This is a way of fishing that ruins and destroys the ocean floor. Huge sea nets are thrown from a ship into the sea, (which have huge and heavy steel balls attached to them, letting the net sink to the bottom of the sea). The nets are then dragged by the ship against the ocean floor, ripping and pulling up everything in there. Most of the time, most living creatures brought up are not even needed and are thrown back into the sea, dead. Underwater forests are destroyed everywhere in this way. These nets are called trawler nets and the fishing process is called Trawling.