"The ocean floor left behind is a desert. Any fish swimming in the vast area of these nets is caught. The only control is mesh size. Fish that are smaller than the holes in the net can escape. While mandating minimum mesh sizes has become a favorite tool of regulators, fisherman often point out that once the back wall of the cod end has a good crop of fish in it, few fish of any size can escape, regardless of how big the mesh. Millions of unwanted fish—undesirable species, fish that are undersized or over quota, even fish with a low market price that week—are tossed overboard, usually dead."