What is a common indicator of effective electrofishing?

A high percentage of fish stun recovery after capture is considered a common indicator of effective electrofishing because it reflects the operator's ability to apply the proper techniques and settings that minimize stress and harm to the fish. When electrofishing is conducted effectively, fish can be temporarily stunned without suffering long-term injuries, allowing them to recover successfully once returned to the water.

If electrofishing is done too harshly or with inappropriate settings, it may result in high mortality rates or injuries to the fish. Therefore, monitoring the recovery rate helps ensure that the procedure is not only effective in capturing fish but also adheres to ethical standards and conservation practices, which prioritize the well-being of aquatic life.

Options involving low voltage usage, the diversity of captured species, or the speed of the operation do not directly indicate the effectiveness of the technique related to fish safety and recovery. While they may contribute to operational efficiency or other aspects of electrofishing, they do not serve as primary indicators of successful stun recovery, which directly ties to the welfare of the fish post-capture.