Abstract:
The carps; Labeo rohita Hamilton, 1822, Catla catla Hamilton, 1822, Ctenopharyngodon idella Valenciennes, 1844, Hypophthalmichthys molitrix Richardson, 1845 and Aristichthys nobilis Richardson, 1845 were collected from earthen ponds reared under semi-intensive conditions. The parasitic examination of these fishes showed that all fish species were infected with crustacean copepod parasite Lernaea cyprinacea and other Lernaea spp. C. catla, L. rohita and C. idella had higher prevalence (62.5%, 68.75% and 76%, respectively) and mean intensity (12.1, 8.45 and 8.84 parasite/fish, respectively) compared to H. molitrix (9.1% and 3.0 parasite/fish). A locally available drug “Thunder” an organophosphate (2, 2 dichlorovinyl dimethyl phosphate) was used to treat lernaeasis in these fish species. Three concentrations (0.10, 0.15 and 0.20ppm) of the Thunder were sprayed on the surface of the infected fish ponds to eradicate lernaeasis. The 0.20ppm dose proved to be the most effective in controlling the infection, without harming the fish. The water quality parameters remained in normal range and suitable for the fish after treatment indicating that ‘Thunder’ has no harmful effects on water quality in fish pond.
Page(s):
415-420
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Zoology, Volume: 44, Issue: 2, Year: 2012