Abstract   

One hundred and twenty rohu (Labeo rohita) from Fish Hatchery Mian Channu (Khanewal Punjab) were examined for ectoparasites. The copepod ectoparasites found were Lernaea (L.) polymorpha, L. cyprinacea, L. oryzophila, L. lophiara and L. arcuara. Out of 120 fish 46 were infested (38.34%). The predominant parasite was L. polymorpha. An overall prevalence of ectoparasites was L. polymorpha (26.66%), L. cyprinacea (25.83%), L. oryzophila (20%), L. arcuara (5%) and L. lophiara <5%). L. polymorpha was the most abundant ectoparasite in mixed infestation as well.