In some areas, I'd buy that you can take a bunch out and it will sustain a healthy population. Unfortunately, in most places most people think they need to keep every fish that's legal to keep every time they go out! This leads to a lot of the big fish getting pulled out of the lake, and the dinks taking over. I'm all for keeping some bluegills or crappie or whatever for a meal or four, but you don't have to keep fish all the time to be a successful fisherman.
Sorry for the rant. The locals around here get on my nerves about this type of stuff...

Zac