The distribution of six species crabs with reference to the distance from the estuary is shown in Figure 4. M. messor and S. smithii were distributed all along the transect while M. thukuhar was restricted to a distance of 20 m from the estuary . Juvenile crabs of the unidentified species were also restricted to 0-10 m region of the transect. E. vwesicolor was observed more landwards and its distribution range was from 30-50 m.