Behaviour of Atlantic salmon smolts approaching a bypass under light and dark conditions: Importance of fish development
The development of passage systems for migratory fish is crucial to mitigate the impact of river fragmentation. Concerning downstream migration of juvenile salmon (smolts), understanding their behaviour is a key to improving the efficiency of bypass systems. Among devices to improve efficiency, arti...
Published in: | Ecological Engineering |
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2019
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Online Access: | https://oatao.univ-toulouse.fr/25545/ https://oatao.univ-toulouse.fr/25545/1/Tetard_25545.pdf https://doi.org/10.1016/j.ecoleng.2019.02.021 |
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ftunivtoulouseoa:oai:oatao.univ-toulouse.fr:25545 2023-05-15T15:31:49+02:00 Behaviour of Atlantic salmon smolts approaching a bypass under light and dark conditions: Importance of fish development Tétard, Stéphane Maire, Anthony Lemaire, Marine De Oliveira, Eric Martin, Patrick Courret, Dominique Centre National de la Recherche Scientifique - CNRS (FRANCE) EDF (FRANCE) Institut National Polytechnique de Toulouse - INPT (FRANCE) Institut National de la Recherche Agronomique - INRA (FRANCE) Université Toulouse III - Paul Sabatier - UT3 (FRANCE) Agence Française pour la Biodiversité - AFB (FRANCE) Conservatoire National du Saumon Sauvage - CNSS (FRANCE) Université de Savoie Mont Blanc - USMB (FRANCE) Institut de Mécanique des Fluides de Toulouse - IMFT (Toulouse, France) 2019-06 application/pdf https://oatao.univ-toulouse.fr/25545/ https://oatao.univ-toulouse.fr/25545/1/Tetard_25545.pdf https://doi.org/10.1016/j.ecoleng.2019.02.021 en eng https://oatao.univ-toulouse.fr/25545/1/Tetard_25545.pdf Tétard, Stéphane and Maire, Anthony and Lemaire, Marine and De Oliveira, Eric and Martin, Patrick and Courret, Dominique. Behaviour of Atlantic salmon smolts approaching a bypass under light and dark conditions: Importance of fish development. (2019) Ecological Engineering, 131. 39-52. ISSN 0925-8574 info:eu-repo/semantics/openAccess Biodiversité et Ecologie Ingénierie de l'environnement Ecosystèmes Mécanique des fluides Atlantic salmon Smolt Downstream migration Bypass efficiency Article PeerReviewed info:eu-repo/semantics/article 2019 ftunivtoulouseoa https://doi.org/10.1016/j.ecoleng.2019.02.021 2020-03-24T23:26:33Z The development of passage systems for migratory fish is crucial to mitigate the impact of river fragmentation. Concerning downstream migration of juvenile salmon (smolts), understanding their behaviour is a key to improving the efficiency of bypass systems. Among devices to improve efficiency, artificial lighting has proved effective in certain situations. Based on (1) recent observations of early migrating smolts where migration was delayed in the Poutès dam reservoir (Allier River, France) and (2) the fact that the implementation of bypass lighting devices was based on experiments involving later-season migrants, the present study assessed the effect of a lighting device on wild early-migrating smolts. One hundred wild smolts were tagged with acoustic transmitters and their behaviour near the bypass entrance under lit or dark conditions was assessed using 2D acoustic telemetry. A very abrupt change in behaviour around mid-April was observed, which directly affected their response to light. In the first phase of the downstream migration season (before mid-April), lighting significantly reduced the attractiveness of the bypass, while this surprisingly seemed to favour passage: smolts less frequently approached the bypass entry zone but passed through it more frequently. However, in the second phase (after mid-April), lighting attracted and kept the smolts close to the bypass entrance and significantly increased passage, corroborating previous experiments. The present study demonstrated an interaction between the development of migratory fish and their behaviour under lit or dark conditions. It also highlighted the importance of taking account of such behavioural change during the migration season when designing fish passage systems. Article in Journal/Newspaper Atlantic salmon OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) Ecological Engineering 131 39 52 |
institution |
Open Polar |
collection |
OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) |
op_collection_id |
ftunivtoulouseoa |
language |
English |
topic |
Biodiversité et Ecologie Ingénierie de l'environnement Ecosystèmes Mécanique des fluides Atlantic salmon Smolt Downstream migration Bypass efficiency |
spellingShingle |
