Ectoparasitic infestation of the Nile Squeaker, Synodontis schall (Bloch and Schneider, 1801) from the Cross River Estuary, Nigeria
The objective of this study was to determine the abundance, intensity and prevalence of ectoparasites of Synodontis schall from the Cross River Estuary, Nigeria. A total of 150 fresh samples were collected between May and October, 2013 from the catches of the artisanal fisheries at Nsidung beach. The skin, gill and fin scrapping were prepared from each specimen and examined following standard methods for microscopic analysis. The results showed that 21 specimens were infested with 77 ectoparasites belonging to five species, including Trichodina sp., protozoan cyst, Ergasilius lizae, Dactylogyrus sp. and Gyrodactylus sp. with an overall prevalence of 14.0%. Infestation rate was highest in 10-14.9 cm class size (53.55%), followed by 15-19.9 cm (34.00%), â‰¥20.0 cm (8.00%) and 5-9.9 cm (4.67%) size classes. Parasites were more prevalent in the gills (82%), followed by the skin (14%) and least (4%) in the dorsal fin. Prevalence and abundance of ectoparasites was highest (28.57% and 0.71) in 5-9.9 cm size class, followed by 10-14.9 cm (16.25% and 0.60), 15-19.9 cm (9.80% and 0.41) and â‰¥20.0 cm (8.33% and 0.25) classes. Prevalence and abundance of ectoparasites was higher in female (15.63% and 0.56) than male (11.11% and 0.43). Dactylogyrus sp., Trichodina sp., protozoan cyst and E. lizae exhibited organ specificity as they were specifically recovered from the gills whereas Gyrodactylus sp. was found in the skin and fin. However, it was concluded that to prevent zoonosis, S. schall should washed with clean water and cooked properly before consumption.
Akpan E.R., Offem J.O. (1993). Seasonal variations in water quality of the Cross River, Nigeria. Revue Hydrobiologic Tropicale, 26(2): 95-103.
Alam M.J., Rakibuzzaman M., Hasan M.M. (2010). Comparative study of endo-parasitic infestation in Channa punctatus (Bloch, 1793) collected from Hatchery and Sewage lagoon. Nature and Science, 8(5): 152-156.
Aloo P.A., Anam R.O., Mwangi J.N. (2004). Metazoan parasites of some commercially important fish along the Kenyan Coast. Western Indian Ocean. Journal of Marine Science, 3(1): 71-78.
Amare A., Alemayehu A., Aylate A. (2014). Prevalence of internal parasitic helminthes infected Oreochromis niloticus (Nile Tilapia), Clarias gariepinus (African Catfish) and Cyprinus carpio (Common Carp) in Lake Lugo (Hayke), Northeast Ethiopia. Journal of Aquaculture Research and Development, 5: 233 doi:10.4172/2155-9546.1000233
Anderson D.P. (1974). Fish immunology. In: F. Sneiszko, F. Axelrod (Eds.), Diseases of fishes Stanisias. H.R.F.H. Publication Inc. New Jersey 07753, USA. 151 p.
Auta J., Oniye S.J., Adakola J.A. (1999). The helminth parasites of the gastrointestinal tract of Synodontis species in Zaria, Nigeria. Journal of Pure and Applied Sciences, 2(2): 47-53.
Ekanem A.P., Eyo V.O., Ekpo I.E., Bassey B.O. (2013). Parasites of Blue Crab (Callinectes amnicola) in the Cross River Estuary, Nigeria. International Journal of Fisheries and Aquatic Studies, 1(1): 18-21
Ekanem A.P., Eyo V.O., Sampson A.F. (2011). Parasites of landed fish from Great Kwa River, Calabar, Cross River State, Nigeria. International Journal of Fisheries and Aquaculture, 3(12): 225-230.
Ekanem A.P., Eyo V.O., Udoh P.J., Okon J.A. (2014). Endo parasites of landed fish from Nsidung beach, Calabar, Cross River State, Nigeria. Journal of Scientific Research and Reports, 3(6): 810-817.
