Commercial fishing today uses a variety of techniques for fishing. Fishing rods with baited hooks and fishing lines used in various ways are used for fishing for some particular types of fish. Fishing using nets like cast nets, hand nets, drift nets, gillnets, seine nets, trawl nets, surrounding nets etc. of various sizes and construction as well as longline fishing with hundreds of hooks on a line fishing both for bottom and pelagic fish (near surface fish) are the most common devices used to catch high yields of fish. The crab fisheries uses crab pots baited with dead fish to catch crabs.