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Response of seaward-migrating European eel (Anguilla anguilla) to an infrasound deterrent

Response of seaward-migrating European eel (Anguilla anguilla) to an infrasound deterrent
Response of seaward-migrating European eel (Anguilla anguilla) to an infrasound deterrent
Behavioural guidance technologies that employ stimuli to attract or repel fish offer potential to enhance, or even replace, costly physical and mechanical screens traditionally used to protect fish at river infrastructure such as hydropower and water intakes. At these structures, eel can suffer high rates of damage and mortality if entrained in pumps or turbines, or impinged on screens intended to protect them. This study used acoustic telemetry to quantify the behavioural response of adult European eel (Anguilla anguilla) to infrasound (12 Hz) under field settings. Eel (n = 50) were tracked after release immediately upstream of the forebay of a redundant hydropower facility. An infrasound deterrent located at the water intake either emitted continuously (ON) or was switched OFF. Treatment (ON/OFF) was alternated nightly over 10 consecutive nights with five eel released during a single trial conducted each night. Seventy eight percent of the 41 eel that moved downstream into the forebay passed the intake. Although the infrasound deterrent had no effect on passage rate, fine-scale differences in movement patterns were determined. When the infrasound was ON, eel trajectories were on average over twice as long with frequent erratic turns and milling behaviour (i.e. repeated lateral movements perpendicular to the principal flow direction), and they were less active within the intake channel close to the device. Infrasound deterrents that induce avoidance could be used to protect eel, either through enhancing the efficiency of physical screens or as part of multimodel behavioural guidance systems. It is important to consider the influence of site characteristics, especially water velocities that dictate the potential for eel to respond to an acoustic field created.
0925-8574
Piper, Adam T
2c816a29-68a2-4267-8283-fef27c2e75f3
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Wright, Rosalind M.
d2608e88-f522-44ed-b58e-bad60c522f23
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Kemp, Paul
9e33fba6-cccf-4eb5-965b-b70e72b11cd7
Piper, Adam T
2c816a29-68a2-4267-8283-fef27c2e75f3
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Wright, Rosalind M.
d2608e88-f522-44ed-b58e-bad60c522f23
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Kemp, Paul
9e33fba6-cccf-4eb5-965b-b70e72b11cd7

Piper, Adam T, White, Paul, Wright, Rosalind M., Leighton, Timothy and Kemp, Paul (2018) Response of seaward-migrating European eel (Anguilla anguilla) to an infrasound deterrent. Ecological Engineering. (doi:10.1016/j.ecoleng.2018.12.001).

Record type: Article

Abstract

Behavioural guidance technologies that employ stimuli to attract or repel fish offer potential to enhance, or even replace, costly physical and mechanical screens traditionally used to protect fish at river infrastructure such as hydropower and water intakes. At these structures, eel can suffer high rates of damage and mortality if entrained in pumps or turbines, or impinged on screens intended to protect them. This study used acoustic telemetry to quantify the behavioural response of adult European eel (Anguilla anguilla) to infrasound (12 Hz) under field settings. Eel (n = 50) were tracked after release immediately upstream of the forebay of a redundant hydropower facility. An infrasound deterrent located at the water intake either emitted continuously (ON) or was switched OFF. Treatment (ON/OFF) was alternated nightly over 10 consecutive nights with five eel released during a single trial conducted each night. Seventy eight percent of the 41 eel that moved downstream into the forebay passed the intake. Although the infrasound deterrent had no effect on passage rate, fine-scale differences in movement patterns were determined. When the infrasound was ON, eel trajectories were on average over twice as long with frequent erratic turns and milling behaviour (i.e. repeated lateral movements perpendicular to the principal flow direction), and they were less active within the intake channel close to the device. Infrasound deterrents that induce avoidance could be used to protect eel, either through enhancing the efficiency of physical screens or as part of multimodel behavioural guidance systems. It is important to consider the influence of site characteristics, especially water velocities that dictate the potential for eel to respond to an acoustic field created.

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infrasound_ms_final_accepted_for_Soton - Accepted Manuscript
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Accepted/In Press date: 27 November 2018
e-pub ahead of print date: 28 December 2018

Identifiers

Local EPrints ID: 427079
URI: http://eprints.soton.ac.uk/id/eprint/427079
ISSN: 0925-8574
PURE UUID: 01390e55-c0c2-4fb9-8762-38753b5e9b78
ORCID for Paul White: ORCID iD orcid.org/0000-0002-4787-8713
ORCID for Timothy Leighton: ORCID iD orcid.org/0000-0002-1649-8750
ORCID for Paul Kemp: ORCID iD orcid.org/0000-0003-4470-0589

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Date deposited: 21 Dec 2018 16:30
Last modified: 07 Oct 2020 06:30

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