Most important diseases of cage cultured marine fish with emphasis on Asian sea bass( lates calcarifer) and prevention methods

In result of Fresh water crisis and water depletion on the world, attention to marine aquaculture has been most in last decades.so many country in the world try to developed marine cage aquaculture but many diseases and mortality as well as economic losses of producers reports indicated that disease as important challenges of this sector in the future. The incidence of diseases in cage culture systems could be genetically, nutritionaly,environmentaly(Physico_ chemical parameter of water and industrial water pollution), Mechanical damage and infectious disease(parasite, bacteria, fungi and virus). Among bacteria vibrio harveyi, Tenacibaculum maritimum and streptoccosiss inai are the most important with significant economic losses. As well iridovirus and betanodavirus are two high potential disease incidence in marine fish aquaculture. Asian sea bass iridovirus disease is scale drop syndrome (SDS) and betanodavirus is viral nerves necrosis(VNN) are two important disease of Asian sea bass aquaculture. Given that in aquaculture, health management and diseases prevention are superior to treatment so in marine aquaculture especially in cage system, stocking of SPF Fry& Fingerling, vaccination or vaccine therapy, using probiotic& prebiotic instate of antibiotic therapy and chemical drug are mentioned.