There's certainly a mortality. On another board, BSSP's catch and release season came up, and a poster mentioned they need to add fish during it to keep numbers up.
I do wonder if a C&R area might allow for some growth and bigger fish.
That all said, My main point in my responses was that I wanted them to do what promoted kids and families. The other was that I wouldn't mind if they eliminated the zones entirely. I can't seem to find a good rationale for them. I actually asked that once in an email as to why the parks have them and why they vary from park to park. The answer I got indicated they really didn't know themselves.
In any case, if they want a catch and release area, my thought is to have it an area that is not all that conducive to bait fishing, and then open up some water to bait that's good for a kid and his grandpa to dunk a worm.
More than anything, I want to keep the swimming pool going. I didn't mention it on the form since fishery isn't under the same management, but that is an important part of the park. I know they've had problems running it.