Which type of fishing involves the use of large nets dragged along the sea floor to catch demersal fish?

Trawling involves pulling a large cone-shaped net (trawl net) along the sea bottom to catch bottom-dwelling (demersal) fish such as cod and haddock. Drift nets float near the surface, purse seines encircle schools of pelagic fish, and long-lining uses baited hooks on a long line.