Extrato hidroalcoólico de rosella (Hibiscus sabdariffa l.) na alimentação do peixe mato grosso (Hyphessobrycon eques)

Abstract

This study evaluated the inclusion of hydroalcoholic rosella extract (Hibiscus sabdariffa) in diets of the thickbush fish (Hyphessobrycon eques). A hundred and twenty fishes (0.51± 0.06 g), were randomly distributed in 12 polyethylene aquariums of 20L, in a water recirculation system, with the storage density of 10 fish per aquarium. Fish were fed for 21 days per diet (40.88% CP and 4374.8 Kcal kg-1), plus rosella alcohol extract - EHR (control; 0.12; 0.25 and 0.50mg of EHR/kg of feed). The inclusion of concentrations of 0.25 and 0.50 EHR/kg promoted an improvement in zootechnical indices, in standard length and feed efficiency. The fish presented alteration of chroma a*(shades of green and red), there was no increase in intensity in relation to chroma b* luminosity (shades of blue and yellow). The use of 0.25 and 0.50 EHR/kg reflected decreased activity of AST and ALT enzymes. An increase in catalase activity was observed in concentrations with higher rates of hydroalcoholic rosella extracts in the diet. The hydroalcoholic extract of rosella is efficient in feeding Mato Grosso at the concentration of 0.25 mg EHR/kg.