Someone taking a couple dozen crappies to improve his stock isn't a drop in the bucket for the lake. The pressure on a lake like CC is much greater from locals that take fish home for the table. Even that though isn't what effects a lakes population. Lake conditions, management, predators, and foreign species that effect spawning are a much greater threat than fishing pressure. If people would simply harvest average fish and return the monsters to the lake the lakes trophy population and quality spawning results would continue. If I were in control of fish management at CC I would implement a slot limit with one trophy fish over the slot allowed per day unless the population of monsters is just so impressive that they need to be thinned. I seriously doubt there are any lakes that have that problem though.