Describe the frequency of electrical pulses used for optimal fish capture.

The frequency of electrical pulses used for optimal fish capture is critical in ensuring effective stunning while minimizing harm. The range of 2-4 Hz is considered effective because it creates a balance between the need to elicit a response from the fish and the need to avoid causing mortality or serious injury.

At this frequency, the electrical field provides sufficient stimulation to the fish's nervous system, causing them to become immobilized without leading to lethal conditions. This is particularly important in practices where fish are collected for study or later release, as it allows for humane treatment and increases the chances of survival post-capture.

In contrast to higher frequencies, which could lead to more serious harm or stress to the fish, this range focuses on stunning fish safely. A frequency below 1 Hz could potentially be too low to affect the fish adequately, while frequencies higher than 4 Hz may increase the risk of causing injuries. Thus, the frequency setting of 2-4 Hz is scientifically supported for the humane and effective capture of fish during electrofishing activities.