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Carotenoids in diets for salmonids iii. utilization of canthaxanthin from dry and wet diets by atlantic salmon salmo salar rainbow trout salmo gairdneri and sea trout salmo trutta



Carotenoids in diets for salmonids iii. utilization of canthaxanthin from dry and wet diets by atlantic salmon salmo salar rainbow trout salmo gairdneri and sea trout salmo trutta



Aquaculture 51(3-4): 245-256



Yearlings of Atlantic salmon (S. salar L.), rainbow trout (S. gairdneri Richardson) and sea trout (S. trutta L.) were fed to excess with dry and wet diets containing canthaxanthin for 14 months. The fish were maintained in sea-pens at four different experimental stations along the West coast of Norway. Fish were sampled at intervals of 2-3 months, and the carotenoid composition of flesh from the tail sections was analysed. Rainbow trout was the most efficiently pigmented when pigmentation was related to feeding period, while sea trout was the most efficiently pigmented in relation to fish growth. Salmon utilized canthaxanthin least efficiently in both cases. The extent of pigmentation varied according to geographical location, decreasing from the southern to the northern localities. The wet diet resulted in a lower pigmentation than the dry one. No other carotenoids than canthaxanthin (administered) and astaxanthin (from external sources) were detected in the flesh. The relative amount of astaxanthin was greatest in the fish fed the wet diet.

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Accession: 004884605

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