13 Halibut Species: From the World’s Largest Flatfish to Lesser-Known Relatives

Halibut are among the most fascinating flatfish on the planet — giants of the seafloor that have captured the attention of anglers, marine biologists, and seafood lovers alike. These remarkable fish spend their adult lives lying on the ocean bottom with both eyes on one side of their head, a striking adaptation that makes them instantly recognizable among the many types of fish found in the world’s oceans.

What most people don’t realize is that “halibut” isn’t just one fish. The name applies to a surprisingly diverse group of flatfish species spread across the North Atlantic, North Pacific, and beyond — ranging from record-breaking giants to small, rarely discussed relatives that live in deep, cold waters far from any fishing dock.

This guide covers all 13 types of halibut, exploring where each species lives, how large it grows, what makes it visually distinct, and why it matters — whether ecologically, commercially, or to the dedicated angler casting a line in search of a trophy catch.

1. Atlantic Halibut

The Atlantic halibut (Hippoglossus hippoglossus) holds the title of the largest flatfish in the world, and it’s a record that’s hard to dispute. Adults routinely exceed 200 pounds, and historical catches have pushed well past 700 pounds — extraordinary dimensions for a fish that begins life as a tiny, symmetrical larva drifting in open water.

Found across the North Atlantic from the Gulf of Maine to Iceland, Greenland, and the Barents Sea, Atlantic halibut prefer cold, deep waters ranging from 160 to over 3,000 feet. They’re highly migratory, moving seasonally between feeding and spawning grounds. Their upper side is a dark olive-brown to slate gray, providing excellent camouflage against sandy or muddy seafloors, while the underside is a clean, pale white.

Despite their size and commercial appeal, Atlantic halibut populations have suffered significantly from overfishing. They are currently listed as endangered by the IUCN, and strict catch limits are in place across much of their range. Aquaculture operations in Norway and Canada have stepped in to meet market demand, producing farmed Atlantic halibut that now appear regularly in high-end restaurants.

Key Insight: Atlantic halibut are the longest-lived flatfish species, with some individuals reaching 50 years of age. Their slow growth rate makes population recovery from overfishing an exceptionally long process.

For anglers, catching a wild Atlantic halibut is considered a bucket-list achievement. The right fishing approach matters enormously — these fish require heavy tackle, deep-water rigs, and significant patience.

2. Pacific Halibut

The Pacific halibut (Hippoglossus stenolepis) is the most commercially important halibut species in the world and the one most anglers picture when they hear the word “halibut.” It ranges across the North Pacific from California to Japan, with the largest concentrations found in the Gulf of Alaska and the Bering Sea.

Pacific halibut are slightly smaller on average than their Atlantic cousins but are still impressively large fish. Females, which grow considerably larger than males, can exceed 500 pounds, though most commercially caught individuals weigh between 20 and 100 pounds. Their coloring closely mirrors the Atlantic halibut — dark brown to olive on top, white underneath — making the two species visually similar despite occupying entirely different ocean basins.

Pro Tip: When comparing Pacific halibut vs Atlantic halibut, one reliable field distinction is scale size. Pacific halibut have smaller, smoother scales relative to body size, while Atlantic halibut tend to have slightly rougher skin texture.

The Pacific halibut fishery is one of the most carefully managed in the world, overseen by the International Pacific Halibut Commission since 1923. Annual catch limits, gear restrictions, and seasonal closures have helped maintain relatively healthy population levels — a conservation success story in a world where many large fish species are in decline.

From a culinary standpoint, Pacific halibut is prized for its firm, white, mild-flavored flesh. It’s a staple of Alaskan cuisine and a favorite target for sport fishermen using specialized heavy rods capable of handling the fight a large halibut puts up. Matching the right fishing reel to the rod is equally important when targeting these powerful bottom-dwellers.

3. Greenland Halibut

The Greenland halibut (Reinhardtius hippoglossoides) occupies a fascinating middle ground in the flatfish world. Unlike true halibut in the genus Hippoglossus, it belongs to its own genus and displays some unusual anatomical quirks — most notably, its “bottom” eye has migrated far enough up the head that it sits nearly at the top of the skull, giving it better upward vision than most flatfish. This adaptation suggests it spends more time swimming mid-water than lying flat on the seafloor.

