THE ESTUARY provides an unique habitat with diversified ecological niches where many groups of animals and plants are able to tolerate fluctuation in salinity, degrees of submersion and attachment to substrata. The faunal components in this region consist of an assemblage which have either arrived from the freshwater habitat or from the marine zone and have adjusted themselves in the buffer area further, some species have adapted themselves thoroughly in the estuarine environment and have become dominant in this region.