The 21 islands between Thoothukudi and Rameswaram shores in the Gulf of Mannar are notified as the first Marine Biosphere Reserve of India. About 36,000 species of flora and fauna exist in the region covered with mangroves, sandy shores, sea grass beds that are conducive for turtle nesting. The region around the Thoothukudi shores are home to rare marine flora and fauna. Coral reefs and pearl oysters are some of the exotic species while algae, reef fish, holothurians, shrimps, lobsters, crabs and Mollusca are very common. Out of 600 recorded varities of fish in the region, 72 are found to be commercially important. The thermal discharge from the thermal plants and excessive brine run off from the salt pans impact the flora and fauna in the region to a large extent
