you can tell pretty quickly from the fish you ketch if they have an issue or not. if your bass are stunted and other species affected you can do X, which is taking out bunches of smaller bass and eating em. have done this myself on couple lakes and things go into balance in a couple of years and then the bass get fat and healthy. if you have a ton of smaller crappie or BG then you simply open up the gates and take a bunch out and again doesn't take long to get em back where they should be and introduce more top end predators.
like you said outlaw it makes you mad to see good folks get taken advantage of when there isn't a problem in the first place.