北海道におけるホタテガイの種苗放流効果の検討 The Stocking Effectiveness of Scallop in Hokkaido

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The aim of this article is to evaluate the effectiveness of scallop enhancement programs in Hokkaido. We analyzed the catch statistics from 1910 to 1993, and the number of seeds released from 1977 to 1993. The mean annual catch in weight in the last ten years (1984-1993) increased by 69 times in the Soya region, by 15 times in the Abashiri region, and by 6 times in the Nemuro region compared with that for the years before the commencement of stocking (1951-1973). Also, the coefficients of variation of annual catches by weight decreased considerably. The CVs between the years before stocking and the last ten years decreased from 1.41 to 0.38 in the Soya region, from 0.52 to 0.28 in the Abashiri region, and from 0.44 to 0.36 in the Nemuro region. We also analyzed the annuaI catch and seed release statistics by the local fishermen's associations. The recent increase in catches is supported by the seeds released and from increased reproduction from released seeds that have matured and added to the reproduction stock. The reproduction effect was markedly different between locations of the fishing grounds. As a whole, in Hokkaido the stock enhancement of scallop is economically successful, however, the yield for released seeds varies considerably among the fishermen's associations. Causes of the variation and release starategies were discussed.

収録刊行物

  • 日本水産学会誌  

    日本水産学会誌 63(5), 686-693, 1997-09-15 

    日本水産學會

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各種コード

  • NII論文ID(NAID)
    10004851735
  • 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
    4305144
  • 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  NDL  IR  J-STAGE 
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