them to commercial size. Afterwards, the
extensive farming gave rise gradually to
semi-intensive and intensive farming. Wet
fish diets were replaced by dry pellets, and
the technology of manufacturing the pellet
also changed to produce hard expandable
granules.
The work field in fish nutrition has had
the basic concern of designing formulae to
reconcile maximum yield and minimum
cost. In recent years, the progressive
development of fish farming, both in
marine as well as continental waters, has
added a new aspect to consider: how the