The waters of Persian Gulf and Oman Sea are environmentally unique with an unusual faunal assemblage (Carpenter, et al., 1997). The Persian Gulf is a semi-closed water body connected to the Oman Sea through Strait of Horaiuz, which is 56 km wide at its narrowest point. The maximum width is 640 km with the average depth of 35 m (Reynolds, 1993). The study area is restricted to the Iranian waters of the Persian Gulf and Oman Sea, between longitudes 48deg 30 minE and 61deg 25minE (Figure 1).
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