Abstract
This study examined the effect of sodium taurocholate as a feed additive on the pigmentation efficacy of astaxanthin in blood parrot (Cichlasoma synspilum ♀×Cichlasoma citrinellum ♂). A total of 396 fish were divided into six treatment groups with three replicates per treatment. The following experimental treatments were used: a basal diet (A) without astaxanthin; one diet (B) with 4‰ of astaxanthin; one diet (C) with only sodium taurocholate (600mg/kg); and three diets with 4‰ astaxanthin plus sodium taurocholate (D, 400mg/kg; E, 1200mg/kg; F, 2000mg/kg). Six fish per group were sampled at 15, 30 and 45days. At the end of the experiment, the carotenoid content of the skin and the caudal fin in blood parrot fed with a supplementation of sodium taurocholate plus 4‰ astaxanthin was significantly higher than the corresponding values for the fish fed with 4‰ astaxanthin only (P<0.05). The results demonstrated that sodium taurocholate is useful for promoting the absorption of astaxanthin and for promoting the pigmentation efficacy of blood parrot. This supplementation has potential applications for studying the color additives and formulated diets of ornamental fish.
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