Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon ( Salmo salar) smolts migrating through lakes
Abstract Smolt migration through lakes is hazardous, as the predation pressure can be extreme and the hydrology a great contrast to that of a riverine area. However, the mechanisms yielding these challenges have been scarcely investigated. We conducted an acoustic telemetry field study in Lake Evang...
Published in: | Ecology of Freshwater Fish |
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crwiley:10.1111/eff.12641 2024-09-15T17:56:04+00:00 Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon ( Salmo salar) smolts migrating through lakes Hanssen, Erlend M. Vollset, Knut Wiik Salvanes, Anne Gro Vea Barlaup, Bjørn Whoriskey, Kim Isaksen, Trond Einar Normann, Eirik Straume Hulbak, Magnus Lennox, Robert J. Norges Forskningsråd 2021 http://dx.doi.org/10.1111/eff.12641 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12641 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/eff.12641 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Ecology of Freshwater Fish volume 31, issue 2, page 424-437 ISSN 0906-6691 1600-0633 journal-article 2021 crwiley https://doi.org/10.1111/eff.12641 2024-07-18T04:27:01Z Abstract Smolt migration through lakes is hazardous, as the predation pressure can be extreme and the hydrology a great contrast to that of a riverine area. However, the mechanisms yielding these challenges have been scarcely investigated. We conducted an acoustic telemetry field study in Lake Evangervatnet, Voss, Norway, utilising Vemco V5 predation tags. Atlantic salmon ( Salmo salar ) smolts ( N = 20) were tagged with the novel predation sensor tag to investigate mortality, the lacustrine migration behaviour of smolts, and the applicability of these tags for smolt studies. A total of 60% of tagged Atlantic salmon ( Salmo salar ) smolts perished in the lake. Half of the mortalities (30% of tagged fish) were directly attributed to predation by brown trout ( Salmo trutta ) based on predation sensors. The surviving smolts were slow to traverse the 6.5 km lake, with progression rate between lake inlet and outlet on average 0.016 m/s over a mean of 7.9 ± 6.2 (SD) days. Acoustic detections revealed a consistent pattern of nocturnal migration and multidirectional movements within the lake. By running a series of correlated random walks under varying parameters and comparing the simulated travel times to the observed travel time used by the tagged smolts, we emulated the observed behaviour of the smolts. These simulations suggested that smolts lacked the ability to efficiently navigate through the lake, instead swimming in random directions until they reached the lake outlet. Predation sensors can offer improved resolution when tracking the behaviour and fate of smolts and can facilitate better mitigation efforts by identifying survival bottlenecks and separating predation from non‐predatory mortality. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Ecology of Freshwater Fish 31 2 424 437 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Smolt migration through lakes is hazardous, as the predation pressure can be extreme and the hydrology a great contrast to that of a riverine area. However, the mechanisms yielding these challenges have been scarcely investigated. We conducted an acoustic telemetry field study in Lake Evangervatnet, Voss, Norway, utilising Vemco V5 predation tags. Atlantic salmon ( Salmo salar ) smolts ( N = 20) were tagged with the novel predation sensor tag to investigate mortality, the lacustrine migration behaviour of smolts, and the applicability of these tags for smolt studies. A total of 60% of tagged Atlantic salmon ( Salmo salar ) smolts perished in the lake. Half of the mortalities (30% of tagged fish) were directly attributed to predation by brown trout ( Salmo trutta ) based on predation sensors. The surviving smolts were slow to traverse the 6.5 km lake, with progression rate between lake inlet and outlet on average 0.016 m/s over a mean of 7.9 ± 6.2 (SD) days. Acoustic detections revealed a consistent pattern of nocturnal migration and multidirectional movements within the lake. By running a series of correlated random walks under varying parameters and comparing the simulated travel times to the observed travel time used by the tagged smolts, we emulated the observed behaviour of the smolts. These simulations suggested that smolts lacked the ability to efficiently navigate through the lake, instead swimming in random directions until they reached the lake outlet. Predation sensors can offer improved resolution when tracking the behaviour and fate of smolts and can facilitate better mitigation efforts by identifying survival bottlenecks and separating predation from non‐predatory mortality. |
author2 |
Norges Forskningsråd |
format |
Article in Journal/Newspaper |
author |
Hanssen, Erlend M. Vollset, Knut Wiik Salvanes, Anne Gro Vea Barlaup, Bjørn Whoriskey, Kim Isaksen, Trond Einar Normann, Eirik Straume Hulbak, Magnus Lennox, Robert J. |
spellingShingle |
Hanssen, Erlend M. Vollset, Knut Wiik Salvanes, Anne Gro Vea Barlaup, Bjørn Whoriskey, Kim Isaksen, Trond Einar Normann, Eirik Straume Hulbak, Magnus Lennox, Robert J. Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon ( Salmo salar) smolts migrating through lakes |
author_facet |
Hanssen, Erlend M. Vollset, Knut Wiik Salvanes, Anne Gro Vea Barlaup, Bjørn Whoriskey, Kim Isaksen, Trond Einar Normann, Eirik Straume Hulbak, Magnus Lennox, Robert J. |
author_sort |
Hanssen, Erlend M. |
title |
Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon ( Salmo salar) smolts migrating through lakes |
title_short |
Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon ( Salmo salar) smolts migrating through lakes |
title_full |
Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon ( Salmo salar) smolts migrating through lakes |
title_fullStr |
Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon ( Salmo salar) smolts migrating through lakes |
title_full_unstemmed |
Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon ( Salmo salar) smolts migrating through lakes |
title_sort |
acoustic telemetry predation sensors reveal the tribulations of atlantic salmon ( salmo salar) smolts migrating through lakes |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/eff.12641 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12641 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/eff.12641 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Ecology of Freshwater Fish volume 31, issue 2, page 424-437 ISSN 0906-6691 1600-0633 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/eff.12641 |
container_title |
Ecology of Freshwater Fish |
container_volume |
31 |
container_issue |
2 |
container_start_page |
424 |
op_container_end_page |
437 |
_version_ |
1810432276173946880 |