I have a friend who bought one in Wisconsin. It was a 60-acre lot with natural springs that fed a small creek and seven small ponds. Each pond had a different variety of fish: trout, bass, catfish, sunfish, and bluegills, that I can remember. The hatchery itself was a large concrete tank, fed by the same springs, but it had no fish in it.
He leased 40 of the 60 acres to corn farmers, set up a trap-and-skeet shooting range, and built a resort bed-and-breakfast to replace the old house. He also sold the spring water to Nestle for its bottled water.
It was a very nice place, and I spent several weekends there before it was opened for business. He had golf carts stocked with fishing poles and tackle for anyone who wanted to fish on the property. His wife cooked breakfast in the kitchen, made sack lunches to take with, and had a large menu for the evening meal. The bar was small, but the intent was that you make yourself a drink and take it into the Great Room to sit by the huge fireplace.