Thiss might impact the spring fishing a little, but I doubt very much. Historically the Zumbro has not been an outstanding crappie lake for winter fishing for the general masses. Water fluctuations driven by electrical demands are a constant challenge with the fish and I have never seen a lake so affected by weather.
Granted, good bites occur for a few days at a time but they seldom hold together for long periods of time.
I think the sunfish are far more vulnerable to winter harvest. There are some locals who fish that lake on the ice every day and go home with limits each trip. I have seen these persons take home twenty sunfish by mid-morning and come back a couple hours later and start the harvest all over again. And we are not talking about six or seven inch sunfish here either.
Based on what I was seeing in the net at boat-side late into the fall, I would say that the Zumbro was headed for an outstanding spring to begin with.
My last two trips out there were after the buck season ended. Neither of those trips was what could be called a flop….the numbers were iffy, but the size….well, the size was very, very nice. To give you an idea on the size, four fish, eight fillets, were all that Ma and I could eat at a sitting. And we are lovers of fish dinners.
The crappies out there seem to manage themselves from year to year. Those sunfish though….it wouldn’t break my heart to see a six fish limit put on them, with nothing over 8.5 inches being kept. Once those really big sunnies are gone, they’re just that….gone. In lieu of youur question, I think this winter’s lousy ice is probably doing the sunfish a huge favor and we can likely look forward to seeoing a very decent open water season next spring.