海亀の前肢のはばたきと推進力について  [in Japanese] Propulsive force generated by flipper beat of sea turtles  [in Japanese]

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Author(s)

    • 塩澤 舞香 SHIOZAWA MAIKA
    • 東京海洋大学大学院海洋科学技術研究科 Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology
    • 塩出 大輔 SHIODE DAISUKE
    • 東京海洋大学大学院海洋科学技術研究科 Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology
    • 胡 夫祥 HU FUXIANG
    • 東京海洋大学大学院海洋科学技術研究科 Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology
    • 東海 正 TOKAI TADASHI
    • 東京海洋大学大学院海洋科学技術研究科 Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology
    • 小林 真人 KOBAYASHI MASATO
    • (国研)水産研究・教育機構西海区水産研究所亜熱帯研究センター Research Center for Subtropical Fisheries, Seikai National Fisheries Research Institute, Japan Fisheries Research and Education Agency

Abstract

<p> 中層・底層定置網の箱網用海亀脱出装置における扉の設計のために,アオウミガメ(標準直甲長 0.39-0.72 m)とアカウミガメ(同 0.63-0.84 m)の前肢のはばたきによって生じる推進力を屋外水槽で計測し,はばたきの周波数をビデオ映像より求めた。推進力とはばたきの周波数,一連のはばたきの回数は時間経過とともに減少したが,30 分経過後でも海亀脱出装置の扉を押し開けるのに必要な 40 N より大きな推進力が得られた。入網した海亀は,現在考案されている海亀脱出装置の扉を押し開けることが可能であると考えられた。</p>

<p> Propulsive force generated by flipper beat of sea turtles was evaluated to confirm the design adequacy of a flap door covering the outlet in a sea turtle releasing device (TRD) for large-scale set nets. The force generated by flipper beat was measured by a tension meter using nine green turtles (SSCL: 0.39-0.72 m) and four loggerhead turtles (0.63-0.84 m) in a water tank (10 m×10 m×2.1 m depth). Video recording was simultaneously conducted and time-series data of flipper beats were obtained. Sea turtles alternated a set of flipper beats with a rest. The average of peak force values and flipper beat frequencies in a set of flipper beats decreased in order of each set for both species. Both the force and beat frequency of green turtles were twice as large as those of loggerhead turtles, and the impulse values of a single beat were similar between the two species. There was a strong linear relationship between peak force value and turtle body size in the first set, but there was no significant relationship after thirty minutes later for both species. Even after 30 minutes and later, the generated force was still large (>40 N) enough to open the flap door of the current TRD.</p>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 82(4), 550-558, 2016

    The Japanese Society of Fisheries Science

Codes

  • NII Article ID (NAID)
    130005406788
  • NII NACSIS-CAT ID (NCID)
    AN00193422
  • Text Lang
    JPN
  • Article Type
    journal article
  • ISSN
    0021-5392
  • NDL Article ID
    027571764
  • NDL Call No.
    Z18-345
  • Data Source
    NDL  J-STAGE  JASI 
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