weir feeler

the operator of a weir has to determine the number of fish captured in the weir before striking a bargain with a dealer. A weighted length of copper wire is lowered over the side of a boat in the weir, the weight is held just off the bottom and the wire looped over a finger and, as the boat is rowed around the weir, fish striking the line can be felt and counted. Expert weir feelers can distinguish numbers, sizes and even species caught