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Site availability and density-dependent constraints on the acanthocephalan Pomphorhynchus laevis in rainbow trout, Oncorhynchus mykiss (Walbaum)

Published online by Cambridge University Press:  06 April 2009

R. M. Bates  and
C. R. Kennedy
R. M. Bates
Affiliation:
Department of Biological Sciences, Hatherly Laboratories, Exeter University, Prince of Wales Road, Exeter EX4 4PS
C. R. Kennedy
Affiliation:
Department of Biological Sciences, Hatherly Laboratories, Exeter University, Prince of Wales Road, Exeter EX4 4PS
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Extract

Threshold density levels were investigated experimentally in rainbow trout, Oncorhynchus mykiss, for the acanthocephalan Pomphorhynchus laevis. Fifty small fish 120–150 mm long were infected with 50 cystacanths each every 4 weeks for 16 weeks, and samples of up to 10 fish examined at 1, 5, 9, 13 and 17 weeks after the original infection. The mean intestinal length was found to have increased significantly over this period, from a mean of 125 to 173 mm and the mean number of parasites recovered increased after each interval of 4 weeks, and significantly from 19·30 to 86·40 per fish over the 17 weeks. The distribution of the parasites in the alimentary tract of O. mykiss was unaltered, indicating that the favourable region for establishment had remained unchanged. The failure to detect any manifestations of competition is discussed, and the relevance of conventional approaches to experimental investigations of both intra- and interspecific competition in fish was queried, and contrasted to the situation in birds and mammals.

Keywords

Pomphorhynchus laevisOncorhynchus mykisssite availabilitydensity dependenceAcanthocephalacompetition
Type
Research Article
Information
Parasitology , Volume 102 , Issue 3 , June 1991 , pp. 405 - 410
Copyright
Copyright © Cambridge University Press 1991

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