Skip to main content


Title: Impact of the signal crayfish Pacifastacus leniusculus and its associated crayfishery on the River Thame
Author: A.T. Ibbotson
Author: G. Tapia
Author: M.T. Furse
Author: J.M. Winder
Author: J. Blackburn
Author: P. Scarlett
Author: J. Smith
Document Type: Monograph
Three reaches of the River Thame were selected to determine the impacts of the signal crayfish Pacifastacus iertiuscuius and its associated crayfishery on the fauna and flora of the river. In the first reach the crayfish population was exploited by a commercial fishery; another reach contained an unexploited crayfish population; and the third reach had no crayfish at the beginning of the study. In each month for a complete year each reach was sampled with the use o f baited traps. All crayfish captured were measured, sexed and either tagged with individually numbered tags or given date coded uropodal or pleopodal clips before being returned alive to the river. To reduce the possibility that any observed differences in the three study reaches were due to differences in physical habitat, they were compared using multi-variate techniques. This demonstrated that the range of variation between the reaches was small and there was considerable overlap between the site value ranges of individual variables.
Publisher: Environment Agency
Publication Date: 2001
Publication Place: Reading
Subject Keywords: RiversCrustaceaInvasive speciesBiological surveysEnvironmental impactRiver fisheriesEnvironmental management
Geographic Keywords: Thame and South Chilterns catchmentThame (South England)Buckinghamshire
Extent: 87; + appendices
Total file downloads: 36

Download PDF    Display PDF in separate tab