The reason why the government is concentrating of food fishes rather than ornamental is of national interests - to have an alternative source of seafood in case we quarrels will our neighbors or drop of supplies from our neighbors.
However, the truth is that most of the farms here are not able to sell them in locally due to the fact that Singapore is a free market and big boys super marts rather buy direct from oversea due to price. From my limited knowledge most of the fishes are our farms are sold to Hong Kong. icefire is right on this...
There were several efforts to sell their fishes directly to consumers by the Singapore farmers but the demands is low as consumers awareness is low. Some farms tried to create awareness by organizing farms visits but this is against AVA guidelines - Only authorized personnel are allowed on the farms, no casual visitors.
Anyway, I am all for the national interests thingy by AVA but I strongly feels that the bureaucrats will for once think about the farmers survivalabilty issues as well. Like for example encourage some ministries such as Mindef or Home to buy certain percentage from these local farmers. With this, the farmers will be able to have some regular income to sustain their living and when there's a crisis, they will be more willing to sell their fishes to the government.
Just my thoughts.....