If you can get your hands on an eel net double sided one that will catch you hundreds. I use a dead rabbit or pigeon in the trap that I have shot, road kill just as good. Set the trap away from the bank for bigger crays you get the smaller ones closer in. They do burrow into banks so a slightly rocky stony area will be best, leave the trap 2 days and there will be hundreds in if its like my ponds. All that's left of the bait is the odd bone, they start to eat each other if you leave them any longer. Grade the crays throw back the small ones (if your allowed to) and hey presto a couple of hund