A barra farm near Cairns, Northern Australia has a similar setup.
He had a showpiece pond which was full of white/platinum barra (some over 2 ft long)which was specially bred, although the owner said he did not know what he plans to do with them. If he knew how much they are worth in the aquarium trade (I don't think he does), I think he can make a killing.
Someone wrote in another thread (Ashdavid?) they were worth US$2000 each!