Influence of Water Velocity on Spawning Behavior and Egg Survival of Shishamo Smelt

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  • NII Hisaya
    Graduate School of Fisheries Science, Hokkaido University Hokkaido Aquaculture Promotion Corporation
  • UEDA Hiroshi
    Graduate School of Fisheries Science, Hokkaido University Field Science Center for Northern Biosphere, Hokkaido University

Bibliographic Information

Other Title
  • シシャモの産卵行動および産着卵の生残に及ぼす河川流速の影響
  • シシャモ ノ サンラン コウドウ オヨビ サンチャクラン ノ セイザン ニ オヨボス カセン リュウソク ノ エイキョウ

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Description

Our previous work has shown the density of spawned eggs of shishamo smelt, Spirinchus lanceolatus, to be influenced by the water velocity of the river. The purpose of the present study is to investigate the influence of water velocity on spawning behavior and egg survival of shishamo smelt in a water tank. Three different experiments were carried out on the influence of water velocity on the mating behavior, the influence of water velocity on the exfoliation of eggs, and the influence of a mud covering on the survival of eggs. When the water velocity exceeded 0.6 m/sec, the adult smelt were not able to display spawning behavior, and any eggs became easy to exfoliate. Egg survival rate decreased with covering depth of mud over 4 mm. These data may be useful for the conservation and restoration of spawning habitats of Shishamo smelt in their native rivers.

Journal

  • Aquaculture Science

    Aquaculture Science 54 (4), 437-447, 2006

    Japanese Society for Aquaculture Science

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