Atlantic spiny lumpsucker, Eumicrotremus spinosus
Atlantic Spiny Lumpsucker, Eumicrotremus spinosus

The Atlantic spiny lumpsucker is a strange looking, olive-brown fish that has no scales, but is instead covered in cone-shaped tubercles. Although this is perhaps the most common member of the lumpsucker family in the Arctic, little is known of its biology.

The Atlantic spiny lumpsucker has a short, stout body that is thickest just before the dorsal fin and tapers significantly to the caudal peduncle. It has a large head with a rounded snout, small mouth and thick "fish lips". Like other members of the lumpfish family, the Atlantic spiny lumpsucker's pelvic fins are modified into an adhesive disc. The pectoral fin gives the appearance that the fish is wearing a collar.

The Atlantic spiny lumpsucker occurs across the Canadian Arctic to Greenland, from Hudson Bay, south along the coast of Labrador to the Grand Banks, the Gulf of St. Lawrence and off Nova Scotia. This is a bottom-dwelling species, preferring mud, gravel or rocky bottoms, and is ordinarily found at depths between 5 and 82 metres.

Studies of stomach contents indicate that amphipods (shrimp-like crustaceans) are the only prey of this fish.