The objective of this work was to evaluate the effect of three commercial feeds recommended for carnivorous fish on processing yield and fillet composition of surubim (Pseudoplatystoma sp) raised in net cages. The surubim fishes were raised in net cages during one year, when were fed three diets with 43.5, 42.6, and 42.1% crude protein; 6.3, 8.7, and 4.5% ether extract and 5,078, 4,931, and 4,994 kcal of gross energy, respectively. Fishes were allotted to a completely randomized design, with three treatments and three replicates. Five surubim fishes weighing from 1280 to 1340g were selected from each cage and unsensibilized and slaughtered for posterior determination of the processing yields of carcass with and without skin, head, total fillet, lateral and abdominal fillets, liver, skin and skeleton. Samples of lateral and abdominal fillets were colleted to determine their chemical analyses. No differences were observed between sexes for the principal processing yields, in a total of 22 females and 23 males. There was difference in the abdominal fillet and of the residues with and without skin among diets. There was difference in the abdominal fillet and of the residues with and without skin among diets. The use of different commercial diets during the raising period did not affect the amount and quality of principal edible cuts of surubim fish.
cage; dressing out; Pseudoplatystoma; surubim; yield