Greenland halibut are found on both sides of the North Atlantic and North Pacific, preferring extremely cold, deep water — often between 1,600 and 6,500 feet. Their range includes Greenland, Iceland, Norway, Canada, and the Bering Sea. They’re a darker fish overall, with a brownish-gray coloration on both sides rather than the stark white underside seen in true halibut.

Commercially, Greenland halibut are sold under several names including “Greenland turbot” and “black halibut,” which can cause confusion at fish markets. They’re particularly popular in Japan and Scandinavia, where they’re often smoked or served as sashimi. Their high fat content gives them a richer flavor profile compared to Atlantic or Pacific halibut.

Important Note: Greenland halibut are sometimes mislabeled as “turbot” in commercial markets, which is technically inaccurate. True turbot (Scophthalmus maximus) is a different species entirely, native to European coastal waters.

4. California Halibut

The California halibut (Paralichthys californicus) is a beloved sport fish along the U.S. West Coast, found from the Quillayute River in Washington State south to Magdalena Bay in Baja California, Mexico. Unlike the massive true halibut species, California halibut are a more modest size — most adults weigh between 6 and 30 pounds, though fish exceeding 70 pounds have been recorded.

One of the most interesting things about the California halibut species is its unusual eye placement flexibility. While most flatfish are either “left-eyed” (eyes on the left side) or “right-eyed,” California halibut can be either — roughly 40% are left-eyed and 60% are right-eyed, a rare ambidextrous trait among flatfish.

California halibut favor sandy-bottom shallows, bays, and estuaries, making them far more accessible to shore-based and nearshore anglers than deep-water halibut species. They’re aggressive, fast-moving predators that feed heavily on anchovies and other small fish, which means lure fishing and live bait both work well. Using the appropriate fishing rig setup for sandy-bottom environments significantly improves catch rates.

Pro Tip: California halibut are most active during incoming tides in shallow bays. Targeting sandy flats near channel edges during these windows produces the best results for both lure and live bait anglers.

From a conservation standpoint, California halibut populations are considered relatively stable, though habitat loss in estuaries — critical nursery areas for juveniles — remains an ongoing concern for fisheries managers.

5. Japanese Halibut

The Japanese halibut (Paralichthys olivaceus), known in Japan as “hirame,” is one of the most culturally significant flatfish in East Asian cuisine. It ranges from Japan and Korea through the Yellow Sea to the coast of China, preferring sandy and muddy bottoms in relatively shallow coastal waters.

Japanese halibut typically reach 24 to 35 inches in length, with larger individuals occasionally exceeding 40 inches. Their coloration is a mottled brownish-gray on the upper side, sometimes with faint spots, and white on the underside. The species is left-eyed, meaning both eyes appear on the left side of the body when the fish is viewed from above.

In Japan, hirame is considered a premium sashimi fish — its delicate, slightly sweet flesh is a hallmark of high-end Japanese cuisine, often served during special occasions and celebrations. This cultural demand has driven an enormous aquaculture industry; Japan produces hundreds of thousands of tons of farmed Japanese halibut annually, making it one of the most extensively farmed flatfish species in the world.

Key Insight: Japanese halibut aquaculture is so advanced that researchers have developed techniques to control skin pigmentation in farmed fish, addressing the common aquaculture problem of albino or mottled undersides that reduce market appeal.

6. Bastard Halibut

Despite its colorful common name, the bastard halibut (Paralichthys dentatus) — more commonly known as the summer flounder along the U.S. East Coast — is a genuinely impressive sport and commercial fish. It ranges from Maine to South Carolina, with the highest concentrations found between New York and North Carolina during summer months.

Summer flounder are left-eyed flatfish that grow to about 26 to 37 inches on average, with large females occasionally reaching 26 pounds. Their upper side displays a highly variable pattern of spots and ocellated markings — dark circles with lighter centers — that they can rapidly adjust for camouflage. This color-changing ability is among the most sophisticated of any flatfish species.

