Largest tributaries
Acipenseriformes - Sturgeons and Paddlefish
Syngnathiformes - Pipefishes and Seahorses
Anguilliformes - Eels and morays
Salmoniformes - Salmons and Trouts
Moroniformes - Temperate basses
Mugiliformes - Mullets
Clupeiformes - Herrings
Perciformes - Perches
Spariformes - Breams and porgies
Beloniformes - Needlefishes
Labriformes - Wrasses
Scombriformes - Mackerels
Scorpaeniformes - Mail-cheeked fishes
Gadiformes - Cods
Mulliformes - Goatfishes
Gobiiformes - Gobies
Carangiformes - Jacks
Pleuronectiformes - Flatfishes
Trachiniformes - Weeverfishes
Aulopiformes - Grinners
Blenniiformes - Blennies
Lamniformes - Mackerel sharks
Carcharhiniformes - Ground sharks
Torpediniformes - Electric rays
Rajiformes - Skates and rays
Orectolobiformes - Carpet shark
Osmeriformes - Smelts
Chimaeriformes - Chimaeras
Squatiniformes - Angelsharks
Hexanchiformes - Six-gill sharks
Rhinopristiformes - Shovelnose rays
Myxiniformes - Hagfishes
Myliobatiformes - Stingrays
Zeiformes - Dories
Tetraodontiformes - Puffers and filefishes
Dactylopteriformes - Flying gurnards
Lampriformes - Lamprids
Squaliformes - Sleeper and dogfish sharks
Lophiiformes - Anglerfishes
Acanthuriformes - Surgeonfishes
Cyprinodontiformes - Toothcarps
Notacanthiformes - Spiny eels
Saccopharyngiformes - Swallowers and Gulpers
Argentiniformes - Marine smelts
Myctophiformes - Lanternfishes
Beryciformes - Sawbellies
Ophidiiformes - Cusk-eels
Acropomatiformes - Oceanic basses
Atheriniformes - Silversides
Callionymiformes - Dragonets
Gasterosteiformes - Sticklebacks
The Kattegat is a 30,000 km2 (12,000 sq mi) sea area bounded by the Jutlandic peninsula in the west, the Danish Straits islands of Denmark and the Baltic Sea to the south and the provinces of Bohuslän, Västergötland, Halland and Skåne in Sweden in the east. The Baltic Sea drains into the Kattegat through the Danish Straits. The sea area is a continuation of the Skagerrak and may be seen as a bay of the North Sea, but in traditional Scandinavian usage, this is not the case.
The Kattegat is a rather shallow sea and can be very difficult and dangerous to navigate because of the many sandy and stony reefs and tricky currents, which often shift. In modern times, artificial seabed channels have been dug, many reefs have been dredged by either sand pumping or stone fishing,[clarification needed] and a well-developed light signaling network has been installed, to safeguard the very heavy international traffic of this small sea.
There are several large cities and major ports in the Kattegat, including, in descending size, Gothenburg, Aarhus, Aalborg, Halmstad and Frederikshavn.
Major waterways that drain into the Kattegat are the rivers of Göta älv at Gothenburg, together with the Lagan, Nissan, Ätran and Viskan in the province of Halland on the Swedish side, and the river of Gudenå in Jutland, in Denmark.
