富山湾におけるサヨリ仔稚魚の相対成長と摂餌生態

DOI 日本農学文献記事索引 Web Site 参考文献17件

書誌事項

タイトル別名
  • Relative Growth and Feeding Habits of Halfbeak, Hyporhamphus sajori, Larvae and Juveniles in Toyama Bay of the Japan Sea.

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Relative growth and feeding habits of larvae and juveniles of the Japanese half beak, Hyporhamphus sajori, was assessed from data collected during a field survey in the summer of 1999. The lower jaw started to elongate from about 10 mm TL. In the allometric relationship between lower jaw length and total length, a turning point was calculated from the intersection of regression equations at 28 mm TL. This point corresponds with the total length completed at metamorphosis. Halfbeak larvae smaller than 30 mm TL fed mainly on copepod nauplii such as Oithona spp. and Paracalanus type. Larvae larger than 60 mm TL fed on larger items such as insects, harpacticoid copepods and organic detritus. In specimens beyond 57 mm TL, the rate of body weight increase with total length was greater and was apparently due to a change in dietary items.

収録刊行物

  • 水産増殖

    水産増殖 50 (1), 47-54, 2002

    日本水産増殖学会

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