Bivalva is a types of aquatic organism that lives in mangrove ecosystems. This research aims to determine the types and density of bivalve in the mangrove ecosystem of Sungai Asam Village. The research has been conducted on July to August 2020. There were 3 stations set, St1 is a mangrove forest area that is relatively natural and far from residential area, St2 was in the mangrove forest which …