Abstract
Rainbow trout ( Salmo gairdneri Richardson) with a mean initial weight of 135 g were fed diets supplemented with astaxanthin or canthaxanthin in concentrations of 0.0, 12.5, 25.0, 50.0, 100.0 and 200.0 mg/kg for 6 weeks. Fish pigmentation increased with increasing dietary carotenoid concentration up to 3.7 mg/kg flesh in the best pigmented groups. The fish were pigmented faster with astaxanthin than with canthaxanthin. For both pigments, the retention coefficients de-creased as the pigment dose in the diet increased. The mean retention coefficient for astaxanthin was 1.3 times higher than for canthaxanthin.
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