Abstract
The study was carried out in Erinle Reservoir accessed through Oore (Latitude 7° 58' 12" North; Longitude 4º 33' 36" East), in Osun State, Nigeria, between August 2011 and November 2013. A total of 103 live fishes purchased from local fishermen were examined. In the laboratory, morphometric parameters were measured, the sexes determined and the fish species Clarias gariepinus were dissected to separate the alimentary system. Parasites recovered were identified and counted and the data were subjected to statistical analyses. The parasites recovered were Procamallanus laevionchus, Paracamallanus cyathopharynx (Nematodes.), Anomotaenia sp., Monobothrium sp., Polyonchobothrium clariae. (Cestodes) and Neoechinorynchus rutili (Acanthocephalan). Using a non parametric (NPar) (Kolmogorov-Smirnov; K-S) test, infection was significant at p = 0.05 within seasons, and female fishes were more infected than male. Monobothrium sp. had the highest range of infection (0 to 44) and intensity (18.5±2.65) while Anomotaenia sp. had the least (0 to 1) and (1.00±0.02) respectively. Six parasites were found in the intestine, while four were in the stomach. There was high prevalence in medium and large sized fish and a direct linear relationship exist between length and intensity. The body weight was significant in relation to infection at p = 0.05 (K-S test) and was also significant in sex. Multiple infections were common, which showed a positive correlation between most of the parasites except Anomotaenia sp. which showed negative correlation with P. clariae. Key words: Clarias gariepinus, morphometric, parasite, prevalence.
Highlights
In many parts of the world, studies of fish parasites and diseases are very advanced, resulting in the accumulation of an enormous amount of literature and information
Numerous parasites were associated with Tilapia zilli, Clarias anguillaris and Clarias gariepinus during the study of the biology of the fish species in their natural environments (Eyo and Olatunde, 2001; Ovie and Ovie, 2002; Olofintoye, 2006)
Prevalence and intensities of parasites in the gut of Prevalence of Helminthes was higher in the intestine than the stomach, similar to the findings by Mohammed et al
Summary
In many parts of the world, studies of fish parasites and diseases are very advanced, resulting in the accumulation of an enormous amount of literature and information. Studies in Africa vary considerably from area to area and the parasites are mostly mentioned, as part of the fulfillment of the biology of the host fish species. Khalil and Polling (1997) produced a check list of the Helminthes parasites of African freshwater fishes. Numerous parasites were associated with Tilapia zilli, Clarias anguillaris and Clarias gariepinus during the study of the biology of the fish species in their natural environments (Eyo and Olatunde, 2001; Ovie and Ovie, 2002; Olofintoye, 2006). The emanating need to culture fishes for protein consumption for the teeming rapidly growing populations in the developing countries like Nigeria have made it necessary to intensify studies on the parasite fauna of the African freshwater fishes (Akinsanya et al, 2007)
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