This project work studied and compared the common protozoan parasites of Africa cat fish (Clarias gariepinus) from wild and cultured environment within Bauchi metropolis, a total of 48 samples of C. gariepinus comprising 24 each from both wild and cultured environment were examined for protozoan parasites and only 18 and 13 fishes were infected by protozoa parasites respectively. Ichthyophthirus multifiilis was the most common protozoan parasites found in C. gariepinus from the wild and Trich...