A comparative study of the metabolic response in rainbow trout and Nile tilapia to changes in dietary macronutrient composition

Metabolic mechanisms underlying the divergent response of rainbow trout ( Oncorhynchus mykiss ) and Nile tilapia ( Oreochromis niloticus ) to changes in dietary macronutrient composition were assessed. Fish were fed one of four isoenergetic diets having a digestible protein-to-digestible energy (DP:DE) ratio above or below the optimal DP:DE ratio for both species. At each DP:DE ratio, fat was substituted by an isoenergetic amount of digestible...