Níveis de inclusão do ácido linoléico conjugado (CLA) em dietas para lambaris-do-rabo-amarelo (Astyanax altiparanae)

• Autor(a) principal: Campelo, Daniel Abreu Vasconcelos
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2257
• topic: Ácidos graxos; Alimento nutracêutico; Composição de carcaça; Desempenho zootécnico; Fatty acids; Food nutraceutical; Carcass composition; Performance zootechnical; CNPQ::CIENCIAS AGRARIAS::RECURSOS PESQUEIROS E ENGENHARIA DE PESCA::AQUICULTURA::PISCICULTURA

Among the studies related to the study of fatty acids, the use of conjugated linoleic acid (CLA) has been noted for promoting effects on growth, feed efficiency and body composition of fish, thus improving the final production. For human health, many studies that use of CLA, have been conducted on the basis of its beneficial effects, mainly for their anticancer action and prevention of obesity. Studies correlating the beneficial effects of consumption of fish meat in control of human diseases, especially circulatory and heart, has also been the target of many researchers. Thus, the possibility of enrichment of the fish meat with conjugated linoleic acid (CLA) is important for the establishment of such recommendations in commercial diets for these species, as well as meat quality, therefore contributing to increased consumption this protein. However, the inclusion levels of CLA in diets for various fish species are not well defined, which could be related to differences in energy metabolism of the species. The lambari-do-rabo-amarelo (Astyanax altiparanae) has good potential for aquaculture due to rapid growth, high prolificacy, short production cycle and wide distribution in nature. The nutritional value of fish meat is associated with protein quality and content of polyunsaturated lipids. Thus, studies that allow for the improvement in the quality of the meat of these species become central to the recommendations of this protein for human consumption. Therefore, this study aimed to evaluate different levels of CLA on growth performance and carcass composition of lambari-do-rabo-amarelo. For this purpose, It was used a completely randomized experimental design with six treatments (0.0, 0.5, 1.0, 1.5, 2.0 and 2.5% CLA), and five repetitions. Lambaris juveniles, with average weight of 1.58 g (± 0.23) were distributed in 30 tanks (containing 70 liters each), equipped with biological filter and constant aeration, density of 19 fish per tank. The fish were fed the test diets, ad libitum, in the hours of 8h:00min, 11h:00min, 14h:00min e 17h:00min, for a period of 90 days. At the end of the experiment were analyzed the following zootechnical parameters: survival rate, weight gain, specific growth rate, feed conversion, carcass yield and viscerossomático, gonadosomatic and hepatosomatic indices. The fish of the different treatments were also analyzed for chemical composition and fatty acid profile of the carcass. The data were evaluated by analysis of variance, at 5% significance level. There was no statistical difference between the parameters of growth performance and carcass composition of fish of different treatments. However, with respect to the fatty acid profile, fish reflected the lipid composition of the diets, CLA significantly influences (p <0.05) the concentration of animal carcass fatty acids 15:1n-7, 16:00, 16:1n-9, 16:1n-5, 18:1n-9, 18:2n-6, 18:3n-3, 18:2 (c9,t11) and 18:2 (t11,c12), 20:1n-9, 22:1n-9, 20:5n-3 and 22:4n-6, also the CLA total sum, sum of saturated fatty acids (SFA), monounsaturated (MUFA) and polyunsaturated (PUFA) n-6 and n-3 series. Therefore, we conclude that for this stage of development, provision of CLA in the diet may reflect the incorporation of this fatty acid in the tissues of the lambari-do-rabo-amarelo (Astyanax altiparanae), being recommended as a functional food for improving human health.