Influence of digestible protein levels on growth and feed utilization of juvenile meagre Argyrosomus regius. (22nd May 2014)

• Record Type: Journal Article
• Authors: Velazco‐Vargas, J.; Tomás‐Vidal, A.; Hamdan, M.; Moyano López, F.J.; Jover Cerda, M.; Martínez‐Llorens, S.
• Is Part Of: Aquaculture nutrition. Volume 20:Number 5(2014:Oct.)
• Page Start: 520
• Page End: 531
• Publication Date: 2014-05-22
• Subjects: Aquaculture -- Periodicals; Aquatic animals -- Feeding and feeds -- Periodicals; Fishes -- Feeding and feeds -- Periodicals; 639.3
• DOI: 10.1111/anu.12105
• Languages: English
• ISSNs: 1353-5773

Abstract

<abstract abstract-type="main" id="anu12105-abs-0001"> <title>Abstract</title> <p>This study investigates the effect of digestible protein levels in experimental diets for meagre (<italic>Argyrosomus regius</italic>). 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 <italic>in vitro</italic> digestibility trial diets with 350 and 430 g kg⁻¹ DP released less amino acids in comparison with diet with 49% DP, although <italic>in vivo</italic> 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.</p> </abstract>