Atlantic wolffish

What it is

This marine fish belongs to the wolffish family and lives in the North Atlantic. Its body is long and smooth, lacking pelvic fins, with scales hidden in the skin. Colours range from purplish-brown to blueish gray. The most striking feature is its dentition. Strong conical teeth sit at the front of both jaws, backed by rows of molars for crushing. This structure allows it to break hard shells. The fish moves slowly, undulating like an eel through the water.

Where it lives

Populations exist on both sides of the Atlantic Ocean. In the west, they inhabit waters from the Davis Strait down to Cape Cod, with dense groups in the Gulf of Maine. Rare sightings occur further south. On the eastern side, the range extends from Russian Arctic seas through Nordic regions and the British Isles to the Bay of Biscay. One record exists from the Mediterranean. They prefer cold environments, staying near the rocky seabed at depths between 20 and 500 metres.

How it lives

These benthic dwellers remain mostly stationary in rocky crevices or caves. They thrive in near-freezing saltwater thanks to natural antifreeze compounds in their blood. Their diet consists entirely of invertebrates with hard exteriors. They consume whelks, clams, hermit crabs, starfish, and sea urchins. By preying on green crabs and urchins, they help maintain balance in the marine ecosystem. They do not hunt other fish. Their presence often signals healthy conditions for other bottom-dwelling species.

Breeding and life cycle

Reproduction involves internal fertilization, which is unusual for many fish. The female produces large, yellow, opaque eggs that stick together in clumps on the seafloor. After laying, the male remains at the nest to guard the brood. He protects the developing young for up to four months until they are independent. This extended parental care is a key trait. The fish reach sexual maturity relatively late, typically at six years of age.

Fish and people

Fishermen in Britain market this species as Scotch halibut or woof. It is used in traditional dishes like fish and chips. In Iceland and Norway, locals call it stone biter due to its powerful jaws. US landings have dropped significantly since the 1980s peak. The National Marine Fisheries Service lists it as a Species of Concern. Conservation groups have petitioned for legal protection under the Endangered Species Act, citing habitat loss and bycatch, but federal agencies have not listed it.

Status and threats

Data from US fisheries show a sharp decline in catches over recent decades. Landings fell from over 1,200 tonnes in 1983 to under 65 tonnes by 2007. This reduction is attributed to overfishing and accidental capture in other nets. While not federally listed in the US, the population in the Baltic Sea is classified as endangered. Ongoing reviews examine whether stricter protections are needed for northwest Atlantic stocks.

Relatives and look-alikes

Three related species live in the north Atlantic: the northern, spotted, and Atlantic wolffish. The northern variant has gelatinous flesh, while the others are valued for food. The Pacific wolf eel is a distant relative with a similar common name but different taxonomy. The Atlantic wolffish is the type species for its genus, distinguished by its specific tooth arrangement.

Questions people ask about Atlantic wolffish

Good reading and sources

• Atlantic wolffish on WikipediaEncyclopedia
• More photos on Wikimedia CommonsPhotos
• Wikidata recordOpen data