Relatively few small-scale farmers culture fish, even in Asia, as the
gap between the traditional supply - wild fish - and the demand has be
gun to widen only relatively recently. Rapid human population growth,
overfishing and environmental degradation are providing a stimulus for
the growth of aquaculture but sustainable systems of production remai
n to be developed for most areas. A balanced model involving both on-f
arm and off-farm resources is required to promote aquaculture so that
it can fulfil its potential and contribute significantly to people's w
elfare, Rising expectations and the poor resource base of most small-s
cale farms dictate the need to intensify nutrient flows and productivi
ty through increased levels of off-farm inputs, as outlined here for r
esource-poor northeast Thailand.