What kind of fish native to say Michigan could you keep in a 55 Gallon? I have heard of Pumpkinseed Sunfish but can't find any around here. Any thoughts?
My blue gill is about 4", i think most of the other sunfish/panfish have more color than blue gill. For color i probably would recommend a different sunfish. Maybe 2 or 3 in a 55... Im not sure. U could probably keep other things with em, mines very peaceful except to fish it can fit in its mouth. Heres another pic:
Rock bass are probably the most aggressive fish youll find native to here. I've gotten bitten a couple times when swimming. Ive kept a couple of 3-4"ers for a week or so.
YOu could try doing some research on what you have around that area. Here is a good start... http://www.rbff-education.org/cgi-bin/search/rbff.cgi?ID=1073261437
I recommend the rock bass, they are both pretty and interesting and should not outgrow a 55g. I would not recommend something like a bass as they will outgrow that tank. If you cannot find any wild fish then perhaps you can find a hatchery that sells them nearby or maybe you could bye one online. http://jonahsaquarium.com/fishlist.htm#north american
Good luck and enjoy whatever fish you get, natives are great.
a few shellcrackers (redear sunfish) and eaither madtoms or a bullhead cat. ive got a green sunfish, or a regular bluegill (cant tell at its size) and a shellcracker both 4inches with my 12" oscar.