Influence of Feeding Periods of Brazilian Artemia during Larval Development of Hatchery-reared Flounder Paralichthys olivaceus on the Appearance of Albinism

Abstract

The influence of feeding periods of Brazilian Artemia salina nauplii on the appearance of albinism in juvenile flounder P. olivaceus was examined. Flounder larvae were initially reared with only rotifer Brachionus plicatilis to 5.57 mm TL. Artemia salina nauplii were given to flounder larvae on four different feeding periods from 5.57 mm to about 16.1-18.7 mm TL (complete metamorphosis). Rotifer was also used for the diet. Albinism on juvenile flounder (16.1-18.7 mm TL) were classified based on their albinic portions. Feeding with Artemia from the earlier stages (5.57 mm and 8.67-8.86 mm TL) resulted in the especially high frequency occurrences of albinism 97.0-97.6%, and the albinic portions extended over almost all of the ocular side. Feeding with Artemia from later stages (10.21-10.43 mm and 12.98-13.23 mm TL) reduced those of albinism (83.5-82.9% and 22.9-24.1% respectively), and their ablinic portions restricted to rather limited part of ocular side. These results suggested the close relationship between albinism occurrence of juvenile flounder and giving a particular kind of food during larval stage. © 1985, The Japanese Society of Fisheries Science. All rights reserved.