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

AI Article Synopsis

Article Abstract

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). Four identical dip nets with mesh sizes of 5, 10, 15, and 20 mm, respectively, were used to net fish out of their enclosures before the external injuries were assessed by visual inspection. The results showed that the number and severity of fin splits increased with dip net mesh size, but no effect of mesh size on the percentage of scale losses was found. Dip-netting of five fish at a time instead of one with the 20 mm dip net, had no statistically significant effect on the examined injuries. It is concluded that the use of dip nets with smaller mesh sizes can be positive for fish welfare by reducing fin splitting.

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Source
http://dx.doi.org/10.1080/10888705.2022.2152689DOI Listing

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