I have been fishing a sandpit for years and helping to keep the number of fish managed.
One thing I have found that there is no set rules as to what needs to be done. I mean if you plan to help one species of fish something will change with the others. I guess what I am trying to say is that to have a quality fishery with decent fish of all species the game plan will have to change yearly or sometimes even more frequently. Selective harvest is the best way to combat some issues while others are to install slots or C&R programs.