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Advancing provision of multi-species fish passage: behaviour of adult European eel (Anguilla anguilla) and brown trout (Salmo trutta) in response to accelerating flow

Russon, Iain J. and Kemp, Paul S. (2011) Advancing provision of multi-species fish passage: behaviour of adult European eel (Anguilla anguilla) and brown trout (Salmo trutta) in response to accelerating flow Ecological Engineering, 37, (12), pp. 2018-2024. (doi:10.1016/j.ecoleng.2011.08.005).

Record type: Article

Abstract

The behavioural response of downstream moving European eel (Anguilla anguilla) and brown trout (Salmo trutta) to velocity gradients created by orifice weirs placed in a flume were studied. The aim was to identify interspecific variation and test two hypotheses: (1) a more abrupt velocity gradient would induce a higher avoidance response and over a greater distance, and (2) fish would acclimate to the velocity gradient by incrementally sampling conditions closer to the orifice until successful passage occurred. European eel moved along the channel floor and walls, responding after physical contact with the weir. Brown trout moved downstream head first and switched orientation at the velocity gradient without contacting the structure. Brown trout spent longer than European eel immediately upstream of a channel floor orifice, although time to pass was similar; but less time at a mid-column orifice despite taking longer to pass. The mid-column orifice delayed both species longer. European eel passed orifices head first on initial encounter with no rejections, whereas brown trout passed tail first. Positions where brown trout first switched orientation and closest point to the orifice reached during initial approach occurred closer to a channel floor than mid-column treatment. Brown trout did not appear to acclimate to the velocity gradient by sampling successively closer to the orifice. Interspecific variation in behaviour remains a key challenge in developing multi-species fish passes

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More information

e-pub ahead of print date: 16 September 2011
Published date: December 2011
Organisations: Centre for Environmental Science

Identifiers

Local EPrints ID: 300628
URI: http://eprints.soton.ac.uk/id/eprint/300628
ISSN: 0925-8574
PURE UUID: 69e65c82-4bfd-4ef1-824c-ecf6679a9fec
ORCID for Paul S. Kemp: ORCID iD orcid.org/0000-0003-4470-0589

Catalogue record

Date deposited: 24 Feb 2012 14:14
Last modified: 18 Jul 2017 06:14

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Contributors

Author: Iain J. Russon
Author: Paul S. Kemp ORCID iD

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