Meadowlark,
I think your "2 to 3 per acre" is right. I forget what the State of Ohio recommends, but I do remember thinking it was excessive. I can tell you that the ponds I spoke of are AT LEAST 10 per acre, & they are literally barren other than some brush they have put in. As I told 1 of the owners, brush will help, but it does NOT replace weeds...there must be weed growth to sustain a viable fishery, IMHO.
Mike