Desempenho zootecnico de alevinos de tilápia do Nilo (Oreochromis niloticus) alimentados com ração comercial enriquecida com a cianofícea Spirulina platensis

Abstract

The ease of reproduction, use of cages, breeding, acceptance of artificial food from the larval stage, management resistance and low oxygen levels, and have a quality steak with a good acceptance by the consumer, is Tilapia is one of the most farmed fish in the world. Spirulina platensis is a photosynthetic cyanobacterium that contains lots of iron, vitamins, fatty acids (omega 3 and 6), minerals, all essential amino acids, pigments (carotenoids, chlorophyll phycocyanin), does not contain cellulose, which makes the easy digestibility and assimilation by the body, reaching about 65% protein by dry weight. Thus, spirulina has a great potential to be incorporated into the feed and provide a rapid growth of the fish, due to their high nutritional value. The objective of the study was to evaluate the growth performance of tilapia fingerlings reversed, fed commercial feed enriched with flour Spirulina platensis. The experiment lasted 56 days, we used 120 fish, aquariums stocked in forty-five liters at a density of 1.0 tilapia L3, with weight and average length of (0.29 ± 0.07 g) and (2.59 ± 0.22 cm) respectively, were two employees treatments with four replications, in the first fry were fed commercial diets with 28% CP enriched with 30% of flour S. platensis and second were fed commercial diet with 32% CP without Spirulina. At the end of the experiment highest growth in average weight and length was observed in tilapia fed with Spirulina, Coming to submit these average weight of 7.30 ± 0.5ge average length of 7.6 ± 0.24 cm. Also improved performance was observed in the specific growth rate, biomass gain and average weight gain per day. Therefore, the use of Spirulina shows a contribution to a better development of tilapia.