California’s waters, a death trap: Uncovering the Golden State’s secret whale and dolphin massacre.
Until the 1980s, fishermen who fished for swordfish off the coast of California used harpoon guns to reel in their prey. As the industry modernized, the guns were exchanged for drift gillnets — gigantic nets the size of the Golden Gate Bridge that hang vertically in the water.
http://www.salon.com/2016/09/03/californias-waters-a-de_partner/