Theses and Dissertations

Title: The seasonal occurrence of monogenetic trematodes on Lepomis macrochirus and Micropterus salmoides in Walter F. George Reservoir

Name: Rawson, Jr Mac V.

Degree: MS

Chair: Dr. Wilmer A. Rogers

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1969

Pages: 60

Keywords: Seasonal Occurrence,Monogenetic Trematodes,Lepomis macrochirus,Micropterus salmoides,Walter F. George Reservoir,Alabama.


Samples of bluegill and largemouth bass were collected from Walter F. George Reservoir at two-week intervals from December 14, 1967 to January 6, 1969. The Monogenea were collected from the body surface and gills. Ten species of Monogenea occurred on the bluegill and five on the bass. There were seasonal changes in the frequencies of all species of Monogenea on both the bluegill and the largemouth bass. On the bluegill, the frequency of Anchoradiscus triangularis was negatively correleated with water temperature. No other Monogenea on the bluegill was correlated to the length of the host or the water temperature. However, graphically there was an indication of a negative correlation between the frequencies of Clavunculus bursatus and increases in water temperature. The frequencies of Urocleidus dispar, U. ferox, U. acer and Actinocleidus fergusoni generally increased over the study period with the largest increases occurring in the summer and late fall months. Cleidodiscus robustus occurred consistently in the spring months but did not occur in the samples in other periods. Cleidodiscus nematocirrus remained an insignificant part of the samples but occurred consistently in the samples. Lyrodiscus seminolensis was most frequent in April. It occurred consistently until August but was found infrequently during the remainder of the study. The population of Gyrodactylus macrochiri exhibited peaks in June and late September. The average length of the largemouth bass was positively correlated with the water temperature. The population frequencies of U. furcatus and U. principalis were positively correlated with water temperature and length of the bass. The number of Urocleidus specimens increased during late March and April. However, the frequency of A. fusiformis and Clav. bursatus decreased during the same period, late March and April. Population densities of the four species reached high levels in the summer months followed by a decline in the fall and a sudden increase in December 1968. The population density of G. macrochiri reached a high peak in February and two lesser peaks during March and April and again in December 1968. There were correlations between the frequencies of several of the species. The interspecific correlations were divided into three major groupings: (1) Urocleidus, (2) Actinocleidus and (3) non-correlating species. A. fergusoni on the bluegill, U. furcatus and U. principalis on the largemouth bass exhibited correlations so closely related to the total number of the gills as to provide a tool for estimation of gill worm totals.

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