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Experimental study on the influence of paper and pulp mill effluent on the gill parasite communities of roach (Rutilus rutilus)

Published online by Cambridge University Press:  06 April 2009

A. M. Bagge  and
E. T. Valtonen
A. M. Bagge
Affiliation:
University of jyväskylä, Department of Bio- and Environmental Science, PO Box 35, 40351 Jyväskylä, Finland
E. T. Valtonen*
Affiliation:
University of jyväskylä, Department of Bio- and Environmental Science, PO Box 35, 40351 Jyväskylä, Finland
*
* Corresponding author.
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Summary

Roach (n = 81) caught on 23 May, 1992 from oligotrophic, unpolluted Lake Peurunka were kept in cages over a 2-week period before moving half of the fish to nearby Lake Vatia, which is influenced by pulp mill effluents. Before moving the fish gill parasites were examined from 9 fish; 5 Dactylogyrus species, Gyrodactylus sp. and Paradiplozoon homoion were found, the main components of the infracommunities being dactylogyrids. Afterwards, 5 fish from each lake were studied weekly between 1 July and 17 August. Metazoan parasites were recorded from gill arches divided into 4 sections along the dorso-ventral axis. D. crucifer, D. nanus, D. micracanthus and D. suecicus occurred in both lakes throughout the study. Gyrodactylus sp., Ergasilus briani and P. homoion occurred in low numbers in both lakes. Differences between the lakes were seen in the prevalence of D. micracanthus which was higher in Lake Vatia and significantly increased abundances of D. crucifer, D. nanus and D. micracanthus in Lake Vatia. Abundances of other Dactylogyrus species remained, on average, at the same level in both lakes. No change during the experiment was recorded in the location of the two most common species, D. crucifer and D. nanus, on the host gills in either of the lakes, both species favouring the 2nd and 3rd gill arches and especially the inner parts of the gills. The apparent lack of competition between the 2 most common Dactylogyrus species indicates that no limitation of resources on roach gills occurred. This was also confirmed by the increased overlapping indices with increasing abundances between the two most common species in Lake Vatia.

Keywords

roachDactryogyrus spp.Monogenapollutioncommunity structure.
Type
Research Article
Information
Parasitology , Volume 112 , Issue 5 , May 1996 , pp. 499 - 508
Copyright
Copyright © Cambridge University Press 1996

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