アカアマダイに対する鯛縄針とムツ針の選択性曲線の比較  [in Japanese] Comparison of hook selectivity curve between two different-shaped hooks for red tilefish Branchiostegus japonicus  [in Japanese]

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Abstract

東シナ海のアカアマダイ延縄漁業では形状の異なる鯛縄針とムツ針が用いられる。釣針の形状によって選択性が異なる可能性があり,選択性による小型魚保護のためには各釣針の選択性を評価しておく必要がある。本研究では,4 種類の大きさの鯛縄針とムツ針を用いた比較操業実験から,アカアマダイの上顎長を釣針幅で標準化した選択性曲線マスターカーブのパラメータを SELECT 法で決定した。AIC によるモデル選択の結果,鯛縄針の釣針幅とムツ針の短針幅を用いることで二つの釣針の選択性曲線を一つのマスターカーブで表せた。<br>

  Two different-shaped hooks, ‘Tainawa-bari’ and ‘Mutsu-bari’, are currently used by commercial longline fisheries targeting red tilefish in the East China Sea. The shape of ‘Mutsu-bari’ is more circular than ‘Tainawa-bari’. For protecting young small fish, selecting an appropriate hook size is a potential resource conservation measure. Hence, the size selectivity of each hook should be evaluated. Comparative fishing experiments were conducted using both ‘Tainawa-bari’ of four sizes (Japanese nominal number #10, 12, 14, and 16) and ‘Mutsu-bari’ of #13.5 size in the East China Sea. The parameters of size selectivity of ‘Tainawa-bari’ and ‘Mutsu-bari’ were estimated by the SELECT method under the assumption of geographical similarity on upper jaw length and hook width of a given retention probability. As a result of AIC model selection, a single master curve using a short hook width for ‘Mutsu-bari’ as the hook width parameter was chosen for expressing hook size selectivity of the two hooks, which implied no difference in size selectivity between the two different-shaped hooks. Thus, the single master curve for hook size selectivity and relative fishing intensity of each hook can be used for fisheries resource management.<br>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 76(1), 46-53, 2010-01-15

    The Japanese Society of Fisheries Science

References:  25

Cited by:  2

Codes

  • NII Article ID (NAID)
    10025871755
  • NII NACSIS-CAT ID (NCID)
    AN00193422
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    00215392
  • NDL Article ID
    10563335
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-345
  • Data Source
    CJP  CJPref  NDL  J-STAGE  JASI 
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