This might be jumping ahead into the future planning of the pond, but if you do go with stocking Tilapia make sure you build the pond in a way that it can be netted. Which also adds in a maintenance factor of doing it every fall. You will have to decide whether or not the extra work to do that is worth more(or not) of more food on the table. Some folks have skill ( luck? ) in catching them, so far I have not.