Levels of digestible protein to surubim (Pseudoplatystoma sp.) reared in net cages

• Published in: Semina. Ciências agrárias : revista cultural e científica da Universidade Estadual de Londrina Vol. 35; no. 5; pp. 2781 - 2792
• Main Authors: Claucia Aparecida Honorato, Thiago Tetsuo Ushizima, Carolina Isabel Isabel Flores Quintana, Cristiane Meldau de Campos, Vanessa Menegatti Marcondes, Camila Aparecida Nascimento, Fábio Mazzotti Santamaria
• Format: Journal Article
• Language: English; Portuguese
• Published: Universidade Estadual de Londrina 01-10-2014
• Subjects: Neotropical species; Protein sources; Fish nutrition; Carnivorous fish
• ISSN: 1676-546X; 1679-0359
• DOI: 10.5433/1679-0359.2014v35n5p2781

The Pseudoplatystoma sp. is species of carnivorous fish that require special attention in the diet offered. This work had the objective to determine the digestible protein requirement of juvenile the Pseudoplatystoma sp. reared in net cages. The test consisted of four isoenergetic diets (2606.69 ± 39.16 kcal kg-1 of digestible energy) containing increasing levels of digestible protein (23, 24, 26 and 28%PD) provided to juveniles of surubim (157.35±11.23g) for five months. The parameters of growth, fillet composition, metabolic liver enzymes and morphometry of the intestine and liver were analyzed in completely randomized design with four treatments and four replicates. An increase of protein in the diet provided better weight gain. The metabolic liver enzymes increased in fish fed 24PD. The histopathological changes were not observed in the liver of the fish. The bowel histology showed adaptation to increased protein in the diet until the 26 level PD. juveniles of Pseudoplatystoma sp. Were demanding in digestible protein, showing the best results of production performance and nutrient use efficiency with the diet containing 28%PD.