Lumpfish, or Lumpsucker, a short thick-bodied fish found in cold water on both sides of the Atlantic. It is distinguished by lumpy wart-like growths that cover the skin. The pelvic fins are modified, forming a sucking disk on the underside of the body. This disk allows the fish to cling to rocks.

The fish is 9 to 12 inches (23 to 30 cm) long and weighs up to two pounds (900 g). Its color varies. The lumpfish is an important food fish in northern Europe.

The lumpfish is Cyclopterus lumpus of the lumpfish family, Cyclopteridae.