fowells, if you find an effective trap that lets you control numbers or crayfish many of us are all ears! I've tried different traps and baits and can't seem to reliably get them to come in the trap and stay in.
If you are only raising forage then muddy water won't be a concern, it will keep it algae and weed free. Aeration would still be a plus for better survival and carrying capacity.
You might still want to pick a species like SMB that target crayfish and put a small number in (they possibly could reproduce) and keep the small number. They would certainly get some of your forage fish but probably would help preferentially nab the crayfish. Easy pickings for them if not much rip rap or other suitable hiding spots in the way.
