Prevalence of ectoparasites in carp fry and fingerlings of Rajshahi district, Bangladesh.

The Study has been carried out to find out the prevalence of ectoparasites of carp fry and fingerlings during June 2010 to May 2011 from Rajshahi district, Bangladesh. Four groups of ectoparasites viz. myxozoan, ciliophoran, monogenean and crustacean were recorded from 560 species of endemic and exotic carps collected from Rajshahi District, Bangladesh. The highest ectoparasitic prevalence (37.5 %) has been recorded for ciliophoran group in winter and the lowest prevalence in crustacean (5 %) in summer. However, no crustacean was recorded in Rainy season (June-September). The seasonal highest ectoparasitic prevalence (25 %) was recorded during the winter season (October to January) while the lowest prevalence (11 %) in rainy season (June-September). The study shows that the carp fry and fingerlings are most susceptible to ectoparasites in winter.