Conjugated linoleic acid in diets for lambari (Astyanax altiparanae) (Garutti & Britski, 2000)

Abstract

This study aimed to evaluate the effect of different levels of conjugated linoleic acid (CLA) on growth performance, carcass chemical composition and fatty acid profile of lambari (Astyanax altiparanae). A completely randomized experimental design with six treatments, diets with graded levels of CLA (0.0, 5.0, 10.0, 15.0, 20.0 and 25.0 g kg−1) and five repetitions. Fish (n = 570; weight: 1.58 ± 0.23 g) were distributed into 30 (70‐L) aquaria and fed the experimental diets during 90 days. No effects of dietary supplementation with CLA on fish performance and carcass chemical composition were observed. CLA influenced carcass fatty acid profile, a positive relationship was found for 16:1 n‐9, 18:1 n‐9, 18:2(cis‐9, trans‐11), 18:2(trans‐10, cis‐12) and 20:1 n‐9, and a negative relationship was found for 15:1 n‐7, 16:0, 16:1 n‐5, 18:2 n‐6, 18:3 n‐3, 20:5 n‐3 and 22:4 n‐6. Total CLA and monounsaturated fatty acids (MUFA) linearly increased with the increase in dietary CLA, while saturated fatty acids (SFA) and polyunsaturated fatty acids (PUFA) of n‐6 and n‐3 series linearly decreased. Dietary CLA can be incorporated into the lambari (A. altiparanae) muscle, and the fish can be used as functional foods, because CLA is related to the prevention of various diseases in humans.