Feeding practices have great implications both in terms of economics and in terms of ecology. The following points are of interest: feeding frequency, feed allowance and feeding strategy. The feeding frequencies depend upon body size and temperature which affect the transit rate. As regards ration levels, farmers rely upon either feeding charts provided by feed manufacturers or their own empirically derived feeding charts. Recent proposals are based on nutritional bioenergetic principles : growth prediction and adequation of supply to meet the digestible energy (DE) needs. The basic idea behind is that the voluntary feed intake (VFI) is driven by DE needs. A more interesting and reliable alternative is to let the fish eat to satiety by themselves, using more or less sophisticated feed distribution systems. Such demand feeding systems have the advantages of taking into account the behavioural rhythms and the nutritional quality of the diets.