SREL Reprint #0385

 

 

 

Effects of Thermal Effluent on the Population Dynamics of Helminth Parasites in Largemouth Bass

Herman E. Eure and Gerald W. Esch

 

Abstract

Samples of largemouth bass (Micropterus salmoides) were taken from June 1972 through March 1973 at six locations in Par Pond on the Savannah River Plant site near Aiken, SC.  The pond has temperature regimes ranging from normal to >10C above normal.  Helminth parasites in largemouth bass exhibited a definite seasonal change in intensity of infection but not in incidence of infection.  The pattern was most apparent for the acanthocephalan Neochinorbynchus cylindratus.  This same pattern held for the tapeworm, nermatode, and trematode population, although the levels of infection were lower than those of the acanthocephalan populations.  Fish from all areas had relatively reduced parasite loads from June through October.  Maximum worm burdens were reached in December and were maintained through March.  The number of parasites per host was significantly higher in fish taken from areas with elevated water temperature compared to those from normal areas.  Female hosts had higher worm burdens than males.  Sex ratios for N. cylindratus were not significantly different in fish taken from areas of Par Pond having different temperature regimes.

 

SREL Reprint #0385

Eure, H.E. and G.W. Esch. 1974. Effects of thermal effluent on the population dynamics of helminth parasites in largemouth bass. p. 207-215. In Thermal Ecology, edited by J.W. Gibbons and R.R. Sharitz. CONF 730505. Atomic Energy Commission.

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