I have (had??) them in my pond in SW MI. I caught them only rarely when they were about 4-5" long. I have not caught any since. They may or may not be there, we may have had some loss to winter weather. However never saw a mortality or a floater and all the other fish appear to have overwintered every winter just fine. We do everything we can to keep the ice clear of snow since we enjoy skating.
I knew that there was a program to stock them in several SW MI lakes. I found the old study where one of these stocking programs was published. But today i found this article (no date) that gives some specifics of where they are surviving. Our longitude is around 43 whereas aurora, NE is 41.
Michigan RES
