A longer size limit on Crappie may only be appropriate where there is a healthy but somewhat limited population. It is all very complicated but emotionally high length requirements appeal to me. The lake I fish for example has a 15 inch minimum for Walleye and it makes me shake my head. Who keeps a walleye under 18 inches which is still a pretty small fish. On a lot of lakes a Crappie slot limit seems appropriate but I have never seen one?