Influence of digestible protein levels on growth and feed utilization of juvenile meagre Argyrosomus regius |
| |
| Authors: | J Velazco‐Vargas A Tomás‐Vidal M Hamdan FJ Moyano López M Jover Cerda S Martínez‐Llorens |
| |
| Institution: | 1. Institute of Animal Science and Technology, Aquaculture and Biodiversity Group, Polytechnic University of Valencia, , Valencia, Spain;2. Departamento Biología Aplicada, Escuela Politécnica Superior, Universidad de Almería, , Almería, Spain |
| |
| Abstract: | This study investigates the effect of digestible protein levels in experimental diets for meagre (Argyrosomus regius). A group of 253 fish, 52 g of mean weight, was distributed in 12 tanks, three replicates per treatment. Four isolipidic diets (170 g kg?1 crude lipid) with different digestible protein levels (350 g kg?1, 430 g kg?1, 490 g kg?1 and 530 g kg?1) were formulated using commercial ingredients. The trial lasted 62 days. Meagre fed diets 430, 490 and 530 g kg?1 obtained higher TGC (2.47, 2.57, 2.69 × 10?3, respectively) than fish fed diet 350 g kg?1 (2.14 × 10?3). Group of fish fed diet with 350 g kg?1 DP showed the lowest ammonia excretion level. According to the in vitro digestibility trial diets with 350 and 430 g kg?1 DP released less amino acids in comparison with diet with 49% DP, although in vivo digestibility test did not show significant differences among diets 430, 490 and 530 g kg?1 DP. Using the quadratic regression, optimal digestible protein intake according to the ECR for rearing juvenile meagre was recorded in 0.8 g DP/100 g fish and day. |
| |
| Keywords: |
Argyrosomus regius
digestible protein levels effects on growth Sciaenidae |
|
|
