Studies on Helminth (Trematoda: Monogenea) Parasites of Nursery Juvenile Carp Fish of Mymensingh, Bangladesh

Abstract

A study was made to investigate the monogenetic trematodes of common culture juvenile carp species of Mymensingh region from November, 2002 to February, 2004. The common culture species are four Indian major carps-Labeo rohita, Cirrhinus mrigala, Catla catla, Labeo gonia and five exotic carps-Hypophthalmichthys molitrix, Cyprinus carpio, Ctenopharyngodon idella, Aristichthys nobilis, Barbodes gonionotus. Five government farms Maskanda Fish Seed Multiplication farm, Trishal Fish seed Center, Shambhugonj Fish Seed Production and Training Center, Gouripur Fish Production Farm and Fulpur Nursery Farm and five private farms of Boira, Trishal, Churkhni, Gouripur and Fulpur were selected for this purpose. Althogether 618 fish were examined of which 402 were found to be infected with ten species of monogenetic trematodes viz-Dactylogyrus labei, D. catlaius, D. yogendrai, D. chauhanus, D. laniellatus, D. hypophthalmichthys, D. lampam, Dactylogyrus fulpuri. sp. nov. Gyrodactylus sp. 1 and Gyrodactylus sp. II. Eight species of these parasites were found in Indian major carps and six species were recorded from exotic carps. Among these, seven species were previously reported from adult hosts. One new species and five other are new species are newly reported for the first time from juvenile fishes in Bangladesh. The indigenous carp species are more infested with monogeneans in juvenile stage