The last drain, in 2003, was an awesome time. They doubled the limits you were able to keep. I heard later on, they removed the limits all together and relaxed the rules. I had a friend tell me he was down there dipping up fish for his own pond.
I heard they kept some fish in retention ponds as well, but I think the ponds just held fish the replenish after the refill, I don't think they kept anything from the original cast.
That year we ice fished until March 13th....far cry from this year