Hatcheries operate for a variety of reasons. A stock that has been cultured for a while is adapted to being cultured. They will perform better in the hatchery. Given the current levels of wild stocks, you would be mining them to get broodstock, you would have to go through generations of adaptation, and so on.

Starting with local stock would be the best idea, but that horse has left the barn.

A big question to be asked is why do we want to have a hatchery? If the system has reasonably good habitat, why not use what nature gives you? Hatcheries should be used in otherwise unusable systems.