A Survey of Ecto-Parasites in Oreochromis niloticus (Linnaeus, 1758) (Nile Tilapia) in Zobe Reservoir, Katsina State

Abstract

This study examined the occurrence and severity of ectoparasitic infestations in Oreochromis niloticus (Nile Tilapia) sourced from Zobe Artificial Lake in Dutsin-Ma, Katsina State. A total of 108 Nile tilapia specimens were collected from Zobe Reservoir in Dutsin-Ma, Katsina, Nigeria at bi-weekly intervals during the period from July- September; 2023 for the discovery of ectoparasites and subjected to thorough parasitological examination. Experimental samples was range between 10.0-15.0cm fry, 16.1-20.0cm fingerlings, 21.0-25.0cm adults. Among the examined male Nile tilapia, 40 (45.45%) were found to be infected with ecto-parasites, while a higher infection rate of 75.00% was observed among the females. Overall infection of 55 (50.92%) was recorded in this study. Among the examined individuals, 21 (46.67%) were infected with Trichodina spp on the skin. Trichodina spp also infected 8 individuals (17.78%) in the gills. No individuals were infected with Gyrodactylus spp on the skin. Gyrodactylus spp infected 16 individuals (35.55%) in the gills. An overall infection rate, the total infection rate on the skin is 46.67%. While the total infection rate in the gills is 53.33%. The outcomes of this survey serve up as a reference point for upcoming research, offering valuable information for fisheries management and the sustainable conservation of aquatic ecosystems in Zobe Reservoir. High prevalence of ectoparasites was recorded in this study. There is need for proper handling of Nile tilapia from Zobe Reservoir before consumption.