Effects of feeding meal of fish filleting industrial waste as protein and mineral source for Nile tilapia (Oreochromis niloticus L.) fries

The effects of feeding meal of tilapia filleting industrial waste (FW) on performance and body composition for Nile tilapia fry were evaluated. One hundred and twenty Nile tilapia fries (averaging initial weight and length of 0.58 +/- 0.05 g and 3.49 +/- 0.09 em, respectively) were assigned to 24 30L-aquariums. The experiment was analyzed a complete randomized design with four treatments and six replications. Diets contained 30% of digestible protein and 3,000 kcal/kg of digestible energy. The following treatments were used: CO - corn and soybean meal-based diets, with no phosphorus supplement; BF - corn and soybean meal-based diets, with phosphorus supplement (dicalcium phosphate); BF+FW - half FW-based diets, with half of phosphorus supplement (dicalcium phosphate); FT corn and soybean mea-based diets, with FW. At the end of this trial, the best results of performance were reported for animals fed P supplements-based diets. Animals fed CO-based meal showed the highest rate of body fat and the lowest of ash, Ca and P. FW-based diets can be used as P source for Nile tilapia fry, with no changes on performance and body composition.