Fontes de lipídios para juvenis de trairão (Hoplias lacerdae). / Sources of lipids for juvenile trairão (Hoplias lacerdae)

AUTOR(ES)

Thiago Rota Alves Felipe

DATA DE PUBLICAÇÃO

2009

RESUMO

This study aimed to evaluate diets with different oil sources on juveniles of trairão (Hoplias lacerdae). Experimental design was completely randomized with five replications and four treatments (oils: canola, flaxseed, soybean and olive oils). Treatments were isonitrogenous (42% PB) and isocaloric (4569.29 kcal EB/kg), differing only in the source of oil. Juvenile trairões with average 4.77 1.40 cm standard length and 1.97 0.21 g weight were divided into 20 tanks (35 x 30 x 14 cm) at 1.14 fish / L density. Aquaria were equipped with biological filter, constant aeration and heating system adjusted to 26 1.0 C. The aquaria were covered with black screen of two millimeters of opening to prevent fish to escape, and 12-hour photoperiod. Fish were fed daily at 8:00, 13:00 and 17:00 and behavior of feeding, aggression and cannibalism. Were recorded after 50 days biometry was performed on animals for the assessment of after: gains in length and weight, specific growth rate, feed conversion and survival rate. After biometrics, three fish per replicate of each treatment were billed and eviscerated for analysis of fatty acid profile. The results of the zootechnical indices and fatty acid profile were evaluated by analysis of variance and means were compared with Scottt-Knott 5% probability criterion. All treatments yielded 100% survival and absence of cannibalism. There was no aggressive and dominance behavior among the fish. Other zootechnical showed no statistical differences among treatments. The fatty acid profile of the animals followed the fatty acid profile of their diets. We concluded that fish densities were suitable for survival and that all sources of vegetable oils were appropriate for nutrition and health of juvenile trairões.

ASSUNTO(S)

α sources of vegetable oils polyunsaturated fatty acids Ácido graxo α fatty acid profile fontes de óleo vegetal perfil de ácidos graxos aquicultura carnivorous fish Ácido graxo linoléico -polyunsaturated fatty acids -linoléico peixes carnívoros

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