Starving Process of Ayu Hatchlings under Different Saline Water Conditions

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  • 異なる塩水条件下におけるアユ孵化仔魚の飢餓プロセス
  • コトナル エンスイ ジョウケン カ ニ オケル アユフカシギョ ノ キガ プロセス

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Abstract

Ayu Plecoglossus altivelis is migratory fish that experiences estuarine backish water in the early life stages. The recent decline in the abundance of populations that ascend into rivers is of concern for freshwater fisheries. The present study aims to elucidate the starving process that determine the early success of ayu hatchlings under the variable environmental conditions in terms of salinity and water temperature. Transition from endogenous feeding state to irrecoverable starved state occurred at the time when the yolk-sac became unnoticeable, a couple of days before being consumed to death accordingly to the water conditions. RNA/DNA revealed that high salinity and high water temperature together required more cost for maintenance including osmoregulation, resulting in the acceleration of yolk depletion and led to reduced metabolic activity. Seawater with a high temperature is considered to have an adverse effect on the survival of newly hatched larvae.

Journal

  • Aquaculture Science

    Aquaculture Science 58 (4), 459-463, 2010

    Japanese Society for Aquaculture Science

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