This is a pretty standard fish chowder with some Polish flair tossed in. I of course used Lake Erie yellow perch, but any firm fish will do. Use a good chowder fish like perch, tautog, tilefish, sturgeon, cobia, California white seabass, grouper -- the key is firm and white. Most good Polish kielbasa sausage is smoked, and while you can use whatever sausage you want, make sure it is smoked. You want that flavor with the mild fish. The dill really adds something to the stew, but if you hate it, use parsley instead. As for the sour cream, put it in a bowl at the table and let people add it to their liking.
If you are looking for a chowder that works well with Great Lakes salmon and lake trout, try my Salmon Chowder.