Stomach contents of a megamouth shark Megachasma pelagios from the Kuroshio Extension : evidence for feeding on a euphausiid swarm

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More than 50 specimens of the megamouth shark <i>Megachasma pelagios </i>have been reported so far, but biological observations on the species are still limited. We examined a female megamouth specimen that was captured by the bonito purse seine fishery in the Kuroshio Extension in July 2007 and donated to the Okinawa Churaumi Aquarium. The specimen was an immature female, 3,667 mm in total length and 361 kg in weight. The stomach contents measured 2,200 mL excluding the portion that was lost from the specimen before measurement. Detailed examination of a small part (14.6 mL) of the stomach contents revealed undamaged worm-like organisms, 10 partially damaged euphausiids and abundant fragmented pieces of euphausiids. The worm-like organisms were probably parasites such as tapeworms. The partially damaged euphausiids were identified as <i>Euphausia pacifica</i> except for one individual of <i>Nematoscelis difficilis</i>. Based on the number of fragmented right mandibles, which were less damaged than the other fragmented appendages, the total number of euphausiids in the stomach contents is estimated to be at least 18,000 individuals. The high abundance of euphausiids in the stomach contents suggests that the present specimen has fed on a swarm of <i>E. pacifica</i> in an oceanic area.

収録刊行物

  • Plankton & benthos research

    Plankton & benthos research 7(4), 203-206, 2012-11-01

    日本プランクトン学会、日本ベントス学会

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各種コード

  • NII論文ID(NAID)
    10031131492
  • NII書誌ID(NCID)
    AA12130745
  • 本文言語コード
    ENG
  • 資料種別
    NOT
  • ISSN
    18808247
  • NDL 記事登録ID
    024128275
  • NDL 請求記号
    Z54-J424
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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