Rowly -- we have been monitoring the yellow perch spawn around here (east-central SD) this year. Yesterday, we found our first perch egg masses, but only in a small wetland. We have not yet found any egg masses in any of the larger lakes. So, I'm not sure how your climate relates to ours, but our ice was off at least a couple of weeks before yours, and the perch spawn is just about to start.
Dave
