NCID)
    AN00193422
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00215392
  • NDL 記事登録ID
    4258509
  • NDL 雑誌分類
    ZR26(科学技術--農林水産--水産)
  • NDL 請求記号
    Z18-345
  • データ提供元
    CJP書誌  CJP引用  NDL  IR  J-STAGE 
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