北西太平洋産クロマグロＴｈｕｎｎｕｓ　ｔｈｙｎｎｕｓ仔魚の食性

DOI 日本農学文献記事索引 Web Site 被引用文献8件

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タイトル別名
  • Feeding habit of bluefin tuna Tunnus thynnus larvae in the western North Pacific Ocean.
  • ホクセイ タイヘイヨウサン クロマグロ Thunnus thynnus シギ

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This study examined the gut contents of 1, 939 larvae (2.28-14.60mm in total length) of bluefin tuna Thunnus thynnus collected in 1981 and 1982 by larva-net tows in the waters around Nansei Islands, and described their feeding condition and morphological development.<br> The larvae fed on small zooplankton, mainly copepods, in the daytime: those less than 5mm TL on copepoda nauplii of less than 0.3mm in body length, and those larger than 5mm TL on larger copepods, especially of genus Corycaeus. This significant improvement of feeding ability at 5mm TL was also recognized both from examination of empty stomach rate and wet weight of gut content. The analysis of relative growth of the larvae showed that their external shape became constant at about 5mm TL.<br> These results suggest that the larvae larger than 5mm TL fed more efficiently than smaller ones, getting higher chance of survival.

収録刊行物

  • 日本水産学会誌

    日本水産学会誌 56 (5), 713-717, 1990

    公益社団法人 日本水産学会

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