Eyo J.E., Iyaji F.O., Obiekezie A.I. (2013). Parasitic infestation of Synodontis batensoda (Rí¼ppell, 1832, Siluriformes, Mockokidae) at Rivers Niger-Benue Confluence, Nigeria. African Journal of Biotechnology, 12(20): 3029-3039.
Eyo V.O., Edet T.A., Ekanem A.P. (2015). Monogenean parasites of the African catfish Clarias gariepinus cultured in Calabar, Cross River State Nigeria. Journal of Coastal Life Medicine, 3(6): 930-934.
Eyo V.O., Ekanem A.P., Eni G.E., Asikpo P.E. (2013). Relationship between fecundity and biometric indices of the Silver Catfish Chrysichthys nigrodigitatus (Lacepede) in the Cross River estuary, Nigeria. Croatian Journal of Fisheries, 71: 131-135.
Fischer W., Blanchi G., Scott W.B. (1981). FAQ species identification sheets for fishery area 7, Canada found in trust Ottawa, Canada by arrangement with FAQ. pp: 34- 47.
Klinger R.E., Floyd F. (2002). Introduction to Freshwater Fish Parasites. Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida.
Madanire-Moyo G., Barson M. (2010). Diversity of metazoan parasites of the African catfish Clarias gariepinus (Burchell, 1822) as indicators of pollution in a subtropical African river system. Journal of Helminthology, 84: 216-227.
Obiekezie A.I., Ekanem D. (1995). Experimental infection of Heterobranchus longifilis (Teleosti: Clariidae) with Trichodina maritinkae (Ciliophora: Peritrichida). Aquatic Living Resources, 8: 439-443.
Obiekezie A.I. (1995). Chemotherapy regimens for diseases management in the nursery phase of African catfishes (Clariidae) (Ext. Abstr.) First African fisheries Congress (Fish '95), Nairobi Kenya.
Obiekezie A.I., Moller H., Anders K. (1987). Disease of the African estuarine catfish Chrysichthys nigrodigitatus (Lacepede) from the Cross River Estuary. Nigeria. Journal of Fish Biology, 32: 207-221.
Objekezie A.I., Enyenihi U.K. (1988). Henneguya Chrysichthys Sp. Nov (Protoza: myxozoa) from the gills of the estuarine catfish, Chrysicthys nigrodigitatus (Lacepede) in the Cross River Estuary Nigeria. Journal of African Zoology, 102: 33-42.
Olofintoye L.K. (2006). Parasite fauna in some freshwater fish species in Ekiti State, Nigeria. Pakistan Journal of Nutrition, 5(4): 359-362.
Otubisin S.O. (1986). Some ornamental fish species in Lake Kainji and some tips on aquarium fish care. Fisheries enterprise and information brochure. 5th Annual Conference of Fisheries Society of Nigeria (FISON). Kainji Lake Research Institute, New Bussa. pp. 35-37.
Paperna I. (1996). Parasites infections and disease of fishes in Africa. CIFA Technical paper no. 31 food and agriculture organization, Rome.
Poulin R. (2000). Variation in the intraspecific relationship between fish length and intensity of the parasitic infection: Biological and statistical causes. Journal of Fish Biology, 56: 123-137.
Reed P., Francis-Floyd R., Klinger R., Petty D. (1996). Monogenean parasites of fish. FA28, Fisheries and Aquatic Sciences Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Reviewed January 29, 2015 at http://edis.ifas.ufl.edu.
Roberts R.J. (2000). Fish pathology. 3rd edition. Hagerman, Idaho. 472 p.
Steffens, W. (2006). Freshwater fish – wholesome foodstuffs. Bulgaria Journal of Agricultural Science, 12: 320-328.
Teugels G.G. (1996). Taxonomy, phylogeny and biogeography of catfishes (Ostariophysi, Siluroidei): An overview. Aquatic Living Resources, 9: 9-34.
Ugwuozor G.N. (1987). A survey of helminth parasites of fish in Imo River, Nigeria. Journal of Fisheries and Hydrobiology, 2: 23- 30.
Upadhyay J., Jauhari R.K., Devi N.P. (2012). Parasitic incidence in a cyprinid fish Labeo rohita (Ham.) at river Song in Doon valley (Uttarakhand). Journal of Parasitic Diseases, 36(1): 56-60.