Loss of European silver eel passing a hydropower station

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The aim of this study was to assess escapement success of silver eels, Anguilla anguilla (L.), in a lowland river while passing a reservoir and a hydropower station. It was hypothesized that passage success would be lowest at the hydropower station and that survival and migration speed would be highest in the free-flowing river section upstream the reservoir. Forty-five female silver eels 56–86 cm in length were tagged with acoustic transmitters and released in November 2006. Their migration was monitored via automatic listening stations (ALS) in various sections of the river, covering a total migration distance of 64 km. Survival and progression rate of downstream migration was highest in the upstream river section and significantly lower in the reservoir. The eels apparently had trouble finding their way past the turbines and spent between 1.5 and 35 h in the forebay. The results show that within the study period, only 23% of the tagged eels reached the tidal limit, mainly due to difficulties in passing the hydropower dam. With such high loss-rates, the escapement goals set in the management plan cannot be achieved
Original languageEnglish
JournalJournal of Applied Ichthyology
Volume28
Issue number2
Pages (from-to)189-193
ISSN0175-8659
DOIs
Publication statusPublished - 2012

Cite this

@article{c69de4e3e01240db9d056e9fb5514306,
title = "Loss of European silver eel passing a hydropower station",
abstract = "The aim of this study was to assess escapement success of silver eels, Anguilla anguilla (L.), in a lowland river while passing a reservoir and a hydropower station. It was hypothesized that passage success would be lowest at the hydropower station and that survival and migration speed would be highest in the free-flowing river section upstream the reservoir. Forty-five female silver eels 56–86 cm in length were tagged with acoustic transmitters and released in November 2006. Their migration was monitored via automatic listening stations (ALS) in various sections of the river, covering a total migration distance of 64 km. Survival and progression rate of downstream migration was highest in the upstream river section and significantly lower in the reservoir. The eels apparently had trouble finding their way past the turbines and spent between 1.5 and 35 h in the forebay. The results show that within the study period, only 23{\%} of the tagged eels reached the tidal limit, mainly due to difficulties in passing the hydropower dam. With such high loss-rates, the escapement goals set in the management plan cannot be achieved",
author = "Pedersen, {Michael Ingemann} and Niels Jepsen and Kim Aarestrup and Anders Koed and Stig Pedersen and F. {\O}kland",
year = "2012",
doi = "10.1111/j.1439-0426.2011.01913.x",
language = "English",
volume = "28",
pages = "189--193",
journal = "Journal of Applied Ichthyology",
issn = "0175-8659",
publisher = "Wiley-Blackwell",
number = "2",

}

Loss of European silver eel passing a hydropower station. / Pedersen, Michael Ingemann; Jepsen, Niels; Aarestrup, Kim; Koed, Anders; Pedersen, Stig; Økland, F.

In: Journal of Applied Ichthyology, Vol. 28, No. 2, 2012, p. 189-193.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Loss of European silver eel passing a hydropower station

AU - Pedersen, Michael Ingemann

AU - Jepsen, Niels

AU - Aarestrup, Kim

AU - Koed, Anders

AU - Pedersen, Stig

AU - Økland, F.

PY - 2012

Y1 - 2012

N2 - The aim of this study was to assess escapement success of silver eels, Anguilla anguilla (L.), in a lowland river while passing a reservoir and a hydropower station. It was hypothesized that passage success would be lowest at the hydropower station and that survival and migration speed would be highest in the free-flowing river section upstream the reservoir. Forty-five female silver eels 56–86 cm in length were tagged with acoustic transmitters and released in November 2006. Their migration was monitored via automatic listening stations (ALS) in various sections of the river, covering a total migration distance of 64 km. Survival and progression rate of downstream migration was highest in the upstream river section and significantly lower in the reservoir. The eels apparently had trouble finding their way past the turbines and spent between 1.5 and 35 h in the forebay. The results show that within the study period, only 23% of the tagged eels reached the tidal limit, mainly due to difficulties in passing the hydropower dam. With such high loss-rates, the escapement goals set in the management plan cannot be achieved

AB - The aim of this study was to assess escapement success of silver eels, Anguilla anguilla (L.), in a lowland river while passing a reservoir and a hydropower station. It was hypothesized that passage success would be lowest at the hydropower station and that survival and migration speed would be highest in the free-flowing river section upstream the reservoir. Forty-five female silver eels 56–86 cm in length were tagged with acoustic transmitters and released in November 2006. Their migration was monitored via automatic listening stations (ALS) in various sections of the river, covering a total migration distance of 64 km. Survival and progression rate of downstream migration was highest in the upstream river section and significantly lower in the reservoir. The eels apparently had trouble finding their way past the turbines and spent between 1.5 and 35 h in the forebay. The results show that within the study period, only 23% of the tagged eels reached the tidal limit, mainly due to difficulties in passing the hydropower dam. With such high loss-rates, the escapement goals set in the management plan cannot be achieved

U2 - 10.1111/j.1439-0426.2011.01913.x

DO - 10.1111/j.1439-0426.2011.01913.x

M3 - Journal article

VL - 28

SP - 189

EP - 193

JO - Journal of Applied Ichthyology

JF - Journal of Applied Ichthyology

SN - 0175-8659

IS - 2

ER -