I've caught them in my ponds on shiners, fatheads, worms, and artificial feed pellets.

I've never caught one on a lure, but I would say that's more on me as I don't lure fish much at all.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."