Pacific Halibut Identification Guide
Recognize Pacific halibut by its massive size, right-eyed diamond-shaped body, and nearly straight lateral line.
Read the full Pacific Halibut encyclopedia entry →
Key identification features
- Right-eyed, large, elongated diamond-shaped body
- Dark brown to olive-grey mottled upper side that blends closely with the seabed; pure white underside
- Lateral line runs nearly straight, with only a slight curve above the pectoral fin
- Very large mouth with sharp teeth, jaw reaching to below the eye
- Firm, thick-bodied build capable of reaching over 2 m and hundreds of kilograms
- Slightly forked tail fin
Common look-alikes
- Atlantic halibut – separated mainly by range, with a marginally more curved lateral line above the pectoral fin.
- Arrowtooth flounder – much thinner-bodied, softer flesh, and smaller, more delicate teeth than the robust-jawed Pacific halibut.
- Greenland turbot – smaller mouth and a more slender, less diamond-shaped body.
Where you'll see one
Pacific halibut inhabit cold waters of the North Pacific from California north through Alaska and across to Russia and Japan. They occupy continental shelf and slope habitats from shallow inshore areas down to over 1,000 m, generally favoring sandy or muddy bottoms.
Frequently asked questions
How can I tell Pacific halibut from arrowtooth flounder, which shares its range?
Pacific halibut has a much thicker, firmer body and a heavier jaw, while arrowtooth flounder is noticeably thinner-bodied with a softer texture and smaller teeth.
Is body size alone enough to identify a Pacific halibut?
Large size is a strong clue since Pacific halibut can dwarf most other North Pacific flatfish, but confirming the right-eyed orientation and diamond body shape gives a more reliable identification.