Juveniles are sexually immature pre-adult stages that resemble the adult morphologically, although in some cases they may exhibit different patterns of coloration. Nursery grounds are usually found near the shore (shallow water) and may be estuaries (Munro et al., 1973), insular shelves of the reef habitats, sheltered inshore areas including mud flats, sandy shores, seagrass and mangrove habitats (Ahmed, 1992). They must have certain characteristic features including abundant food supply and protection from predation.