A converted ferryboat is used in the Potomac River by the Virginia Institute ofMarine Science to test the efficiency of a midwater trawl in catching alewivesas they migrate upstream to spawn.
12/13/2018 9:51:55 AM
Credit: NOAA Central Library Historical Fisheries Collection; P. 108 of Our Changing Fisheries 1970 Centenary NMFS centenary volume
Location: Virginia, Potomac River