Parasites and their life-cycles-this function enhances its ability to complementĪctivities in the study of the pathology as well as, control of the major tropicalĭiseases of humans and their livestock. Parasitology is an area of study that describes the evolution of Many fish species have been found to harbor protozoanĪnd plenty of helminth parasites on their skin and/or under their scales ( George,Ģ002). Fish interacts with the various levels of foodĬhain and influence the structures of lakes, streams and estuaries since, theyĪre usually restricted to a particular mode of life related to their food sourceĪnd reproductive requirement. Several different levels of the aquatic food chain and makes up more than 40% Source of protein it contains lipids, minerals and vitamins. Of human in almost all continents of the world. Surface is covered by water, so fish has been an important part of the diets To both the animal and to the food prepared from it. Journal of Fisheries and Aquatic Science, 8: 115-121.įish is a food consumed by many species, including humans, the word fish refers Isolation, Identification and Prevalence of Parasites on Oreochromis niloticus from Three Selected River Systems. The study reveals that the prevalence of parasites infestation increases with increasing length, size and age of the fish host and different parts of the fish. were found to be prevalent, in varying magnitude, in most of the fish samples without clear age discrimination. The infestation was predominantly by Nematoda sp. Most of the parasites encountered were of the Protozoa, monogenea, Digenea, Cestoda and Nematoda groups. Samples were eviscerated and the parasites were excised, identified and species of parasites were counted. Twenty samples of a mixture of adult and juvenile individuals of Oreochromis niloticus were randomly obtained from fishermen landing at the jetties of Epe water side, Ikorodu (Odoguyan) river and brackish water (Makoko), between September and October, 2009 during a period of low rainfall. The prevalence of protozoan and helminthic parasite species occurring on and in the internal organs of Oreochromis niloticus was studied.
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