Abstract
Freshwater tilapia feeding on a diet containing 1 mmol kg−1 magnesium (control diet: 30 mmol kg−1) grow although at a decreased rate. The diet does not noticeably affect the blood ionic composition. Prolactin cell activity increases in these fish as judged from the enhanced rate of synthesis of 3H-leucine labelled prolactins in vitro and the ultrastructure of the cells. Na+ intake and Na+ loss decreases, and chloride cell density increases, phenomena typical for enhanced prolactin cell activity in tilapia. We conclude that tilapia manage to cope with a dietary magnesium insufficiency and suggest that prolactin is involved in the acclimation to this diet.
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