Abstract: Reduction of alkalinity via aquaculture＇ is an effective approach to exploit 46 million hm^2 saline-alkali waters in China. The osmotic pressure, energy budgets, growth and development, organization function, plasma electrolyte concentration and many oth- ers aspects in fish are influence by high salinity in the water, and the high alkalinity leads to ＂alkali disease＂ and various abnormal re- actions of physiological, biochemical and behavioral, even quick death. Some synergistic effects of salinity, alkalinity and pH are found, and the higher concentration of saline-alkali than the normal values will result in synergistic toxicity in the fish, with the more synergistic effects with increase in pH values. The information on effects of salinity, alkalinity and pH on growth and development in fish is summarized, and the growth mechanism of fish in the saline-alkali waters is discussed in order to provide theoretical basis for the development and utilization of the low-lying saline-alkali waters.

Key words: fish, salinity, alkalinity, pH, growth influence