According to MDC website

"Any fish you catch is included in your daily limit unless you release it unharmed immediately. You may not replace smaller fish in your possession with larger ones caught later. You need to make a keep or release decision as soon as the fish is caught. There is one exception: if from September through June, you are a participate in a bona fide catch and release black bass tournament (one after which all bass are released alive) that requires entrants to have a boat livewell with adequate capacity and a pump constantly adding fresh or recirculated water, the black bass you release unharmed from the livewell need not be included in your daily limit. At no time may the daily limit be exceeded."

Does this mean you cannot cull in any crappie tournament or cull crappie at all? And can you not cull in a bass tournament in July and August? I do not cull crappie anyway and very very rarely fish a tournament. I also did not know that you can use more than three poles (two on the Mississippi River) as long as the additional poles are marked with your full name and address or Conservation number. I really don't understand what the point of that is.