Maeland A ; Ronnestad I ; Waagbo R ;

Aquaculture Nutrition vol. 9 (3)   pp. 185-188, Jui 2003

Institute of Nutrition, Directorate of Fisheries, Bergen, Norway,
rune.waagbo@nutr.fiskeridir.no

Folate mobilization from the yolk compartment during larval development was studied by analysing the folate concentration in whole body, embryo and yolk in a single batch of Atlantic halibut, Hippoglossus hippoglossus L., eggs and larvae that showed successful fertilization and development. There was a net loss of approx. 50% of folate from yolk during endogenous feeding. Further, only 23% of the decrease in yolk folate was retained in the larval body. The data suggest a need for folate for metabolic and growth purposes during embryogenesis of approximately 2 mu g g super(-1) weight gain. Relative to these data and published folate requirement for cold-water species, batches of egg from 16 Atlantic halibut brood fish contained variable and, for some batches, critically low levels of folate. This may constitute a potential problem for larval development until start feeding

Yolk ;  Embryos ;  Fish eggs ;  Fish larvae ;  Animal nutrition ;  Nutritional requirements ;  Embryonic development ;  Vitamin B ;  Hippoglossus hippoglossus ; 

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