Abstract
There are, at present, at least 42 species of fish inhabiting Kaliveli floodplain and Uppukalli creek. Six species are confined to the flood plain, 19 are estuarine and 17 occur in both floodplain and creek. The IUCN Red List Category / Conservation status of 21 species could be determined : 1. Endangered, 5 Vulnerable, 14 Near Threatened, and 1 Least concern. The only exotic was Oreochromis mossambica which is an Alien Invasive species. High concentrations of Chlorides around prawn farms exist, and this could have adverse effects on aquatic biodiversity.