Magnesium is regarded as an important cation in cell biochemical reaction. It takes an important role in all of the energy metabolism, and catalyses or activates more than 300 kinds of enzymatic system. Advances in magnesium nutritional researches for fish were reviewed in this paper, including magnesium deficiency, absorption and metabolism, effects of magnesium on growth, nutrient composition, fat metabolism, immunity and osmoregulation in fish, magnesium-nutrient interactions, the bioavailability and requirement of dietary magnesium for fish, as well as the mechanisms of magnesium nutritional physiology, in order to supply references for a comprehensive view of magnesium in fish nutrition, advanced researches for future and scientific application of magnesium in fish feed.［Chinese Journal of Animal Nutrition， 2011， 23（6）：930 -936］
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