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Use of acoustics to enhance the efficiency of physical screens designed to protect downstream moving European eel (Anguilla anguilla)

Use of acoustics to enhance the efficiency of physical screens designed to protect downstream moving European eel (Anguilla anguilla)
Use of acoustics to enhance the efficiency of physical screens designed to protect downstream moving European eel (Anguilla anguilla)
European eel (Anguilla anguilla) are vulnerable to entrainment at a variety of man-made intakes, including those that lead to hydropower turbines or other abstraction points. Two experiments were conducted to investigate the potential for acoustic stimuli to improve the efficiency of a vertical bar-screen to guide downstream moving eel. Three underwater speakers were installed along the channel wall of an external flume, upstream of the screen. In first experiment (1), screen guidance efficiency recorded in the presence (treatment) and absence (control) of a continuous broadband stimulus was individually compared between fish from to respective groups. Adopting a “before-after” design, the second experiment (2) assessed individually the guidance of control eel from the group previously used in experiment 1 when exposed to a 100 Hz pulse. The majority of eel reached the bypass in both experiments with only three passing through the screen during the controls against one during each acoustic treatment. Rejection of the area adjacent to the speakers was more common during the acoustic treatment with eel moving past the speakers more rapidly in the presence of sound. The results suggest that employing acoustic stimuli enhances the guidance efficiency of physical screens.
Eel, Downstream passage, Screen, Acoustics, Mitigation, Anguilla
0969-997X
Deleau, Mathias J. C.
0c5300a5-cb7c-44bc-8630-ad00d4e8bf41
White, Paul R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Peirson, Graeme
d51969a8-c948-448a-9aa6-8a466c69aedd
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Kemp, Paul S.
9e33fba6-cccf-4eb5-965b-b70e72b11cd7
Deleau, Mathias J. C.
0c5300a5-cb7c-44bc-8630-ad00d4e8bf41
White, Paul R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Peirson, Graeme
d51969a8-c948-448a-9aa6-8a466c69aedd
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Kemp, Paul S.
9e33fba6-cccf-4eb5-965b-b70e72b11cd7

Deleau, Mathias J. C., White, Paul R., Peirson, Graeme, Leighton, Timothy G. and Kemp, Paul S. (2019) Use of acoustics to enhance the efficiency of physical screens designed to protect downstream moving European eel (Anguilla anguilla). Fisheries Management and Ecology. (doi:10.1111/fme.12362).

Record type: Article

Abstract

European eel (Anguilla anguilla) are vulnerable to entrainment at a variety of man-made intakes, including those that lead to hydropower turbines or other abstraction points. Two experiments were conducted to investigate the potential for acoustic stimuli to improve the efficiency of a vertical bar-screen to guide downstream moving eel. Three underwater speakers were installed along the channel wall of an external flume, upstream of the screen. In first experiment (1), screen guidance efficiency recorded in the presence (treatment) and absence (control) of a continuous broadband stimulus was individually compared between fish from to respective groups. Adopting a “before-after” design, the second experiment (2) assessed individually the guidance of control eel from the group previously used in experiment 1 when exposed to a 100 Hz pulse. The majority of eel reached the bypass in both experiments with only three passing through the screen during the controls against one during each acoustic treatment. Rejection of the area adjacent to the speakers was more common during the acoustic treatment with eel moving past the speakers more rapidly in the presence of sound. The results suggest that employing acoustic stimuli enhances the guidance efficiency of physical screens.

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More information

Accepted/In Press date: 19 May 2019
e-pub ahead of print date: 10 July 2019
Keywords: Eel, Downstream passage, Screen, Acoustics, Mitigation, Anguilla

Identifiers

Local EPrints ID: 432504
URI: https://eprints.soton.ac.uk/id/eprint/432504
ISSN: 0969-997X
PURE UUID: d50d2436-b80f-496d-a316-4f022af0480d
ORCID for Paul R. White: ORCID iD orcid.org/0000-0002-4787-8713
ORCID for Timothy G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750
ORCID for Paul S. Kemp: ORCID iD orcid.org/0000-0003-4470-0589

Catalogue record

Date deposited: 17 Jul 2019 16:30
Last modified: 17 Sep 2019 01:09

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