This paper describes the role of the mangrove forest ecosystem as a habitat for marine organisms by using quantitative and qualitative analysis. The data are taken from related literature which is then described further. The data obtained show that mangrove forests in Indonesia are estimated to cover an area of 4.25 million hectares, only about 2% of the total land area, but their economic and environmental values should not be underestimated, therefore their presence must be maintained. As a transition zone between terrestrial and marine ecosystems, mangrove ecosystems have long been known to have many functions and are an important link in maintaining the biological balance of coastal ecosystems. The mangrove forest ecosystem is an important habitat for marine organisms. Generally dominated by molluscs and crustaceans. These mollusks consist mainly of Gastropods and are further dominated by two families, namely Potamidae and Ellobiidae. As for crustaceans, it mainly consists of Brachyura. Some mangrove fauna is also known as consumables and is economically important such as Terebralia palustris, Telescopium telescopium (Gastropoda), ancient Anadara, Coaxans polymesoda, Ostrea cucullata (Bivalvia), and Scylla serrate, S. olivacea, Portunus pelagicus, Epixanthus dentatus, Labnanium polytum (crustaceans).

Keywords : Mangrove Forest, Mangrove Ecotourism, Mangrove Ecosystem, Molluscs