Fishes can be sold to the middle women and men that will re-sell; it can also be sold to restaurants and pepper soup joints. Arrangements can be made with big eateries where continental dishes are served. Importation is also a possibility depending on the capacity of your fish farm.
In a nutshell, fish is consumed by the vast majority and you are sure of having your fish disposed anytime they are ready for sell. It is also advisable that some fish farmers associations within your localities for possible linking with available market.