Missouri does have a culling exemption for sanctioned bass tournaments...I left that out trying to be brief.
A Few Words About Culling
Any fish you catch is included in your daily limit unless you release itunharmed immediately. You may not replace smaller fish in your possessionwith larger ones caught later. You need to make a keep-or-release decisionas soon as the fish is caught.There is one exception: If, from September through June, you are aparticipant in a bona fide catch-and-release black bass tournament (oneafter which all bass are released alive) that requires entrants to have a boatlivewell with adequate capacity and a pump constantly adding fresh orrecirculating water, the black bass you release unharmed from the livewellneed not be included in your daily limit. At no time may the daily limit be exceeded.