This little gem might help anglers pestered by crayfish when fishing but won't exactly trap them.
Get a large tin of cat food.
Puncture the lid and side at an angle.
Thread some strong string through the two holes.
Puncture both sides and base several times (a screwdriver or braddle does the job).
That's two parts vodka, plenty of ice and topped up with fresh orange juice. (Don't know the cocktail recipe for a 'braddle' though!)
If you are margin fishing, lower the tin into the water about five yards or a bit more from where you intend to fish your baits.
If you are fishing a bit further out then you can chuck it into the swim, again away from your baits.
I suppose you could even send it out on a bait boat (the mind boggles!)
The pesky crayfish are attracted to the tin of cat food and leave you and your baits in peace .... clever eh?
Most important - remember to remove the tin and take it home with you after fishing.
Two problems however.
1. Some waters don't allow tins.
2. Big fish tend to like eating crayfish (that's why they are growing so fat on certain waters) and they might be attracted to your tin of cat food 'miles away' from your baits!!!
Well, I thought it was a good scheme, until I thought about it!
Seriously, it does work and solves the problem in some instances.