小型メモリー式水深計を用いたマグロ延縄漁具の深度測定 Depth Measurements of Tuna Longline by Using Time-Depth Recorder

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著者

    • 矢野 和成 YANO Kazunari
    • 水産庁西海区水産研究所石垣支所 Seikai National Fisheries Research Institute, Ishigaki Tropical Station
    • 阿部 寧 ABE Osamu
    • 水産庁西海区水産研究所石垣支所 Seikai National Fisheries Research Institute, Ishigaki Tropical Station

抄録

The setting depth of tuna longlines was measured with time-depth recorders (18mm in diameter, 127mm in length, 33.6g in air, 5.0g in water). Two different materials (the main lines and branch lines were either polyamid [nylon] monofilament or polyester multifilament) were used for the longlines (53 were operated in total). The number of hooks used in each hachi (<i>i.e.</i>, a unit set of main line) was five, seven, or ten for both longline types. The time-depth recorders were attached to the under end of the branch lines (hook positions) and the under end of the float lines (main line positions). The depth fluctuation of the branch lines could be divided into six types. The float lines showed very little upward and downward movements. The setting depth of the branch lines was shallower than the estimated depth calculated by a catenary curve, especially with the polyamid monofilament gear. Sinking speed on the polyester multifilament gear was faster than that of the polyamid monofilament gear. The depth movments (as recorded via a hachi-attached time-depth recorder) of the longlines that fished for large fishes (e.g., <i>Prionace glauca, Thunnus alalunga, Istiophorus platypterus, Tetrapturus angustirostris, and Coryphaena hippurus</i>) showed significant upward and downward depth fluctuation, especially with the polyamid monofilament gear.

収録刊行物

  • 日本水産学会誌  

    日本水産学会誌 64(2), 178-188, 1998-03-15 

    日本水産學會

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各種コード

  • NII論文ID(NAID)
    10004852762
  • 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
    4437706
  • 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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