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Ninawe, A S and Paulraj, R (1995) Effect of salinity on the growth and nitrogen fixation of Azotobacter chroococcum. Journal of Aquaculture in the Tropics, 3. pp. 55-59.
Dorairaj, K (1995) Hand Book on Aquafarming: Trout, Eel, Freshwater Prawn, Cray fish. Manual. MPEDA, Cochin.