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It all depends on which part of the country you are in, and when the Tilapia are stocked in the pond. (If the primary reason for stocking is FA control)

Up here in the north, if the FA gets a good jump on the Tilapia, even 40# per acre isn't enough to get back ahead of the FA.

If you don't want forage for your predators (i.e. your pond goal is to have large BG and you want the LMB to eat the YOY and small BG) then stock 90+% Male Tilapia like they grow for the food industry. They won't last as long in the pond as pure Blue Tilapia (water temp wise) but they'll still eat the FA, although not as much as constantly spawning pure Blues.