Biodiversité et Ecologie Ingénierie de l'environnement Ecosystèmes Mécanique des fluides Atlantic salmon Smolt Downstream migration Bypass efficiency Tétard, Stéphane Maire, Anthony Lemaire, Marine De Oliveira, Eric Martin, Patrick Courret, Dominique Behaviour of Atlantic salmon smolts approaching a bypass under light and dark conditions: Importance of fish development |
topic_facet |
Biodiversité et Ecologie Ingénierie de l'environnement Ecosystèmes Mécanique des fluides Atlantic salmon Smolt Downstream migration Bypass efficiency |
description |
The development of passage systems for migratory fish is crucial to mitigate the impact of river fragmentation. Concerning downstream migration of juvenile salmon (smolts), understanding their behaviour is a key to improving the efficiency of bypass systems. Among devices to improve efficiency, artificial lighting has proved effective in certain situations. Based on (1) recent observations of early migrating smolts where migration was delayed in the Poutès dam reservoir (Allier River, France) and (2) the fact that the implementation of bypass lighting devices was based on experiments involving later-season migrants, the present study assessed the effect of a lighting device on wild early-migrating smolts. One hundred wild smolts were tagged with acoustic transmitters and their behaviour near the bypass entrance under lit or dark conditions was assessed using 2D acoustic telemetry. A very abrupt change in behaviour around mid-April was observed, which directly affected their response to light. In the first phase of the downstream migration season (before mid-April), lighting significantly reduced the attractiveness of the bypass, while this surprisingly seemed to favour passage: smolts less frequently approached the bypass entry zone but passed through it more frequently. However, in the second phase (after mid-April), lighting attracted and kept the smolts close to the bypass entrance and significantly increased passage, corroborating previous experiments. The present study demonstrated an interaction between the development of migratory fish and their behaviour under lit or dark conditions. It also highlighted the importance of taking account of such behavioural change during the migration season when designing fish passage systems. |
author2 |
Centre National de la Recherche Scientifique - CNRS (FRANCE) EDF (FRANCE) Institut National Polytechnique de Toulouse - INPT (FRANCE) Institut National de la Recherche Agronomique - INRA (FRANCE) Université Toulouse III - Paul Sabatier - UT3 (FRANCE) Agence Française pour la Biodiversité - AFB (FRANCE) Conservatoire National du Saumon Sauvage - CNSS (FRANCE) Université de Savoie Mont Blanc - USMB (FRANCE) Institut de Mécanique des Fluides de Toulouse - IMFT (Toulouse, France) |
format |
Article in Journal/Newspaper |
author |
Tétard, Stéphane Maire, Anthony Lemaire, Marine De Oliveira, Eric Martin, Patrick Courret, Dominique |
author_facet |
Tétard, Stéphane Maire, Anthony Lemaire, Marine De Oliveira, Eric Martin, Patrick Courret, Dominique |
author_sort |
Tétard, Stéphane |
title |
Behaviour of Atlantic salmon smolts approaching a bypass under light and dark conditions: Importance of fish development |
title_short |
Behaviour of Atlantic salmon smolts approaching a bypass under light and dark conditions: Importance of fish development |
title_full |
Behaviour of Atlantic salmon smolts approaching a bypass under light and dark conditions: Importance of fish development |
title_fullStr |
Behaviour of Atlantic salmon smolts approaching a bypass under light and dark conditions: Importance of fish development |
title_full_unstemmed |
Behaviour of Atlantic salmon smolts approaching a bypass under light and dark conditions: Importance of fish development |
title_sort |
behaviour of atlantic salmon smolts approaching a bypass under light and dark conditions: importance of fish development |
publishDate |
2019 |
url |
https://oatao.univ-toulouse.fr/25545/ https://oatao.univ-toulouse.fr/25545/1/Tetard_25545.pdf https://doi.org/10.1016/j.ecoleng.2019.02.021 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_relation |
https://oatao.univ-toulouse.fr/25545/1/Tetard_25545.pdf Tétard, Stéphane and Maire, Anthony and Lemaire, Marine and De Oliveira, Eric and Martin, Patrick and Courret, Dominique. Behaviour of Atlantic salmon smolts approaching a bypass under light and dark conditions: Importance of fish development. (2019) Ecological Engineering, 131. 39-52. ISSN 0925-8574 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.ecoleng.2019.02.021 |
container_title |
Ecological Engineering |
container_volume |
131 |
container_start_page |
39 |
op_container_end_page |
52 |
_version_ |
1766362330027786240 |