Parasites as Bioindicator for Health Status and Environmental quality of Freshwater Fish species in Ekiti State, Nigeria
DOI:
https://doi.org/10.14738/jbemi.62.5847Keywords:
Bioindicators, Dam, Fish, Parasites, Prevalence Freshwater,Abstract
The prevalence of parasites occurring on and in the internal organs of fish species was studied. Fish species (Oreochromis niloticus, Clarias gariepinus, Tilapia zilli) were randomly obtained from fishermen landing at the jetties of Ado, Ero, Ogbese, Ikun and Egbe dams, in Ekiti state. Samples were dissected; smears for the identification of ectoparasites were taken directly from the gills, operculum and skin. The parasites were excised, identified and counted. Nematode parasite with the total sum of 164(29.6%) was the most abundant parasite occurring in all the dams. This was followed by Trichodina sp (Ciliophora) with total abundance value of 147(26.5%) in all the dams. Acanthocephalan, Gyrodactylus sp, Dactylogyrus sp, Diphyllobothrium latum and Clinostomum sp have abundance values of 26 (4.7%), 27(4.9%), 21(3.8%), 146 (26.4%) and 23(4.2%) respectively with Dactylogyrus sp (Monogenea) being least abundant, 21(3.8%), in all the dams. The overall parasitic prevalence from the different dams showed that Ado dam had the highest parasitic infection with 27.3% which suggests that Ado dam has the lowest water quality. There is need for constant surveillance in rivers and reservoirs to detect early signs of parasitic infection. Viable preventive measures against fish parasitism in Nigerian freshwater bodies are highly recommended.
References
(1) Milen Nachev and Bernd Sures Environmental parasitology: parasites as accumulation bioindicators in the marine environment. Journal of Sea Research 2016. 113: 45-50.
(2) Bernet, D.H. Schmidt, W. Meier, P. Burkhardt-Holm and T. Wahl. Histopathology in fish proposal for a protocol to assess aquatic pollution. Journal of Fish diseases 1999. 22: 25-34
(3) Authman, M.M.N., E.M. Bayoumy and A.M. Kenawy. Heavy metal concentrations and liver histopathology of Oreochromis niloticus in relation to aquatic pollution. Global Veterinaria, 2008 2: 110-116.
(4) Khan, R.A. and S.M. Billiard,.Parasites of winter flounder (Pleuronectes americanus) as an additional bioindicator of stress-related exposure to untreated pulp and paper mill effluent: A 5-year field study. Archives of Environmental Contamination Toxicology 2007 52: 243-25
(5) Oros, M. and V. Hanzelova,. Re-establishment of the fish parasite fauna in the Tisa River system (Slovakia) after a catastrophic pollution event. Parasitology Research., 2009 104: 1497-1506
(6) Pietrock, M., T. Meinelt and D.J. Marcogliese,. Effects of cadmium exposure on embryogenesis of Stagnicola elodes (Mollusca, Gastropoda): Potential consequences for parasite transmission. Archives of Environmental Contamination Toxicology 2008 55: 43-48.
(7) Lafferty, K. D; Ecosystem Consequences of Fish Parasites, Journal of Fish biology, 2008 73, 2083-2093.
(8) Overstreet, R.M. Parasitological Data as Monitors of Environmental Health. Parasitologia, 1997. 39;169-175
(9) Paperna, I. Parasites, Infections and Diseases of Fishes in Africa. FAO, Rome, Italy, 1980: 216
(10) Sures, B. The Use of Fish Parasites as Bioindicator of Heavy Metals in Aquatic Ecosystems: A review. Aquatic. Ecology. 2001 35:245-255
(11) Paperna, I. Parasites, Infections and Diseases of Fishes in Africa, an update. CIFA Tech paper, 1996. 31; 1-200
(12) Ruckert, S. Hagen, W. Yunair, A.T. and Palm, H.W,: Metazoan Parasites of Fishes and their potential use as a Bioindicator in the SegaraAnakan. Lagoon, Indonesia. Regional Environmental change 2009. 9;315-328
(13) Ashade, O.O., Shineye, O.M, and Kunoye, E.A.; Isolation, Identification and Prevalence of Oreochromis niloticus in three selected river sytems. Journal of Fisheries and Aquatic science. 2013. 8(1):115-
, 2013 Academic Journal Inc. 2013.
(14) Okaka, C.E. and Omoigberale, O.M.; Parasites of Fishes of Okhuaohe River, Edo State. African Health.Sciences 2002 3;1-2
