SREL Reprint #0506




Seasonal Abundance of Neoechinorhynchus cylindratus taken from Largemouth Bass (Micropterus salmoides) in a Heated Reservoir

H. Eure



Samples of largemouth bass were collected from Par Pond located on the Energy Research and Development Administration’s Savannah River Plant in Aiken, South Carolina, from June 1972 to May 1973 inclusive.  The sampling stations reflected water temperatures which were both normal and greater than 10ºC above normal for the area.  The acanthocephalan Neoechinorhynchus cylindratus was the dominant species found in the bass sampled.  Incidences of infection for this parasite were generally greater than 95% regardless of location.  A pronounced seasonal cycling pattern in the intensity of infection was noted in both thermal regions.  Significant differences, however, in the mean density of N. cylindratus per host in fish taken from the heated area as compared with unheated areas were noted.

Turnover in the acanthocephalan population was measured by following the percentage of individuals less than 2 mm long.  Fall proved to be the most intense parasite recruitment season, followed by maturation of the parasite and subsequent loss from the fish host.

The principal factors responsible for the seasonal incidence and intensity patterns are considered to be changes in the fish feeding behavior and annual temperature regimes.


SREL Reprint #0506

Eure, H. 1976. Seasonal abundance of Neoechinorhynchus cylindratus taken from largemouth bass (Micropterus salmoides) in a heated reservoir. Parasitology 73:355-370.

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