One of the most important tropical and sub-tropical coastal wetland types are mangrove swamps, which occur in inter-tidal saline areas and estuary mouths and work as a connection between the land and the sea. Mangrove ecosystems provide a range of direct and indirect services to society are highly bio-diverse and form a habitat to a variety of flora and fauna. Mangroves are a threatened ecosystem and the threats are due to some inherent reasons like mangrove areas are highly productive, they are situated in prime seafront location, the important services of mangroves are indirect, invisible, occur off-site, etc. As against this, their conversion for meeting subsistence requirements or for developmental activities (road, ports) or commercial activities (aquaculture, resorts, etc.) provide returns, which are direct and commercially very significant.