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The shortage of human dietary protein can be provided by fish protein, particularly in developing countries, however, this goal may be difficult due to the high cost of good quality fish meals which costs about 40-60% of total input costs in intensive aquaculture enterprises. Nowadays, probiotics are becoming an integral part of the aquaculture practices to obtain high production. Probiotics are live microorganisms which are beneficial to the host organism. The involvement of probiotics in nutrition, disease resistance and other beneficial activities in fish has proven beyond doubt. Among the...