One of our fisheries biologists mentioned that crappie had a 7 year cycle. Can that be explained in more detail? For instance: Is this cycle universal? By that I mean, is the cycle the same everywhere, or does each lake have it's own cycle? Are all crappies in a lake on the same cycle, or is the cycle for whites different than the blacks?

If there are differences between lakes, is it known which lakes are at the better part of the cycle, and exactly how does the cycle progress? Does harvest have any effect on the cycle, and can we as fishermen/women, do anything to improve recruitment during the lows of the cycle?

Is the cycle tied to some other cycle, such as shad?

I know there are a lot of questions here.....so if I only get answers to some, I will understand. If there is any report or study that I could access, please point me in the right direction.

Thanks!