Population ecology and infestation of monogenetic trematodes in juvenile carp fishes of Mymensingh

Investigation on infestations of monogenetic trematodes of juvenile carp fishes of different nurseries of Mymensingh region was conducted during November 2002 to February 2004. Five government farms and five private farrri, were investigated for this purpose. Juveniles of commonly cultured species of Indian major carps- 'Labe° rohita, Cirrhinus mrigala, Catla catla and Labeo gonia; exotic carps- Hypophihalmichthys molitrix, Cyprinus carpio, Ctenopharyngodon idella, Aristicthys nobilis and Barbodes gonionotus were examined for parasitic infestation. The infestations were found in both Indian and exotic juvenile carps in government as well as private farms. Prevalence (/o), intensity and abundance were found to be species specific and also varied with seasons and management systems (government or private) practised in different farms. The highest prevalence and mean intensity were found in C. mrigala and the lowest in H. molitrix. The prevalence in Indian juvenile carps was significantly (p <0.01) different from that of exotic juvenile carps in both government and private farms. Significantly (p