During the present study, 600 fish were examined for Lernaeid ectoparasites at a commercial fish farm in Multan, Pakistan. Out of 600 fish, only 63 were infested with Lernaea cyprinacea and 74 were infested with L polymorpha. The overall prevalence of L. cyprinacea and L. polymorpha were 10.50 and 12.33%, respectively. L. cyprinacea had highest prevalence (15.38%) in 2100-2500g body weight of fish group, while it was lowest (4.65%) in 100-500g body weight fish group. L. polymorpha had the highest prevalence (23.07%) in body weight group of 2100-2500g, while the lowest (11.56%) in 600-1000g fish weight group. L. cyprinacea showed highest prevalence (12.87%) in fish length group of 31-45-cm, while the lowest prevalence (0%) was in 61-75 cm fish length group. L. polymorpha had the prevalence of 13.0 and 0% in fish length groups of 46-60 cm and 61-75 cm, respectively.