countries where demand for alternatives to traditionally consumed
marine white fish such as cod and haddock has risen sharply
(Fig. 1). A corresponding expansion of ponds has occurred across
the Delta in a spontaneous and relatively uncontrolled manner despite
the imposition of elaborate land use plans, and government
production targets set in an attempt to control the expansion of
Pangasius production have been exceeded almost as soon as they
have been established (Bush et al., 2009)