Increasing Dip Net Mesh Size Results in More Fin Splits in Post-Smolt Atlantic Salmon ().

Dip nets are widely used to retrieve fish from the water but can cause injuries to the fish. The objective of this study was to document the potential effects of dip net mesh size with respect to external injuries, more specifically fin splits and scale losses, in Atlantic salmon (). The study included 273 post-smolt Atlantic salmon from two fish batches referred to as the Tank group ( = 178 ± 36 g, = 198) and the Cage group ( = 1319 ± 334 g, = 75).

Sudden exposure to warm water causes instant behavioural responses indicative of nociception or pain in Atlantic salmon.

Thermal treatment has become the most used delousing method in salmonid aquaculture. However, concerns have been raised about it being painful for the fish. We studied the behavioural response of Atlantic salmon acclimated to 8 °C when transferred to temperatures in the range 0-38 °C.