Operations in the field

Sampling techniques such as “block and shock” are demonstrated, where fish are guided into nets by shocking upstream. The crew targets small-bodied fish like mottled sculpin and speckled dace, while non-target species such as crayfish are released. Adjustments to voltage and current are made based on fish response, and nets with appropriate mesh size are recommended depending on the target species. The video also notes challenges, such as reduced efficiency in deeper water, the importance of maintaining upright posture to avoid triggering the tilt switch, and the need to minimize sediment disturbance to preserve visibility.