Tests of two types of bypass for downstream migration of eels at a small hydroelectric power plant
International audience Efficiencies of two types of bypass, a surface and a bottom sluice, were tested for the natural downstream migration of silver eels Anguilla anguilla at a small hydroelectric power plant at Halsou, on the River Nive in France. Naturally migrating eels were caught after their p...
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ftccsdartic:oai:HAL:hal-02586721v1 2023-05-15T13:28:03+02:00 Tests of two types of bypass for downstream migration of eels at a small hydroelectric power plant Gosset, Claude Travade, F. Durif, Caroline Elie, Pierre Rives, Jacques Ecologie Comportementale et Biologie des Populations de Poissons (ECOBIOP) Institut National de la Recherche Agronomique (INRA)-Université de Pau et des Pays de l'Adour (UPPA) EDF (EDF) Ecosystèmes estuariens et poissons migrateurs amphihalins (UR EPBX) Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) 2005 https://hal.inrae.fr/hal-02586721 https://doi.org/10.1002/rra.871 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1002/rra.871 hal-02586721 https://hal.inrae.fr/hal-02586721 doi:10.1002/rra.871 IRSTEA: PUB00017797 ISSN: 1535-1459 EISSN: 1535-1467 River Research and Applications https://hal.inrae.fr/hal-02586721 River Research and Applications, Wiley, 2005, 21 (10), pp.1095-1105. ⟨10.1002/rra.871⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2005 ftccsdartic https://doi.org/10.1002/rra.871 2021-10-17T00:03:23Z International audience Efficiencies of two types of bypass, a surface and a bottom sluice, were tested for the natural downstream migration of silver eels Anguilla anguilla at a small hydroelectric power plant at Halsou, on the River Nive in France. Naturally migrating eels were caught after their passage through either bypass. A total of 637 eels were trapped during the three-year study. Total efficiency for both bypasses, evaluated on the basis of downstream movement of radiotagged eels, ranged from 56% to 64%. Given a bias due to hydrological conditions at the time of the runs, the precise efficiency of each separate bypass was not calculated. However, preferred passage through the bottom bypass for both tagged and untagged eels was confirmed by telemetry, as three to four times as many eels transited through the bottom bypass compared to the surface one. The behaviour of 74 individuals released in the forebay was observed by radiotelemetry. Close to half of the radiotagged eels returned up the headrace after their release, and most eventually migrated downstream over the dam with appropriate environmental conditions. Upon arrival at the power plant, eels displayed foraging behaviour in the forebay with frequent displacement interrupted by long resting periods in zones with low current. The repulsive effect of the trashrack located in front of the turbine intake increased with increasing turbined discharge. The study indicated that a trashrack with a smaller bar-spacing (around 20 mm), associated with an appropriate bypass, could deflect a large proportion of the female eels from the turbines. However, this solution needs to be tested on site to quantify the risk of mortality due to impingement on the trashrack Article in Journal/Newspaper Anguilla anguilla Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) River Research and Applications 21 10 1095 1105 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDE]Environmental Sciences |
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[SDE]Environmental Sciences Gosset, Claude Travade, F. Durif, Caroline Elie, Pierre Rives, Jacques Tests of two types of bypass for downstream migration of eels at a small hydroelectric power plant |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Efficiencies of two types of bypass, a surface and a bottom sluice, were tested for the natural downstream migration of silver eels Anguilla anguilla at a small hydroelectric power plant at Halsou, on the River Nive in France. Naturally migrating eels were caught after their passage through either bypass. A total of 637 eels were trapped during the three-year study. Total efficiency for both bypasses, evaluated on the basis of downstream movement of radiotagged eels, ranged from 56% to 64%. Given a bias due to hydrological conditions at the time of the runs, the precise efficiency of each separate bypass was not calculated. However, preferred passage through the bottom bypass for both tagged and untagged eels was confirmed by telemetry, as three to four times as many eels transited through the bottom bypass compared to the surface one. The behaviour of 74 individuals released in the forebay was observed by radiotelemetry. Close to half of the radiotagged eels returned up the headrace after their release, and most eventually migrated downstream over the dam with appropriate environmental conditions. Upon arrival at the power plant, eels displayed foraging behaviour in the forebay with frequent displacement interrupted by long resting periods in zones with low current. The repulsive effect of the trashrack located in front of the turbine intake increased with increasing turbined discharge. The study indicated that a trashrack with a smaller bar-spacing (around 20 mm), associated with an appropriate bypass, could deflect a large proportion of the female eels from the turbines. However, this solution needs to be tested on site to quantify the risk of mortality due to impingement on the trashrack |
author2 |
Ecologie Comportementale et Biologie des Populations de Poissons (ECOBIOP) Institut National de la Recherche Agronomique (INRA)-Université de Pau et des Pays de l'Adour (UPPA) EDF (EDF) Ecosystèmes estuariens et poissons migrateurs amphihalins (UR EPBX) Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) |
format |
Article in Journal/Newspaper |
author |
Gosset, Claude Travade, F. Durif, Caroline Elie, Pierre Rives, Jacques |
author_facet |
Gosset, Claude Travade, F. Durif, Caroline Elie, Pierre Rives, Jacques |
author_sort |
Gosset, Claude |
title |
Tests of two types of bypass for downstream migration of eels at a small hydroelectric power plant |
title_short |
Tests of two types of bypass for downstream migration of eels at a small hydroelectric power plant |
title_full |
Tests of two types of bypass for downstream migration of eels at a small hydroelectric power plant |
title_fullStr |
Tests of two types of bypass for downstream migration of eels at a small hydroelectric power plant |
title_full_unstemmed |
Tests of two types of bypass for downstream migration of eels at a small hydroelectric power plant |
title_sort |
tests of two types of bypass for downstream migration of eels at a small hydroelectric power plant |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.inrae.fr/hal-02586721 https://doi.org/10.1002/rra.871 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
ISSN: 1535-1459 EISSN: 1535-1467 River Research and Applications https://hal.inrae.fr/hal-02586721 River Research and Applications, Wiley, 2005, 21 (10), pp.1095-1105. ⟨10.1002/rra.871⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/rra.871 hal-02586721 https://hal.inrae.fr/hal-02586721 doi:10.1002/rra.871 IRSTEA: PUB00017797 |
op_doi |
https://doi.org/10.1002/rra.871 |
container_title |
River Research and Applications |
container_volume |
21 |
container_issue |
10 |
container_start_page |
1095 |
op_container_end_page |
1105 |
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1766401963635769344 |