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Impacts of anthropogenic sound on fish behaviour

Impacts of anthropogenic sound on fish behaviour
Impacts of anthropogenic sound on fish behaviour
Species like the European eel (Anguilla anguilla) and the river lamprey (Lampetra fluviatilis), as a consequence of their migratory life cycle, are more likely to experience several of anthropogenic pressures (e.g. infrastructures, pollution, barriers to migration). Both species populations have been severely declining for several decades, leading international organizations to institute some strict protective regulations. To meet the expectations of these regulations, there is a current need to investigate further the anthropogenic impacts responsible for this decline and to develop new methods to ensure the protection of these species.

In addition, there is scientific concern about the rising underwater sound levels due to human activity and its consequences on marine and freshwater life. This thesis investigated the effects of basic anthropogenic sounds on the behaviours of European eel and river lamprey. Furthermore, this research also looked into re-using the previous findings to improve current knowledge in behavioural mitigation techniques for fish passage at infrastructures.

Hearing capabilities of both species and their responses to acoustics were assessed using two approaches: (1) a confined experiment using specific test frequencies and allowing the establishment of a detailed panel of behaviour, (2) a novel approach involving an acoustic maze set in a large flume, to observe sounds impacts on fish movements. Finally, a third experiment involving a traditional mitigation system (bar-screen), tested the efficiency of this system in combination to two acoustic stimuli.

In terms of hearing capabilities, both species appeared to be more sensitive to low-frequency sounds. Fish swimming trajectories were poorly affected by sound. Nevertheless, the time taken by fish to pass the acoustic area was modified by the presence of the acoustic stimuli compared to control conditions. A rejection behaviour was observed with several fish in presence of sound. Furthermore, our results indicate that the response is very dependent of the test subject.

This research brought new material and methodology for the study of behavioural response of fish to sound. Nevertheless, more work is needed to develop a more effective acoustic signal to achieve better guidance of anguilliform species at infrastructure passage and also to determine long term effect of sound on fish.
University of Southampton
Deleau, Mathias
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Deleau, Mathias
0c5300a5-cb7c-44bc-8630-ad00d4e8bf41
Kemp, Paul
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White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae

Deleau, Mathias (2018) Impacts of anthropogenic sound on fish behaviour. Faculty of Engineering and the Environment, Doctoral Thesis, 194pp.

Record type: Thesis (Doctoral)

Abstract

Species like the European eel (Anguilla anguilla) and the river lamprey (Lampetra fluviatilis), as a consequence of their migratory life cycle, are more likely to experience several of anthropogenic pressures (e.g. infrastructures, pollution, barriers to migration). Both species populations have been severely declining for several decades, leading international organizations to institute some strict protective regulations. To meet the expectations of these regulations, there is a current need to investigate further the anthropogenic impacts responsible for this decline and to develop new methods to ensure the protection of these species.

In addition, there is scientific concern about the rising underwater sound levels due to human activity and its consequences on marine and freshwater life. This thesis investigated the effects of basic anthropogenic sounds on the behaviours of European eel and river lamprey. Furthermore, this research also looked into re-using the previous findings to improve current knowledge in behavioural mitigation techniques for fish passage at infrastructures.

Hearing capabilities of both species and their responses to acoustics were assessed using two approaches: (1) a confined experiment using specific test frequencies and allowing the establishment of a detailed panel of behaviour, (2) a novel approach involving an acoustic maze set in a large flume, to observe sounds impacts on fish movements. Finally, a third experiment involving a traditional mitigation system (bar-screen), tested the efficiency of this system in combination to two acoustic stimuli.

In terms of hearing capabilities, both species appeared to be more sensitive to low-frequency sounds. Fish swimming trajectories were poorly affected by sound. Nevertheless, the time taken by fish to pass the acoustic area was modified by the presence of the acoustic stimuli compared to control conditions. A rejection behaviour was observed with several fish in presence of sound. Furthermore, our results indicate that the response is very dependent of the test subject.

This research brought new material and methodology for the study of behavioural response of fish to sound. Nevertheless, more work is needed to develop a more effective acoustic signal to achieve better guidance of anguilliform species at infrastructure passage and also to determine long term effect of sound on fish.

Text
Final Thesis Mathias DELEAU - Version of Record
Available under License University of Southampton Thesis Licence.
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More information

Published date: December 2018

Identifiers

Local EPrints ID: 435710
URI: http://eprints.soton.ac.uk/id/eprint/435710
PURE UUID: 18dcc81b-74be-4439-a99e-c2843f53b510
ORCID for Paul Kemp: ORCID iD orcid.org/0000-0003-4470-0589
ORCID for Paul White: ORCID iD orcid.org/0000-0002-4787-8713
ORCID for Timothy Leighton: ORCID iD orcid.org/0000-0002-1649-8750

Catalogue record

Date deposited: 18 Nov 2019 17:32
Last modified: 19 Nov 2019 02:02

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