Increasing Dip Net Mesh Size Results in More Fin Splits in Post-Smolt Atlantic Salmon (<i>Salmo salar</i>)

Moltumyr, Lene; Stien, Lars Helge; Madaro, Angelico; Nilsson, Jonatan

doi:10.1080/10888705.2022.2152689

Cited by 2 publications

(2 citation statements)

References 34 publications

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“…Scale loss and fin splitting can be reduced by using smaller mesh sizes and rubber-coated mesh when collecting fish with dip nets (Moltumyr et al, 2022;Powell, 2021). However, dip-netting also requires the removal of fish from water into the air, which reduces welfare from air exposure (Cook et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…For example, low recapture rates and survival of hatchery‐reared Atlantic salmon smolts were partly caused by the handling and transport of smolts prior to release in three rivers in western Norway (Iversen et al, 1998). Scale loss and fin splitting can be reduced by using smaller mesh sizes and rubber‐coated mesh when collecting fish with dip nets (Moltumyr et al, 2022; Powell, 2021). However, dip‐netting also requires the removal of fish from water into the air, which reduces welfare from air exposure (Cook et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

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Handling of wild Atlantic salmon smolts reduced marine survival more than hydropower turbine passage

Haraldstad

Johansen

Vollset

2023

Fisheries Management Eco

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Atlantic salmon smolts are sensitive to disturbance during their migration and negative effects experienced in freshwater may carry over into the marine environment. In this study, smolts were PIT‐tagged and detected during their subsequent spawning migration. A generalized linear model fitted to the return data predicted a return probability of 0.091 ± 0.0061 (±SE) for smolt that was released downstream of a hydropower dam. The additional effect of migrating through a Kaplan turbine associated with hydroelectric generation did not significantly reduce return rates, while the additional effect of being handled twice in a trap was significant and lowered the predicted return probability to 0.057 ± 0.0079 (±SE; model predictions from logistic regression). Catch‐mark‐recapture methods such as those using physical recapture of fish should be applied with great care to avoid multiple handling stress that may lead to reduced marine survival and biasing estimates intended to help monitor population statuses. Moreover, similar return rates in turbine and bypass migrating smolts emphasize that more knowledge is needed when evaluating mitigation actions for migratory fish at hydropower plants.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Handling of wild Atlantic salmon smolts reduced marine survival more than hydropower turbine passage

Haraldstad

Johansen

Vollset

2023

Fisheries Management Eco

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Using a novel biologging approach to assess how different handling practices influence the post-release behaviour of Northern Pike across a wide range of body sizes

LaRochelle

Burton

Madden

et al. 2023

Aquat. Living Resour.

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There is a growing body of research focused on how angled fish respond to catch-and-release (C&R). However, most of those studies do not span a wide range of body sizes for the targeted species. Physical injury and physiological responses to C&R can be size-dependent, and methods used for landing fish of different sizes vary. As such, studying the response to C&R across a range of fish sizes may help inform best practices that improve outcomes for released fish. Northern Pike (Esox lucius) widely ranges in body size. Anglers may land them by hand, cradle, or net, and they are often released voluntarily or to comply with regulations. We angled 25 Northern Pike (total length 620–1030 mm) from one population and recorded fight, handling, and unhooking times across landing methods (i.e., hand, cradle, net). Prior to release, a pop-off biologging package was temporarily affixed to each fish to monitor locomotor activity, depth, and water temperature during a 12-h period post-release to understand how the interaction of landing method and body size influenced post-release behaviour and short-term fate. Fight and handling time increased with increasing body size. Northern Pike landed with a cradle or net had shorter fight times but longer handling times, compared to fish landed by hand. Post-release locomotor activity was greater for larger fish and those landed with a net. Fish <775mm and landed by hand had greater locomotor activity than fish landed with a net or cradle, while fish >775mm landed by hand had reduced locomotor activity compared to fish landed with a net. There was no post-release mortality observed. Collectively, anglers should use a net for Northern Pike >775 mm to avoid long fight times and reduce post-release exhaustion, but also attempt to reduce the extent of handling associated with fish landed by net.

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

Cited by 2 publications

References 34 publications

Handling of wild Atlantic salmon smolts reduced marine survival more than hydropower turbine passage

Handling of wild Atlantic salmon smolts reduced marine survival more than hydropower turbine passage

Using a novel biologging approach to assess how different handling practices influence the post-release behaviour of Northern Pike across a wide range of body sizes

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