Which charging technique reduces exposure of stunned fish in electrofishing?

The technique of moving the anode downstream is effective in reducing the exposure of stunned fish during electrofishing because it promotes a more controlled and focused application of electrical currents. By directing the electrical field downstream, fish that are stunned are encouraged to move in a channel with reduced current exposure, allowing them to recover while minimizing the duration they are subjected to the electrical field. This method helps to maintain a consistent flow of fish into the area where they are captured while providing a quicker recovery for those that are not netted immediately.

In contrast, keeping the anode submerged at all times may not necessarily facilitate a movement pattern that benefits the stunned fish, as they might remain in the high-intensity area longer than needed. Turning off the power frequently disrupts the flow of the operation and can lead to increased stress or injury among fish, as they might not recover effectively in the intervals of power downtime. Using low voltage settings can be beneficial for reducing mortality, but it might not specifically address the issue of exposure time for stunned fish. Moving the anode downstream is the most strategic approach to ensure that fish have the opportunity to recover while maintaining efficiency in the electrofishing process.