Percentage And Seasonal Variation of Fresh Water Molluscs In Daha River Of Siwan (North Bihar)

Molluscs diversity of Daha river (Siwan) was studied during year 2019-21 to seasonal variation. Fresh water Molluscs are the integral Part of every aquatic ecosystem and help not only in the ecosystem's functioning but also enable the ecologists to judge the health of their abode. These shelled animals are used as the best biomonitoring tools worldwide. During the study period pre-monsoon, monsoon and post-monsoon, total 25 species were collected.