From Wikipedia- Lumpfish or Lumpsuckers-
Lumpsuckers or lumpfish are mostly small scorpaeniform marine fish of the family Cyclopteridae. They are found in the cold waters of the Arctic, North Atlantic, and North Pacific oceans. The greatest number of species are found in the North Pacific.
The roe of Cyclopterus lumpus, known as the stenbider (literally "stone biter") in Danish or stenbit in Swedish, is used extensively in Scandinavian cuisine. The roe is also used as an affordable alternative to the caviar produced by sturgeons.
The family name Cyclopteridae derives from the Greek words κύκλος (kyklos), meaning "circle", and πτέρυξ (pteryx), meaning "wing" or "fin", in reference to the circle-shaped pectoral fins of most of the fish that comprise this family.