What stocking rates are reccomended with Tilapia?

I have a one acre pond with bluegill and bass, the fish supplier I talked with is reccomending 60 lbs of Tilapia. The fish he has are about 1/2 pound each. Sounds like alot to me? What do ya'll think? I could not find a definitive answer while searching the forums, sorry if I over looked it.

If wishes were horses, dreamers would ride.

I must admit that I am not a fan of the Catfish \:\)