ヒラメの白化個体出現に及ぼす変態期の餌料の影響

概要

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The dietary-related albinism in juvenile flounder Paralichthys olivaceus was investigated by offering several foods to the larvae during metamorphosis. Newly hatched larvae were reared on rotifer Brachionus plicatilis alone until they reached 6.8mm in total length. Thereafter, the larvae were divided into 8 groups with duplicates and reared on rotifer, vitamin-enriched rotifer, Artemia salina nauplii, vitamin-enriched Artemia nauplii, fertilized eggs of red sea bream Pagrus major and micro formulated diet, singly or combined, until the juveniles reached develop-mental stage G (nearly 10mm in TL), and then were reared on rotifer and Artemia nauplii until they had completely metamorphosed. The appearance of albinism was monitored among the juveniles accepting various foods. The occurrence of albinism was the highest in the juveniles fed on rotifer and/or Artemia (88-98%), the intermediate in the juveniles fed on the vitamin-enriched rotifer (74-76%) and on the micro formulated diet (54-60%), and the lowest in the juveniles fed on the eggs of the red sea bream (4-20%). The red sea bream egg was the best food for reducing the albinism which occurs in hatchery-reared flounder.
日本水産學會の論文