Desempenho, sanidade animal e qualidade de filés de tilápias alimentadas com ração suplementada com biomassa bacteriana
Alternative titlePerformance, animal health and fillets quality of tilapia fed diets supplemented with bacterial biomass
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Modern aquaculture is one of the fastest growing food sectors in the world. Beyond having productivity advantages, tilapia fish yields products with great market acceptance. For its nutrition, additives aiming at increasing zootechnical, pigmenting or antioxidant features may be used. This study aimed to evaluate the effect of the supplementation of tilapia diets with Rubrivivax gelatinosus biomass on the performance and the health of animals (histology and hematology), and on the quality of fillets (pH, proximate composition, color and rancidity). The experiment comprised six treatments, made of a control group with no additives, a group containing commercial pigments and four groups with biomass at 175, 350, 700 and 1400 mg/kg. Fish weighing 21.42±5.65g were reared for 74 days in a system with water recirculation and slaughtered for analyzes. No differences were detected for performance, histological and hematological analyzes. Fillets of the groups fed additives had lower moisture content than the control group while the fillets of the groups fed the biomass had the highest protein percentages. No differences were detected among treatments for pH, lipids and ash values. Regarding to the color of the fillets, all treatments with additives increased redness. For all treatments, rancidity in the fillets increased during storage, although the groups treated with the highest biomass concentrations had the lowest values. R. gelatinosus biomass did not change performance and animal health, and proved to be capable of improving fillets quality features and conservation.
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