Aquaculture,the farming of aquatic organisms such as fish. mollusks,crustaceans and plants, is the fastest growing food production sector in the world. At present, approximately 40% of all consumed fish and shellfish are farmed,and a 70% increase in aquaculture production by the year 2030 is predicted (FAO,2008). This development is essentially related to the increasing demand for sea food in a global context, characterized by the depletion and the overexploitation of the traditional fishery (Pauly et al.2002 Myers;Worm and Myers,2004