Optimization of dietary macronutrients for Atlantic salmon post-smolts using increasing ration levels

The diminishing returns in protein growth as intake of diet 40/26 increased suggest that the dietary amino acid level was not high enough to elicit further protein gain. Diet 60/18 led to numerically higher growth rates, but diet 49/26 resulted in lower DP maintenance and higher efficiency of utilization of DP for growth above maintenance than diet 60/18. Thus, the results obtained with full-fed fish and those generated using the RRL technique, seem to indicate that diet 49/26 contains more optimal dietary nutrient and energy levels for post-smolts.