In aquaculture, the survival of fish postlarvae is influenced by food. The gamitana, Colossoma macropomum Cuvier, 1816, is a species of great economic importance in our country. In the present work, the growth of gamitana C. macropomum postlarvae was evaluated, subjected to three feeding treatments: T1, live food composed of brine shrimp nauplii; T2, food composed of brine shrimp nauplii plus microencapsulated experimental food and T3, only microencapsulated experimental food. Food was provided "ad libitum" and postlarvae growth, specific growth rate, weight gain and survival rate were evaluated. The microencapsulated food was prepared by the gelling, drying and grinding technique. The experiment lasted 30 days. 450 gamitana postlarvae with initial average size of 0.02 ± 0.012 cm distributed in nine aquariums were used. The experimental design was completely randomized with three treatm...

The inclusion of biological silage from chicken intestines and blood in the feed for Nilotic tilapia Oreochromis niloticus, substituting 80% of the protein content of fishmeal, was evaluated. The silages were made with 70% waste, 15% energy source (14% molasses and 1% sugar) and 15% yogurt (lactic acid bacteria). The pH and acidity were determined for 180 days, and the chemical analysis was done using standard methods. The base diet was formulated with the minimum cost equation, and considering the nutritional requirements for tilapia, inclusion levels and cost of inputs. A control diet and two with silages were used. The fingerlings (n=270) with an initial weight of 5.17 ± 0.18 g were randomly distributed in nine aquariums (3 per diet). The fish were fed three times a day and evaluated monthly. A significant difference (p<0.05) was found in the final weight and biomass averages betw...