A low-cost battery-powered amplifier for locating electric fish in the field
Locating and capturing weakly electric fishes (African mormyroids and South American gymnotiforms) in the field is made substantially easier by the use of a hand-held, battery operated amplifier attached to an electrode lowered or cast into the water. The amplifier converts the electric impulses of the fish into audio, allowing the user to determine the presence, proximity and approximate number of individuals within one to several meters from the electrode, depending on the size of the fish.