Abstract
Fish caught by electrofishing are usually held in live tanks before appropriate data are recorded; however, if the tank water is not circulated, changes in water temperature and oxygen concentration may harm the fish. Also, if the water is circulated by pumps or other mechanical means, the power required may reduce the effectiveness of the electrofishing gear. We designed and successfully used a live tank which is submerged through the hull of a catamaran-type white-water raft. The live tank is placed in the water being electrofished so that power-free but continuous water circulation is maintained. Fish in the tank are protected from the electrofishing field by the design of the tank, which uses to advantage a phenomenon known as Faraday shielding. The tank is easy and inexpensive to construct and safe to use.
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