Welcome to the Hoosier State, home to 647 walleyes and 15,000 guys trying to catch them..... Here's a quick overview. Most if not all of the rivers have fair catfish populations, mostly channel cats and bullheads. Major rivers can put up some decent flatties. You've gotta go to the southern part of the state for blues, but some reach biblical
size. For bass, again, the further south the bigger the fish. There are no native trout in Indiana any more. There are a few scattered lakes that get a dump of stocker rainbows once a year. Lake Michigan gives up salmonids and perch, but it's big boat water. Northeastern part of the state has decent pan fishing in the natural lakes. In keeping with the wishes of this forum, this is rather general. It is meant to serve as a start rather than to reveal "hot spots". The DNR website may be helpful as well.
Best wishes,
fish on,
rivereddy