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- W2022941288 abstract "Norwegian shrimp meal contains astaxanthin (diester 88%, monoester 12%). The total content of the pigments amounts to 25.2 mg/kg dry meal. Incorporation of this shrimp meal at 30% in rainbow trout diets with three different fat levels (9.4, 12.08, 17.4%) causes a reddish pigmentation of the skin and muscle. In the skin, astaxanthin was found in diester form, whereas this pigment was in a free form in the muscle. An increased lipid content in the diet does not seem to enhance deposition of carotenoids in the fish. Although the increase in carotenoid percentage in trout skin and muscle is important (1 mg/fish), it is relatively small compared to the large amount of pigment (25 mg/kg) contained in shrimp meal. The low fixation of carotenoids by trout is due to the poor digestibility of pigments. Since nearly 90% of the ingested pigments are found in feces, this implies that the main obstacle to carotenoids fixation is of digestive origin. On a déterminé l'influence de la nature, de la forme et de la quantité d'astaxantine ingérée par la truite arc-en-ciel (Salmo gairdneri Rich.) sur la fixation de ce pigment. Pour cela on a utilisé de la farine de crevette contenant 25,2 mg d'astaxanthine/kg de farine (M.S.), forme diester 88%, monoester 12%. L'incorporation de 30% de farine de crevette dans un aliment pour truite contenant trois taux de lipides (9,4; 12,8 et 17,4%) entrîne une coloration rouge de la peau et du muscle des poissons. Alors que dans la peau l'astaxanthine est sous forme diester, dans le muscle ce pigment est sous forme libre. L'augmentation du taux de lipides du régime alimentaire ne semble pas favoriser le déôt en pigments. Bien que le dépôt en pigment caroténoïde soit important (1 mg/poisson), il reste relativement faible compte tenu de la forte teneur en farine de crevette du régime alimentaire (25 mg/kg). La faible fixation de caroténoïdes par la truite est due à une faible digestibilitié des pigments; près de 90% des pigments ingérés se retrouvent dans les fèces. Ceci implique que le principal obstacle à la fixation des pigments caroténoïdes se situe au niveau digestif." @default.
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- W2022941288 date "1983-04-01" @default.
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- W2022941288 title "Utilization of shrimp meal for rainbow trout (Salmo gairdneri Rich.) pigmentation. Influence of fat content of the diet" @default.
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- W2022941288 doi "https://doi.org/10.1016/0044-8486(83)90266-1" @default.
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