Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

Can pikeperch colonise new freshwater systems via estuaries? Evidence from behavioural salinity tests

Dawn M. Scott A C , Johanna Rabineau A , Rod W. Wilson A , Dave J. Hodgson B and J. Anne Brown A

A University of Exeter, School of Biosciences, Hatherly Laboratories, Exeter, EX4 4PS, UK.

B University of Exeter, School of Biosciences, Cornwall Campus, Penryn, TR10 9EZ, UK.

C Corresponding author. Email: d.m.scott@exeter.ac.uk

Marine and Freshwater Research 59(8) 694-702 http://dx.doi.org/10.1071/MF07241
Submitted: 13 December 2007  Accepted: 2 June 2008   Published: 22 August 2008

Abstract

Pikeperch (Sander lucioperca) are non-native in the United Kingdom. It is important to understand how environmental factors, such as salinity, influence the behaviour and activity of introduced fish species to identify their dispersal potential. Previous studies have shown that pikeperch, traditionally recognised as a freshwater fish, can tolerate brackish waters and demonstrate physiological acclimation. However, their behavioural responses to brackish waters are unknown. The aim of the present study was therefore to investigate the activity and swimming behaviour of pikeperch obtained from freshwater canals in southern England. In the laboratory, fish were exposed to a 12-h simulated tidal cycle and a 12-day stepped salinity challenge where salinity was increased by 4 every 2 days, up to a salinity of 20. In both regimes, fish showed increased swimming activity in response to increasing salinity, which may represent an avoidance response. The most dramatic changes, including vertical movements, occurred at salinities above ~16. At these higher salinities, head shaking and coughing behaviours were also observed, suggesting significant stress and respiratory impairment. However, during the simulated tidal cycle, normal behaviour was rapidly restored once salinity was reduced. The results of this study may have implications in understanding the dispersal of non-native fish in the wild.

Additional keywords: invasive fish, non-indigenous fish, swimming behaviour, zander.


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