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 toggle caption Courtesy of NOAA The Salt Why 500 Million U.S. Seafood Meals Get Dumped In The Sea March 21, 2014 Nine American fisheries together throw overboard as much as 340 million pounds of fish and other species they were not trying to catch, a report finds. Much of it is perfectly edible fish.