Short‐term metabolic responses of gilthead seabream,Sparus aurata, fed diets with different protein and protein: Energy levels

Abstract

Gilthead seabream (Sparus aurata) is an important marine carnivorous fish species reared in the Mediterranean region. Dietary protein and energy requirements for maximum growth of this species are high and within the range reported for other carnivorous species (NRC, 2011;Oliva-Teles, 2000). Dietary protein content for maximum growth of fish depends on the energy (E) level and the amount of non-protein energy (NPE) in the diet (Figueiredo-Silva et al., 2013;Wilson, 2002). Protein is an expensive component of

Amino Acid Metabolism in Gilthead Seabream Is Affected by the Dietary Protein to Energy Ratios

“…For instance, a decrease in dietary P/E ratio by increasing lipid, and consequently energy content, has been shown to have a protein-sparing effect in salmonids [3][4][5]. In addition, it has led to improved growth performance and/or protein efficiency in species such as gilthead seabream, Sparus aurata [6][7][8]; common dentex, Dentex dentex [9]; Nile tilapia, Oreochromis niloticus [10]; Israeli carp, Cyprinus carpio [11]; red-spotted grouper, Epinephelus akaara [12]; and yellow croaker, Larimichthys polyactis [13]. Japanese seabass (Lateolabrax japonicus) fed diets with three levels of protein, at three lipid levels, showed that the protein-sparing effect of lipids was more pronounced in fish fed the diet with the lowest protein content [14].…”