SREL Reprint #0567




Observations on the Ecology of Clinostomum marginatum in Largemouth Bass (Micropterus salmoides)

Terry C. Hazen and Gerald W. Esch



Over a fifteen month period, beginning October, 1974, approximately 13 500 centrarchids were examined for evidence of infection with metacercaria of Clinostomum marginatum.  Species checked included Lepomis macrochirus, L. gulosus, L. auritus, Pomixis nigromaculatus and Micropterus salmoides.  The study site was Par Pond (South Carolina, U.S.A.) an 1120 ha reservoir receiving thermal effluent from a nuclear production reactor.  Except for the largemouth bass, M. salmoides, infection percentages among the five species were less than 1%.  Among bass, infection varied seasonally, being highest from January to June.  From the spring highs of approximately 25% the percentages dropped to lows of <10% in July and August; there was a jump in September-October to another peak of 30% and then a steady decline through December when infection percentages were again less than 10%.  Neither body condition nor length of the bass were related to the influence of thermal effluent.  Infection percentages did vary from location within the Par Pond system.  A significant rank correlation could be established between infection percentage and the amount of literal zone present in the locality from which the bass were taken.  It is suggested that the local ‘bay effects’ are the result of limited home and foraging ranges of the bass in relation to the amounts of literal zone present in various locations of the reservoir.


SREL Reprint #0567

Hazen, T.C. and G.W. Esch. 1978. Observations on the ecology of Clinostomum marginatum in largemouth bass (Micropterus salmoides). Journal of Fish Biology 12:411-420.

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