Fishing industry in Denmark for mackerel fish is also the same on one vessel. Additional sprat quota/sandeel quota may be purchased for Baltic Sea sprat and Norway pout fishing. The type of vessels forming the fishing fleets are; trawlers, gill netters and poundnets (50% in this category but with capacity of less than 5GT mostly gill netter); trawlers and purse seiners of 150 GT. A substantial part of the fleet operate under depths of 24 m. After a few prosperous years for Denmark's fishing industry, figures for 2012 were not so good with profits falling to some DKK 600 million from DKK 900 million
Longline fishing or along the sea floor (demersal longline) for groundfish such as halibut or cod. Longliners fishing for sablefish, also referred to as black cod, occasionally set gear on the sea floor at depths exceeding using relatively simple equipment. Longlines with traps attached rather than hooks can be used for crab fishing in deep waters. Longline fishing is prone to the incidental catching and killing of dolphins, seabirds, sea turtles, and sharks, but can be considerably more ecologically sustainable than some other commercially significant harvesting methods. Longline fishing is controversial in some areas because of bycatch, fish caught while seeking another