Crabs, kejsarhummer, (Nephrops norvegicus) is a close relative of the common lobster but it is much smaller and more slender with long, narrow jaws. Unlike its larger relative lives on soft bottoms of clay and sand from Iceland and North Cape to Morocco and enters the Mediterranean Sea and the Skagerrak and the Kattegat, typically of 30-40 meters of depth, but can be found in depths of up to 400 meters.

Used in the tradition instead of fresh water, especially on the West Coast crab. Crayfish have a milder taste compared with several other less prawns. Fishing at times via burfiske.Males can reach a length of 25 cm, females 17 cm. Females become sexually mature at 8-10 centimeters in length.