Take what's left after filleting a mess of panfish, and put into a styrofoam cooler. Add corn meal and flour to thicken. Also add anything else that comes to mind to spice-up your mix, like chewing tobacco, cheese, old fishing scent that's been sitting for years, etc.
Cover cooler and wrap in duct tape. Place cooler on roof, away from animals, and let bake in sun for a few days. Mix paste and use on dip worms, or spoon into cheese cloth or the misses' stockings.
Nasty stuff, but it'll work something powerful.