I fish a couple of Conservation lakes in the under 200 acre size. I try to keep a limit every time if I can find em. That means keeping some as small as 7", but as it was said above, if there is a 30 limit with no size restriction... they want you to keep them.
Harrisonville lake is horrible for crappie. Tons of em. One day I dipped a double jig rig in a clump of trees, caught 70 consecutive crappie, only five were worth cleaning. Talk about stunted and starving...
I'd probably have done a service by pinching their little head and letting the turtles have em.
The best way to get to where you want to be in the future is to act like you are there TODAY.