Possibilities to raise vitamin D content of rainbow trout (Oncorhynchus mykiss) by elevated feed cholecalciferol contents
1999
Mattila, P. | Piironen, V. | Hakkarainen, T. | Hirvi, T. | Uusi-Rauva, E. | Eskelinen, P.
Farmed rainbow trout (Oncorhynchus mykiss) is a widely consumed fish species. The cholecalciferol content in the muscle of rainbow trout is, however, quite low compared with that in several wild fish species. The present study was designed to determine whether it is possible to increase the cholecalciferol content of rainbow trout (initial weight about 500 g) with the use of cholecalciferol-dosed feeds. Three different cholecalciferol concentrations (8.9, 17.4 and 53.9 microgram 100 g-1 feed) were tested. After 4 months of feeding, the cholecalciferol determinations from samples of muscle and liver were performed using an HPLC method. Here, we suggest that the cholecalciferol content of rainbow trout muscle cannot be increased by feeding them with elevated doses of the vitamin.
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