author(s)
Inam Ullah, Muhammad Fiaz Khan, Muhammad Seyab Khan, Safir Ullah Khan, Shakeel Hussain and Muhammad Javid

abstract
In the present study two hundred rohu (Labeo rohita) form Dera Ismail Khan, Khyber Pakhtunkhwa were examined for ecto parasites, the copepod ectoparasites found were Lernaea cyprinacea, L. arcuata, L. lophiara. Out of 200 fish, 37 were infested (18.5%). In which the predominant parasite was Lernaea cyprinacea. An overall prevalence of ectoparasites was Lernaea. cyprinacea (18.01%), L. arcuata (15.5%). L. lophiara (10.51). Lernaea. Cyprinacea is the most abundant ectoparasite in the overall study.