Toothed cod, Arctogadus borisovi.
Toothed Cod, Arctogadus borisovi

This species is distinguished from other cod in the Arctic by its slightly protruding lower jaw, forked caudal fin, discontinuous lateral line, and strong teeth in the front of its upper jaw. It is separated from its close relative, the polar cod, by its chin barbel, whose length is greater than the diameter of the cod's eye. Its dorsal fin is split into three triangular parts, the first consisting of 9–14 rays, the second, 6–23 rays, and the third, 19–25 rays. The anal fin is separated into two fins that are similar in size and shape, while the pelvic fin is long and trails below the belly. The toothed cod grows to a length of 60 cm. Their flanks and back are dark olive and the lower flanks and belly are light grey with dark spots.

The toothed cod occurs off northern Baffin Island west to the Beaufort and Kara seas and is also found off the northern and southern coasts of Greenland. It prefers living close to the sea floor at depths of 17 to 40 m, but it sometimes enters estuaries.

Analysis of stomach contents has revealed that the toothed cod feed largely on amphipods, but their biology is still poorly understood. They are of little economic value.