Top Arbroath angler (Rab Gallagher) gave me a good tip end of last season - frozen edible peeler wings. Said it out fishes anything, even the same fresh. He thought the freezing broke down the cells a bit, making scent trail better. Not tried myself, but I thought interesting and imagined some of the keen lads on here would too. Almost got to be a crabber to get it in any quantity mind.