Movie 2

Commercial electrofishing fails to show any effect on the electric catfish. Representative videos of a goldfish and an electric catfish show the marked difference in the effect of stronger and long lasting (3-4 s) electric fields (100 Hz pulsed direct current, peak voltage gradients of 3 V/cm) that are typically used in electrofishing operations and that immediately narcotize the control goldfish. The yellow warning signs illustrate the timing of the electric shocks. Videos are shown at fourfold speed.