A comparison of the swimming and cardiac performance of farmed and wild Atlantic salmon, Salmo salar, before and after gamete stripping

Abstract

Farmed Atlantic salmon, Salmo salar, frequently escape from the aquaculture industry and interact with wild populations. The impact of these interactions on the wild populations will depend, in part, on differences in their performances. This study compared the swimming and cardiac performance of farmed salmon (Aquagen) with their founder population from the River Namsen both before and after gamete stripping. Cardiac output (CO), heart rate (HR), and stroke volume (SV), which were measured by placing Doppler flow probes around the ventral aorta of the fish, increased with exercise, but the response did not significantly differ between farmed and wild salmon. Similarly, the swimming performance of wild salmon never significantly differed from the farmed salmon. The overall similarity in swimming and cardiac performance between farmed and wild Atlantic salmon observed in the present study suggests that cultured salmon may have the ability to be competitive with the wild salmon in native waters.