A marlin caught as bycatch by the California drift gillnet fishery. The conservation group Oceana called the fishery one of the "dirtiest" in the U.S. because of its high rate of discarded fish and other marine animals. Courtesy of NOAA hide caption

itoggle caption Courtesy of NOAA

A fishmonger tosses a just-purchased fresh salmon to a colleague behind the counter at the Pike Place Fish Market in Seattle. Elaine Thompson/AP hide caption

itoggle caption Elaine Thompson/AP