|SREL Reprint #0567|
on the Ecology of Clinostomum marginatum in Largemouth Bass
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.