Abstract:
Extensive study program has been conducted on the Matamuhuri River System of the
Cox’s bazar and the Shibsa River System, Khulna to explore the possibility of
occurrence, collect and to identify freshwater clasmobranch from the waterbeds of
Bangladesh. Two species of fresh water elasmobranch have been identified during the
present study. These are Dasyatis bennetti and Dasyatis zugai. Food and feeding analysis
indicated that these fishes are predominantly carnivorous. During the study, ecological
aspects of the study area were also studied. Two parasites, viz. Argulus sp. and Ergaslus
sp. have been identified. It has been assumed that these clasmobranch Fishes arc not fully
of freshwater but they are merely visitors of freshwater ecosystem. The presence of
premature specimens indicates that these fishes use freshwater ecosystem as their
breeding or feeding or growing ground
