Fish performance, metabolic parameters and body composition of rainbow trout fed to satiation with balanced amino acid diet and imbalanced amino acid diet at two levels of water dissolved oxygen: hypoxia <i>vs.</i> normoxia for 42 days.

SEM, Standard error mean; DO, dissolved oxygen; DM, dry matter; DPI, digestible protein intake. Mean values in a row with unlike superscript were significantly different and assigned only if the interaction effect was significant (p<0.05). *Protein retention efficiency (%) = (Wet protein gain/protein intake in dry weight) ×100. **Initial body composition (g kg wet weight−1): 157, protein and 80.5, fat.