They grow fast if they have plenty of food. As a predator they accept fish food well. Fun to feed and catch. Do not reproduce so you have good control of their numbers. Artificial feeding can suppliment for lack of preyfish. If you do not like them quit stocking them and after several years a conversion can be made to another type of fishery.

aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management