Avaliação da composição da carcaça do beijupirá (rachycentron canadum) alimentados com resíduo da indústria camaroneira

Abstract

Order to decrease feed cost and ambiental impact, were prepared in these study isonitrogenous (48%) and isoenergetic (4,200 kcal / kg) diets, using as protein source white shrimp waste acid silage in five inclusion levels (0, 4, 8, 12 and 16%). Sixty juvenile cobia (Rachycentron canadum) (99 ± 8.24g), were randomly distributed into each of 15 tanks of 250 liters and fed one of five diets, in three replicates, in recirculation unit system, for 45 days. Body proximate composition was evaluated at the end of experiment and the percent moisture (76.33-78.46%), ash (1.36-1.42%), proteins (17.86-19.82%) and dry matter (21.54-23.03%) were similar to those reported in literature. Total lipids content showed greater variation (0.59-1.83%) and fish received diet with 12% silage had highest levels (1.83%). Were identified 21 fatty acid (FA), and linoleic (C18:2ω6c; 27.32-38.89%), oleic (C18:1ω9c; 21.76-22.82%) and palmitic (C16:0; 15.22-16.29%) acids were majority. Cobia fed diets containing 12% inclusion silage had higher concentrations of monounsaturated fatty acids (521.50 mg/100g), polyunsaturated fatty acids (PUFA) (858.61 mg/100g), EPA and DHA pool (73.19mg/100g), ω-3 PUFA (130.45 mg/100g), saturated fatty acids (SFA) (423.99 mg/100g) and ratio PUFA/SFA (2.03). Juveniles fed conventional diet had the lowest concentrations of ω-6 PUFA (173.14 mg/100g), SFA (164.10 mg/100g) and lower ratio ω-6: ω-3 PUFA (3.14) that others. Shrimp waste silage may be used in diets for cobia without interference on the body proximate composition, may also to improve nutritional value through modification of fatty acids profile in fillet.