Swimming is an integral part of the behavior of many species of fish and is accomplished through the contractile activity of skeletal muscle. In turn, swimming-induced contractile activity modulates the skeletal muscle phenotype. In salmonid fish, swimming under sustainable speeds may promote somatic growth by a complex interaction of factors including increased feed intake, feed conversion and nutrient utilization rates, as well as contraction-induced adaptive mechanisms at the molecular and cellular levels in skeletal muscle. In this talk, I will discuss recent data from my laboratory on the transcriptomic response of skeletal muscle to swimming-induced activity in rainbow trout (Oncorhynchus mykiss) using microarray analysis and RNAseq.
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