Metabolic Consequences of Lipid Suppression on Carbohydrate Tolerance and Growth Performance in Rainbow Trout (Oncorhynchus Mykiss)
Salmon and trout provide a unique challenge to aquaculture because of their inability to utilize significant amounts of dietary carbohydrate for energy production and growth. The purpose of this project is to determine whether inclusion of supplementary niacin (a natural vitamin) in the diet of rainbow trout can promote carbohydrate utilization. Specific objectives of this project include 1) to determine whether dietary supplementation with niacin improves growth performance when rainbow trout receive a carbohydrate-enriched diet; and 2) establish if dietary supplementation with niacin promotes carbohydrate uptake and metabolism in liver and muscle tissues. Given that fish meal and oil are currently major components of feed for cultured carnivorous fishes like trout, substitution of carbohydrates for fish protein or lipid would provide
substantial economic savings and reduce the impact on wild fish populations that are already exploited near their maximum sustainable levels. Incorporation of more carbohydrates and less fish protein in the diet would also reduce environmental pollution by reducing the flux of nitrogen and phosphorous from aquaculture facilities.