Parasites of White Crappie (Pomoxis annularis) in the Concho Valley of West-Central Texas



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During the fall and winter of 2019, trap net surveys were conducted on the South Concho River, Lake Nasworthy, O.C. Fisher Reservoir, and Twin Buttes Reservoir in San Angelo, Texas. The trap net surveys were conducted in conjunction with Texas Parks and Wildlife Department Inland Fisheries San Angelo, who were interested in estimating fish population size and structure in the 4 aquatic systems. The goal of the surveys reported here was to collect and report the parasites present in white crappie (Pomoxis annularis) in the Concho Valley. The fish (n=113) were frozen upon collection and necropsied in the summer of 2020. Additionally, the otoliths were removed and analyzed to compare age-specific rates of infection. Four parasite species were recovered: Cleidodiscus sp., Camallanus oxycephalus, Contracaecum sp., and Argulus longicaudus. The intensity and prevalence of each parasite species was reported and compared between aquatic systems. The prevalence of Cleidodiscus sp. was highest in the South Concho River, the prevalence and intensity of Camallanus oxycephalus was highest in Lake Nasworthy, and the prevalence and intensity of Contracaecum sp. was highest in O. C. Fisher Reservoir. No downstream accumulation of parasite prevalence or intensity was observed.



Parasite, Texas, fish, white crappie, Pomoxis annularis, Camallanus oxycephalus, Celidodiscus sp., contracaecum sp.