Environmental researchers visited Wolf Creek Park, off of Ohio 53 south of Fremont, to survey the diversity of fish species in the Sandusky River watershed. This helps researchers determine water quality based on the kinds of fish they find. If only pollution-tolerant species are present, they know the area has potential problems upstream.
To do the survey, researchers use an electrical probe --perhaps the reason the operation brings to mind alien activities -- to stun any fish in the vicinity. The fish float to the surface, where a person with a net scoops them up and puts them in a holding tank.