Lumpsucker

The lumpsucker (Cyclopterus lumpus), also called the lumpfish, is a distinctive, globular-bodied fish found in cold waters throughout the North Atlantic, from the eastern coast of North America to northern Europe and the Arctic. Its rounded, almost balloon-like body and rough, bony-plated skin give it an unmistakable profile among northern marine fish. A modified pelvic fin forms a strong sucker disc on its underside, allowing it to attach firmly to rocks, kelp, and other surfaces. Females grow considerably larger than males and spend much of the year in deeper offshore water, while smaller males typically guard nests in shallower coastal habitat. The species is widespread and not currently considered at conservation risk.

Lumpsuckers are among the most easily recognized North Atlantic fish due to their rounded shape.

• Body: globular, laterally compressed, almost tear-drop shaped, lacking typical scales
• Skin: thick, rough, with rows of bony tubercles along the back and sides
• Coloration: variable, ranging from blue-grey and olive to bright orange or reddish, especially in breeding males
• Fins: small, and a distinctive sucker disc formed from fused pelvic fins on the belly
• Size: females up to 50-60 cm, males notably smaller at around 20-30 cm

Its unmistakable rounded body and ventral suction disc separate it from all other North Atlantic fish species.

Lumpsuckers range throughout cold North Atlantic waters, including the Arctic, from eastern Canada and Greenland to northern Europe, the North Sea, and south to the Bay of Biscay. Adult females typically spend much of the year in open, offshore water at depths of several hundred meters, while males and spawning females move into shallow, rocky coastal habitats and kelp beds to breed. Juveniles are often pelagic, drifting near floating seaweed before settling into nearshore rocky habitat. The species tolerates a wide depth range, from shallow tide pools during breeding season to deeper continental shelf waters the rest of the year.

Lumpsuckers use their ventral sucker disc to anchor firmly to rocks, kelp, or other substrates, conserving energy in areas with strong currents or surge. During the breeding season, males move into shallow coastal waters to guard nests of eggs laid by females among rocks and vegetation, fanning and defending them until hatching, an unusual degree of parental care among marine fish. Outside the breeding period, adult females largely disperse into deeper offshore waters and lead a more solitary existence. Lumpsuckers feed on small invertebrates, jellyfish, and crustaceans. Their eggs and juveniles are an important food source for a range of coastal predators.