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The behavioural response of river lamprey (Lampetra fluviatilis) to two types of experiment weir.

Kemp, P.S., Tsuzaki, T., Russon, I.J, Moser, M., Muller, G.U. and Lucas, M. (2007) The behavioural response of river lamprey (Lampetra fluviatilis) to two types of experiment weir. At Sixth International Ecohydraulics Symposium. 18 - 23 Feb 2007.

Record type: Conference or Workshop Item (Paper)


Several populations of river lamprey have declined across Europe over recent years and have been extirpated in some rivers. As a result, this species is protected under Annex II of the European Habitats and Species Directive. An inability of this relatively weak swimming anadromous fish to negotiate in-river impediments, such as weirs, during their spawning migration has been cited as an explanation for their decline. The ability of 100 upstream migrating lamprey to negotiate either an undershot or overshot weir was assessed using an experimental flume at night. Under infrared illumination, ten trials were conducted over 3 flows in which the approach and passage over or under the weir was recorded using overhead video cameras. Distinctly different fine-scale hydraulic conditions associated with the two weir configurations were mapped by hydraulic engineers. In an attempt to bridge the gap between fluid dynamics and fish behaviour, the response of the lamprey to the hydraulic conditions encountered was investigated. Passage efficiency was negatively related to discharge and velocity and more likely when an undershot weir was used, although fish were observed to pass over the crest of the weir against velocity of 1.5 m s-1. The lamprey were observed to follow routes of “least resistance” and to alter their behaviour in relation to weir type. The findings have important implications for the design of fish passage facilities for this species.

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Published date: February 2007
Venue - Dates: Sixth International Ecohydraulics Symposium, 2007-02-18 - 2007-02-23


Local EPrints ID: 53138
PURE UUID: 8f825920-cadd-4f9c-823c-960087e4d176
ORCID for P.S. Kemp: ORCID iD

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Date deposited: 25 Jul 2008
Last modified: 17 Jul 2017 14:38

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Author: P.S. Kemp ORCID iD
Author: T. Tsuzaki
Author: I.J Russon
Author: M. Moser
Author: G.U. Muller
Author: M. Lucas

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