A parasitic survey was conducted from March 2017 to March 2018 to highlight the spatial distribution of the gill monogenean, Dactylogyrus fotedari Gusev, 1973 from Labeo calbasu Hamilton, 1822 of different localities of YSR Kadapa District, Andhra Pradesh using routing parasitological techniques. A total of 2123 Dactylogyrus fotedari Gusev, 1973 was obtained from the gills of these 122 fishes with a prevalence of 75.4%, mean intensity of 23.07 and mean abundance of 17.4. The parasite showed an aggregated distribution pattern (70.04). There was a negative but weak relationship between the intensity of infection and the relative condition factor. The parasite exhibited seasonal fluctuation; the maximum intensity of parasite infection was recorded in winter and minimum in the summer season. The small sized fishes ranging between 80-100 mm were showed high parasitization followed by the large sized fishes ranging from 120-140 mm, whereas the medium sized fishes showed minimum infection. The host sex has no significant effect on the parasitization. No specific preference for the right or left side of the fish host was observed and the parasite species colonized the middle arches (Gill arch II and III). This type of studies will help the aquculturists to implement many advanced aquaculture practices and increase the productivity of Labeo calbasu in the Southern states of India.
