Minnow traps baited with food work well to remove 2-3" GSF. You can enlarge the hole in the trap to 1.5 to 2" but you have to check the trap 15 to 30 minutes after baiting because with the larger hole the fish can find their way back out as soon as the feed is gone.
I have not used a larger trap for a while to try and get them but I have one and I should try that in my forage pond where I try to keep the GSF numbers down because I raise RES fingerlings in that pond. Hook and line works well for the larger ones.
