Evaluation of a fine-spaced angled rack with surface bypass in providing safe and timely downstream passage for salmon smolts and silver eels
Hydropower production can cause migration delay and fish mortality, impeding the safe and timely downstream migration of diadromous fish, such as Atlantic salmon (Salmo salar) and silver eels (Anguilla anguilla). To date, only a few field performance tests, especially for eels, have evaluated the ef...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2023-01-01
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| Series: | Knowledge and Management of Aquatic Ecosystems |
| Subjects: | |
| Online Access: | https://www.kmae-journal.org/articles/kmae/full_html/2023/01/kmae230052/kmae230052.html |
| _version_ | 1797634780608593920 |
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| author | Tétard Stéphane Courret Dominique Tissot Laurence Richard Sylvain Lagarrigue Thierry Frey Aurélien Mataix Vincent Mercier Olivier Tomanova Sylvie |
| author_facet | Tétard Stéphane Courret Dominique Tissot Laurence Richard Sylvain Lagarrigue Thierry Frey Aurélien Mataix Vincent Mercier Olivier Tomanova Sylvie |
| author_sort | Tétard Stéphane |
| collection | DOAJ |
| description | Hydropower production can cause migration delay and fish mortality, impeding the safe and timely downstream migration of diadromous fish, such as Atlantic salmon (Salmo salar) and silver eels (Anguilla anguilla). To date, only a few field performance tests, especially for eels, have evaluated the efficiency of fine-spaced angled racks associated to a surface bypass entrance to protect fish. Here, 115 salmon smolts and 65 silver eels were radio-tracked over a 2 yr period to assess passage efficiency and passage time at a hydropower intake (50 m3.s−1) retrofitted with a 20 mm rack associated to a surface bypass (2 m3.s−1). Results showed high impediment (89.6% and 96.9% for smolts and eels, respectively), and passage efficiency for the angled rack (89.1% and 93.3%), with short passage times (median, 3 and 7.5 min). However, our results highlighted a strong influence of hydrological conditions, in enhancing fish passage, especially through the bear-trap gate. We conclude that this fish passage solution, making use of existing spillways on the study site, is highly effective for both species. Special attention must, however, be paid to bar-rack design and its cleaning system to ensure fish guidance and prevent impingement or passage through the rack, especially for salmon smolts. |
| first_indexed | 2024-03-11T12:12:21Z |
| format | Article |
| id | doaj.art-0bc6ecaf4256402a8217641675eea7db |
| institution | Directory Open Access Journal |
| issn | 1961-9502 |
| language | English |
| last_indexed | 2024-03-11T12:12:21Z |
| publishDate | 2023-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Knowledge and Management of Aquatic Ecosystems |
| spelling | doaj.art-0bc6ecaf4256402a8217641675eea7db2023-11-07T10:31:14ZengEDP SciencesKnowledge and Management of Aquatic Ecosystems1961-95022023-01-0104242510.1051/kmae/2023020kmae230052Evaluation of a fine-spaced angled rack with surface bypass in providing safe and timely downstream passage for salmon smolts and silver eelsTétard Stéphane0Courret Dominique1Tissot Laurence2Richard Sylvain3Lagarrigue Thierry4Frey Aurélien5Mataix Vincent6Mercier Olivier7Tomanova Sylvie8ICEO − 220 Rue des AilesOffice français de la biodiversité − Direction de la recherche et de l'appui scientifique, Pôle R&D Ecohydraulique OFB-IMFT-PPRIME, IMFT, 2 Allée du Professeur Camille SoulaEDF R&D LNHE - Laboratoire National d'Hydraulique et Environnement, 6 Quai WatierOffice français de la biodiversité, Direction de la police et du permis de chasser, Service prévention appui prospective, Pôle R&D Ecohydraulique OFB-IMFT-PPRIME, IMFT, 2 Allée du Professeur Camille SoulaECOGEA, 352 avenue Roger TissandiéECOGEA, 352 avenue Roger TissandiéEDF CIH - EDF CIH, Pôle Énergies Renouvelables, 4 rue Claude Marie Perroud, bâtiment COffice français de la biodiversité − Direction de la recherche et de l'appui scientifique, Pôle R&D Ecohydraulique OFB-IMFT-PPRIME, IMFT, 2 Allée du Professeur Camille SoulaOffice français de la biodiversité − Direction de la recherche et de l'appui scientifique, Pôle R&D Ecohydraulique OFB-IMFT-PPRIME, IMFT, 2 Allée du Professeur Camille SoulaHydropower production can cause migration delay and fish mortality, impeding the safe and timely downstream migration of diadromous fish, such as Atlantic salmon (Salmo salar) and silver eels (Anguilla anguilla). To date, only a few field performance tests, especially for eels, have evaluated the efficiency of fine-spaced angled racks associated to a surface bypass entrance to protect fish. Here, 115 salmon smolts and 65 silver eels were radio-tracked over a 2 yr period to assess passage efficiency and passage time at a hydropower intake (50 m3.s−1) retrofitted with a 20 mm rack associated to a surface bypass (2 m3.s−1). Results showed high impediment (89.6% and 96.9% for smolts and eels, respectively), and passage efficiency for the angled rack (89.1% and 93.3%), with short passage times (median, 3 and 7.5 min). However, our results highlighted a strong influence of hydrological conditions, in enhancing fish passage, especially through the bear-trap gate. We conclude that this fish passage solution, making use of existing spillways on the study site, is highly effective for both species. Special attention must, however, be paid to bar-rack design and its cleaning system to ensure fish guidance and prevent impingement or passage through the rack, especially for salmon smolts.https://www.kmae-journal.org/articles/kmae/full_html/2023/01/kmae230052/kmae230052.htmlsalmo salaranguilla anguillafish passage solutionhydropowerdownstream migration |
| spellingShingle | Tétard Stéphane Courret Dominique Tissot Laurence Richard Sylvain Lagarrigue Thierry Frey Aurélien Mataix Vincent Mercier Olivier Tomanova Sylvie Evaluation of a fine-spaced angled rack with surface bypass in providing safe and timely downstream passage for salmon smolts and silver eels Knowledge and Management of Aquatic Ecosystems salmo salar anguilla anguilla fish passage solution hydropower downstream migration |
| title | Evaluation of a fine-spaced angled rack with surface bypass in providing safe and timely downstream passage for salmon smolts and silver eels |
| title_full | Evaluation of a fine-spaced angled rack with surface bypass in providing safe and timely downstream passage for salmon smolts and silver eels |
| title_fullStr | Evaluation of a fine-spaced angled rack with surface bypass in providing safe and timely downstream passage for salmon smolts and silver eels |
| title_full_unstemmed | Evaluation of a fine-spaced angled rack with surface bypass in providing safe and timely downstream passage for salmon smolts and silver eels |
| title_short | Evaluation of a fine-spaced angled rack with surface bypass in providing safe and timely downstream passage for salmon smolts and silver eels |
| title_sort | evaluation of a fine spaced angled rack with surface bypass in providing safe and timely downstream passage for salmon smolts and silver eels |
| topic | salmo salar anguilla anguilla fish passage solution hydropower downstream migration |
| url | https://www.kmae-journal.org/articles/kmae/full_html/2023/01/kmae230052/kmae230052.html |
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