Records of Entosphenus tridentatus from the Naka River system, central Japan; Physical characteristics of possible spawning redds and spawning behavior in the aquarium.

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  • 栃木県那珂川水系におけるミツバヤツメの捕獲記録，産卵床の立地条件および水槽内における産卵

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Description

Twenty-one specimens of the Pacific lamprey, Entosphenus tridentatus, were collected from the Hoki (8 specimens), Yusaka (11 specimens) and Arakawa Rivers (1 specimen), all tributaries of the Naka River, and the mainstream of the Naka River (1 specimen), Tochigi Prefecture, central Japan, between August 1999 and April 2001. Seven spawning redds, possibly constructed by Entosphenus tridentatus, were found in the Yusaka River on May 2 and 11, 2000, eggs being observed in one of them. Two specimens, collected from the Yusaka River and reared in an aquarium with a gravel substrate, subsequently spawned about 1000 eggs being observed in the redd. Forty-one of the eggs were reared at 15°C in an electric incubator, hatching starting 13-17 days after spawning. The hatching percentage was 92.7%, the accumulative temperature to hatching being between 195 and 255°C.

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Details 詳細情報について

  • CRID
    1390001204767746944
  • NII Article ID
    130004019293
  • DOI
    10.11369/jji1950.49.53
  • ISSN
    18847374
    00215090
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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