This study aimed to evaluate the effect of lutein supplementation on growth, survival and skin pigmentation for goldfish juveniles. Four diets enriched with different carotenoid sources (lutein, astaxanthin, canthaxanthin and a combination of lutein and canthaxanthin) were compared to a control diet without carotenoid supplementation. The carotenoid inclusion level was standardized at 50 mg kg‐1 in all treatments. 240 goldfish juveniles (1.07�0.57 g) were cultivated in 30 aquariums (30L) during 84 days. The experimental design was completely randomized with five treatments and six replicates. The dietary inclusion of carotenoid pigments did not affect the growth and feeding efficiency of goldfish juveniles. Supplementation with lutein presented higher survival values when compared to the other treatments. Astaxanthin and canthaxanthin supplementation increased the concentration of carotenoids on the skin of goldfish juveniles in relation to the control treatment. For the fish fed with the diet containing lutein, the skin pigmentation was as efficient as astaxanthin and canthaxanthin, but did not differ from the control and combined treatment (canthaxanthin + lutein). The lutein supplementation (50 mg kg‐1) improved survival and promoted efficient carotenoid pigmentation on the skin of goldfish juveniles.

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Sardinella sp. protein hydrolyzate in the feed of Rhandia quelen 957 Lat. Am. J. Aquat. Res., 44(5): 957-966, 2016 "Pathways for sustainable industrial fisheries in southeastern and southern Brazil" P.M. Arana, P.R. Pezzuto, A.O. Ávila-da-Silva, D. Queirolo, J.A.A. Perez & C.A. Arfelli (eds.). Research ArticleEffect of diets containing different types of sardine waste (Sardinella sp.) protein hydrolysate on the performance and intestinal morphometry of silver catfish juveniles (Rhamdia quelen) ABSTRACT. In this study two fractions of muscle hydrolysate were tested, soluble and insoluble (FSM and FIM), they were assessed individually and combined with each other (FSM+FIM). Also, two fractions of hydrolyzed viscera: soluble of natural and industrialized viscera (FSVN and FSVI) were tested on the performance and on the intestinal morphology of juvenile catfish (Rhamdia quelen). The experimental design was completely randomized with five treatments and five replicates. Juveniles were kept in aquariums with density of eight fish per tank and were cultured for 56 days. The results were analyzed using parametric variance analysis (ANOVA) and subjected to the Duncan test (5% significance level). The best results on final weight, weight gain, feed conversion rate, and protein efficiency ratio were obtained with the diet containing FSM+FIM, and the diet containing the FSVI. The latter was also the most consumed by the animals. The diet containing FIM was the one that provided the worst consumption results. The worst feed conversion rate was obtained for the diet containing FSM. Survival and body composition did not differ between treatments. The separation of the soluble and insoluble fractions is not necessary or even recommended when the goal is to use the muscle hydrolysate as the ingredient in feed for silver catfish juveniles. The best performance results obtained were with the combination of soluble and insoluble fractions of muscle hydrolysate, and with the industrial viscera soluble hydrolysate. The degree of hydrolysis has a direct effect on feed consumption. Keywords: Rhamdia quelen, enzymatic hydrolysis, fish waste, animal feed, aquaculture. . El diseño experimental fue completamente aleatorio con cinco tratamientos y cinco réplicas. Los juveniles se mantuvieron en acuarios con una densidad de ocho peces por estanque y se cultivaron durante 56 días. Los resultados se analizaron mediante análisis de varianza paramétrico (ANOVA) y se sometieron a la prueba de Duncan (nivel de significación 5%). Los mejores resultados de peso final, ganancia de peso, conversión alimenticia, y la tasa de eficiencia proteica, se obtuvieron con la dieta que contenía FSM+FIM, y la dieta que contenía el FSVI. Esta última fue también la más consumida por los animales. La dieta que contiene el FIM fue la que proporcionó los peores resultados de consumo. Se obtuvo el peor índice de conversión alimentaria con la dieta que contiene el FSM. La supervivencia y la composición corporal no difirieron entre tratamientos. La separación de las ...

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