Abstract

Abstract The current study investigates the correlation of the host oxidative stress enzymes, parasite prevalence with environmental pesticide concentrations using combined parasitological parameters and histopathological alteration index in the Chrysichthys nigrodigitatus. Water, sediment, fish samples and macro-parasites were collected from three stations (Iddo, High rise, Okobaba) of the Lagos lagoon. Twelve congeners of organochlorine pesticides were analyzed in these samples using mass chromatography coupled with electron detector. The fish intestine at each station was analyzed for histopathology and parasites respectively. Antioxidant enzymes were analyzed in the intestines of infected and non-infected host individuals and the macro-parasite species. At Iddo, the congeners detected in water and sediment were; p,p’-DDT, endosulfan 1, heptachlor and aldrin, these were also detected in the high rise. The Okobaba had p,p’-DDT, endosulfan 1, dieldrin, heptachlor and aldrin in the water, sediment, fish and macro-parasites. Myxosoma sp was the most widely spread protozoan infection in the collected fish specimens and showed positive correlation (r = 0.435, p

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