Growth and Muscle Protein Synthesisin vitroof Saithe (Pollachius virens) and Rainbow trout (Salmo gairdneri) in Response to Protein-Energy Intake

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Abstract
Saithe (Pollachius virens) and rainbow trout (Salmo gairdneri) were fed diets containing increasing levels from 12 to 60% of protein energy relative to metabolizable energy for 8 and 3 weeks, respectively. Ribosomes were isolated from skeletal muscle tissue and the rate of protein synthesis in vitro determined. Ribosomal capacity for protein synthesis per g wet weight of muscle tissue was significantly correlated (pr=0.8812, n=56) and rainbow trout (r=0.5722, n=49). Optimal weight gain was reached for saithe at a dietary protein energy level of 40% and for rainbow trout at a 30% level. A dietary ratio of protein energy relative to metabolizable energy of 40–45% was required for optimal protein synthesis in both species.

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