Tracy, LMB and SMB will control crayfish especially since you no longer have plants for them to hide in. However if they have rocks/rip/rap to hide in then it might balance out again.
I'd like to take some of your texas Red Swamps and pit them against our 'invasive' northern Rusty crayfish. Load a small forage tank up with 100 of each variety and at the end of the summer see which variety is tougher !
