A friend of mine stocked them in his pond for vegetation control and as a forage base for his bass.
They grew to about 1 lb in size in only a year (as a previous poster pointed out, they die off in cold water temperature in the winter).
I caught a couple in the fall. They were soft biting fish (didn't pull the float under, just hovered there nibbling), but would eat a redworm pretty readily. Never saw one touch a lure, so it looks like live bait is it. Didn't try crickets, but I guess those would work as well.
It was TASTY! You can usually see them really well, as they are so bright colored they often look white while swimming around.
I know one guy that goes to TWRA lakes that get stocked with them, and around the first frost he can dip them out with a long handled dip net as they are in rough shape in the cold.