And interesting article in the March 2017 Indiana Game and Fish magazine. The mystery lake is KY lake and the fishery biologist is Paul Rister. He is a very good fishery biologist who had caught and tagged different species of black and white crappie and radio tagged them to study their movements. His research is very interesting and he has learned a lot about how crappie move during cold fronts both horizontally and vertically. Read this article if you want to learn how crappie move around in the lakes you fish. Black crappie go into the shallower water that's clear and the white crappie prefer the murkier water and they will stay out a little deeper. Read the magazine article or Paul's research on the KY IDNR web site and learn more about the movements of black and white crappie in the spring of the year.