One of the oldest methods of attracting fish is to use chum. Chum can be a variety of things such as chopped-up baits,blood,and so forth which are dumped into the water to entice fish to bite. It can also be some of the many food products found on your local grocery shelves. The next time youre out fishing try this:
Punch a few holes in a can of sardines or canned cat food and lower it over the side of the boat or through an ice hole. The oils and ingredients will spread out of the holes attracting various types of fish.
I know it has drawn panfish my way when I tried it. I heard of this technique probably 20+ years ago and tried it out...seemed to work quite well. I used the sardines and then the cat food. Both had same affect I thought.
Not sure what the laws are in Wisco but you might want to look into chummnig before trying it in MN. I have heard varying answers to whether it is legal or not, some say that it is and others say its not. You might want to talk to your local CO before giving it a try, don't want to end up with a light wallet at the end of the day.