Electrofishing

Electrofishing, as you may tell from the name, is the process of using electricity to collect fish. If done correctly, the fish are not electrocuted, but are directed to the source of the current. The electrical current contracts the muscles of the fish, basically "forcing" them to swim towards the pulse. This method is normally used to collect fish for hatcheries or scientific studies.

If done incorrectly, the fish can either swim away from the current (low voltage), or fall into unconciousness (high voltage). Electrofishing can only be done correctly by a trained professional, as many factors alter the effectiveness of pulses. A couple of these factors are minerals in the water, or salinity of the fish, or the size of the fish.