我が国のアサリ漁獲量激減の要因について  [in Japanese] Factors responsible for the drastic catch decline of the Manila clam Ruditapes phillipinarum in Japan  [in Japanese]

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Abstract

我が国のアサリ <i>Ruditapes phillipinarum</i> の総漁獲量は,1960 年には 10 万トンであった。その後,一部に漁場の埋め立てによる減少があったにも関わらず,1982 年には 14 万トンまで増加したが,1984 年から激減して,1994 年にはわずか 3 分の 1 程度(5 万トン)になり,その後もこの水準が続いている。著者らはアサリの生態や資源に関する報告を総括し,1984 年以降のアサリ漁獲量の激減の主要因を過剰な漁業活動,すなわち親貝と種貝用の稚貝に対する過剰漁獲と結論づけた。それ以外にも,周年の過剰操業による底質擾乱は,稚貝の生残率低下を助長した可能性が高いと考えられる。<br>

  The annual catch of the Manila clam <i>Ruditapes phillipinarum</i> in Japan increased from 100 thousand tonnes in 1960 to 140 thousand tonnes in 1982. This increase occurred despite a local decrease in coastal fishing grounds due to land reclamation and helped to balance overall production. Since 1984, however, the catch has decreased drastically to only 50 thousand tonnes and has remained at this low level. The authors reviewed published reports relevant to the ecology and resources of Manila clam and concluded that the main factor responsible for the drastic decrease in catch is over-fishing. Over-exploitation of the adults and sub-adults significantly affected and damaged reproduction and source-sink relationships among localities. Disturbance of the clam habitat throughout the year by heavy fishing gear may also be responsible for lowering the survival rate of the juveniles.<br>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 74(2), 137-143, 2008-03-15

    The Japanese Society of Fisheries Science

References:  60

Cited by:  8

Codes

  • NII Article ID (NAID)
    110006644789
  • NII NACSIS-CAT ID (NCID)
    AN00193422
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    00215392
  • NDL Article ID
    9433049
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-345
  • Data Source
    CJP  CJPref  NDL  NII-ELS  IR  J-STAGE 
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