Irresistible Bait

Men have always searched in vain for the irresistible bait, and many roach fishermen place more faith in bait than in effective angling.
Example: Someone reports that the roach in a certain water are taking wheat because he or she has just caught some, and from then on, everyone who fishes there promptly stews up some wheat and confirms the original report, after which roach fishing in that water is hardly thought worth trying without a plentiful supply of the stuff.
This continues until, unable to get wheat, some enthusiast falls back on, say, pearl barley. He catches roach, and the news spreads. Soon, pearl barley alone will do, and so it goes on, when plain bread paste would probably be equally effective all along.
Pay more attention to keeping quiet and inconspicuous, choose your swim carefully. This will probably double the size of your catch.