屋内大型水槽を用いた自由遊泳するマアジのターゲットストレングス測定  [in Japanese] Target strength measurement of free-swimming jack mackerel using an indoor large experimental tank  [in Japanese]

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Author(s)

    • 川内 陽平 KAWAUCHI YOHEI
    • (国研)水産研究・教育機構西海区水産研究所 Seikai National Fisheries Research Institute, Japan Fisheries Research and Education Agency
    • 中川 雅弘 NAKAGAWA MASAHIRO
    • (国研)水産研究・教育機構西海区水産研究所 Seikai National Fisheries Research Institute, Japan Fisheries Research and Education Agency
    • 白川 北斗 SHIRAKAWA HOKUTO
    • 北海道大学北方生物圏フィールド科学センター|JST・CREST Field Science Center for Northern Biosphere, Hokkaido University|JST・CREST
    • 宮下 和士 MIYASHITA KAZUSHI
    • 北海道大学北方生物圏フィールド科学センター|JST・CREST Field Science Center for Northern Biosphere, Hokkaido University|JST・CREST
    • 岩原 由佳 IWAHARA YUKA
    • (国研)水産研究・教育機構開発調査センター Marine Fisheries Research and Development Center, Japan Fisheries Research and Education Agency
    • 小林 基樹 KOBAYASHI MOTOKI
    • 北海道大学北方生物圏フィールド科学センター Field Science Center for Northern Biosphere, Hokkaido University
    • 酒井 猛 SAKAI TAKESHI
    • (国研)水産研究・教育機構西海区水産研究所 Seikai National Fisheries Research Institute, Japan Fisheries Research and Education Agency
    • 邵 花梅 SHAO HUAMEI
    • (国研)水産研究・教育機構西海区水産研究所 Seikai National Fisheries Research Institute, Japan Fisheries Research and Education Agency

Abstract

<p> 屋内大型水槽で自由遊泳するマアジ(尾叉長<i>L</i>=12.5-27.5 cm)のターゲットストレングス(TS)と遊泳角・遊泳速度を,38 kHzと120 kHzのスプリットビーム式計量魚群探知機により推定した。遊泳角は−35から30°で,0°付近にピークがあった。遊泳速度は1.2 <i>L</i>/s以下がほとんどであった。<i>L</i>の2乗で規準化した平均TSは38 kHzで−67.7 dB, 120 kHzで−69.5 dBであった。既往の研究との比較から,実測に基づく実用的なマアジのTSを明らかにできたと考える。</p>

<p> Target strengths (TSs), swimming angles and swimming speeds of free-swimming Japanese jack mackerels (JJMs) with extended body size range (fork length (<i>L</i>)=12.5-27.5 cm) in an indoor large experimental tank were revealed, based on TS measurements using a split-beam scientific echosounder operating at 38 and 120 kHz. The swimming angles ranged from −35 to 30°, and had a peak of about 0°. Most of the swimming speeds were under 1.2 <i>L</i>/s. TS<sub>cm</sub>, i.e. the mean TS normalized by the square of <i>L</i>, at 38 and 120 kHz were estimated as −67.7 dB and −69.5 dB, respectively. These swimming properties and TS<sub>cm</sub> were similar to those of JJM and related species in previous literatures. Therefore, the present study revealed the practical TSs of JJMs based on actual measurements.</p>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 85(1), 2-16, 2019

    The Japanese Society of Fisheries Science

Codes

  • NII Article ID (NAID)
    130007600138
  • NII NACSIS-CAT ID (NCID)
    AN00193422
  • Text Lang
    JPN
  • ISSN
    0021-5392
  • NDL Article ID
    029508666
  • NDL Call No.
    Z18-345
  • Data Source
    NDL  J-STAGE 
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