Ichthyofauna assemblage and their spatiotemporal distribution: a case study in Asura beel of Dinajpur, Bangladesh

Ichthyofauna diversity acts as a bio-indicator and is playing significant role in the sustainability of an aquatic environment. The present study explores ichthyofauna assemblage one largest wetlands Bangladesh known Asura beel located Dinajpur district. Fortnightly fish samplings were done from November 2017 to October 2018 considering three seasons winter,summer, rainy. Fish biodiversity was assessed with their threatened status analyzed seasonal abundance indices. Findings revealed total 35 identified species belonging 7 orders, 17 families, 26 genera. According IUCN- 2015, current research recorded 6 vulnerable (17%). While only 1 data deficient (3%), are endangered (17%), other 22 not (63%). Among species, Amblypharyngodon mola Cypriniformes order contributed highest (12%). On contrary, Ostreobrama cotio Macrognathus armatus both represented lowest by contributing 0.35%. survey also reported that indices richness values did vary significantly according although number catches found higher winter season followedby summer rainy seasons.