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Establishment, survival, site selection and development of Leptorhynchoides thecatus in largemouth bass, Micropterus salmoides

Published online by Cambridge University Press:  06 April 2009

C. C. Leadabrand  and
B. B. Nickol
C. C. Leadabrand
Affiliation:
School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0118, USA
B. B. Nickol
Affiliation:
School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0118, USA
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Summary

Establishment, survival and distribution of Leptorhynchoides thecatus (Acanthocephala) were investigated in largemouth bass, Micropterus salmoides, fed 10, 25, or 40 cystacanths and examined at 1, 3 or 5 weeks post-infection. Worms established widely in the alimentary tracts of bass but by 5 weeks post-infection had localized in the pyloric caeca and intercaecal region. Other individuals moved to parenteral sites where they remained immature, though viable. In the 10- and 25-level exposures, establishment and survivorship in the alimentary tract were roughly proportional to the dose of cystacanths. After 1 week post-infection in the 40-level exposure class, numbers of worms in the alimentary tract decreased significantly and parenteral occurrence increased significantly. Total survival of L. thecatus appeared to be density-independent. Maturation of worms was retarded temporarily as intensity of infection increased, but by 5 weeks post-infection worms from all doses were at roughly the same stage of development within sex. The caeca and intercaecal area apparently did not differ in their suitability for maturation.

Keywords

Leptorhynchoides thecatussite selectionestablishmentsurvivorshipdevelopmentMicropterus salmoides
Type
Research Article
Information
Parasitology , Volume 106 , Issue 5 , June 1993 , pp. 495 - 501
Copyright
Copyright © Cambridge University Press 1993

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