Electrofishing  uses electricity to stun fish before they are caught. Electrofishing is a common scientific survey method used to sample fish populations to determine abundance, density, and species composition. Electrofishing results in no permanent harm to fish, which return to their natural state in as little as 2 minutes after being stunned.

The current runs from the anode to the cathode, creating a high-voltage potential. When a fish encounters a large enough potential gradient, it becomes affected by the electricity

The effectiveness of electrofishing is influenced by a variety of biological, technical, logistical, and environmental factors. The catch is often selectively biased as to fish size and species composition.