Influence of digestible protein levels on growth and feed utilization of juvenile meagreArgyrosomus regius

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.

Growth performance and body composition in response to dietary protein and lipid levels in Nile tilapia (Oreochromis niloticus Linnaeus, 1758) subjected to normal and temporally restricted feeding regimes

“…In this study, we also found that increasing the dietary protein or lipid level could improve feed efficiency, with a combination of the two resulting in the best growth. In contrast, high dietary protein (36%) reduced the protein efficiency ratio vs. low dietary protein (24%), as observed in previous studies with fish including tilapia (Lee et al, 2006;Abdel-Tawwab et al, 2010;Cho, 2011;Velazco-Vargas et al, 2014).…”

Effects of increasing protein level on the performance, enzyme activity and body composition of the Brazilian sardine, Sardinella brasiliensis (Steindachner, 1879)

“…The voluntary feed intake may change to improve feed use and growth (García‐Meilán, Valentín, Fontanillas, & Gallardo, ). Because fish consume food to satisfy their energy requirement (Chaitanawisuti & Rodruang, ), possibly the range of P/E ratio used in the present study was not enough to provoke significant difference in feed consumption and utilization of Brazilian sardine, as well as in meagre Argyrosomus regius fed to increasing levels of protein (Velazco‐Vargas et al., ).…”

“…The dietary protein is broken down into smaller molecules in the gastrointestinal tract, which secrets fluids, electrolytes and digestive enzymes that allow the free amino acids to be absorbed and used (Buddington & Krogdahl, ). A diet that contains protein in excess of fish requirements promotes ammonia excretion and a high use of energy for amino acid catabolism, which can reduce growth rate (Velazco‐Vargas et al., ). On the other hand, low protein dietary content negatively affects fish growth and health.…”

Effects of high‐level fishmeal replacement by plant proteins supplemented with different levels of lysine on growth performance and incidence of systemic noninfectious granulomatosis in meagre ( Argyrosomus regius )

“…In addition, the body and fillet traits of this large species have shown a very high dressing content with a negligible amount of mesenteric and muscular fat in comparison with other cultured fish that makes this species even more interesting for industrial processing and human consumption (Hernández et al, 2009;Poli et al, 2003). As an emerging species for aquaculture, little information is available on the dietary requirements of meagre, including their amino acid requirements, as well as in the development and optimization of sustainable feeds for maximum growth (Chatzifotis, Panagiotidou, & Divanach, 2012;Chatzifotis et al, 2010;Estévez et al, 2011;Velazco-Vargas et al, 2014).…”