The summer flounder is a prized recreational target along the Mid-Atlantic coast, supporting a significant charter boat industry. Anglers pursue them using appropriate fishing lines matched to the depth and current conditions, often drifting bucktail jigs or squid strips across sandy bottoms. The species is also commercially important, appearing regularly in East Coast fish markets and restaurants under the name “summer flounder” or simply “flounder.”

7. Florida Halibut

The Florida halibut (Paralichthys albigutta), also known as the Gulf flounder, is a smaller member of the Paralichthys family found in the Gulf of Mexico and along the southeastern Atlantic coast of the United States. Its range extends from North Carolina around Florida and throughout the Gulf, with particularly dense populations in shallow coastal bays, grass flats, and estuaries.

Gulf flounder are modest in size compared to their larger relatives, typically reaching 12 to 18 inches and weighing between 1 and 3 pounds, though occasional individuals push past 5 pounds. Their coloration is a brownish-tan with three distinctive ocellated spots arranged in a triangular pattern — a reliable identification marker that sets them apart from other flounder species sharing their range.

These fish are shallow-water specialists, often found in water less than 10 feet deep. They’re popular targets for wading anglers and gigging enthusiasts, particularly in Florida and along the Gulf Coast. The species is closely related to the southern flounder (Paralichthys lethostigma), and the two are frequently confused by anglers fishing the same waters.

Important Note: Florida halibut (Gulf flounder) and southern flounder often share the same habitat. The three distinctive triangular spots on the Gulf flounder’s body are the clearest way to tell the two species apart in the field.

8. Spotted Halibut

The spotted halibut (Verasper variegatus) is a striking flatfish found in the coastal waters of Japan, Korea, and China. It belongs to the genus Verasper, which separates it taxonomically from both the true halibut (Hippoglossus) and the Paralichthys group, making it a more distant relative within the broader flatfish family.

Spotted halibut are easily identified by the bold, irregular orange or reddish-brown spots scattered across their upper body — a pattern unlike any other halibut species and one of the most visually distinctive markings in the flatfish world. Adults typically reach 18 to 24 inches in length, making them a medium-sized species by halibut standards.

They inhabit sandy and muddy coastal bottoms, typically in waters shallower than 300 feet. In Japan, spotted halibut have attracted aquaculture interest due to their attractive appearance and the premium prices their flesh commands at market. Research into their breeding biology and larval rearing techniques has been ongoing for several decades, with commercial-scale production now established at select facilities.

9. Barfin Flounder

The barfin flounder (Verasper moseri) shares its genus with the spotted halibut and is found in the cold waters of the northwestern Pacific, primarily around Japan, the Sea of Japan, and the Sea of Okhotsk. It’s a deeper-water species than its spotted cousin, typically found at depths between 300 and 1,500 feet on soft, muddy bottoms.

Barfin flounder are distinguished by their notably high dorsal and anal fins — the “barfin” name refers to this prominent fin structure — which give them a taller, more compressed body profile compared to most flatfish. Their coloration is a uniform brownish-gray on the upper side, lacking the bold spots of Verasper variegatus. Adults generally reach 12 to 20 inches in length.

This species has been the subject of significant aquaculture research in Japan, driven by interest in diversifying flatfish farming beyond the dominant Japanese halibut (Paralichthys olivaceus). Barfin flounder grow more slowly than Japanese halibut but are adapted to colder water temperatures, making them a candidate for farming in regions where Japanese halibut culture is less viable.

Key Insight: Barfin flounder are one of several flatfish species being investigated for cold-water aquaculture in northern Japan, where winter sea temperatures drop too low for many warm-adapted species to thrive.

10. Shotted Halibut

The shotted halibut (Eopsetta grigorjewi), sometimes called the Grigorjew’s flounder, is a North Pacific species found from Japan and the Korean Peninsula northward through the Sea of Okhotsk and into the western Bering Sea. It occupies sandy and gravelly bottoms at moderate depths, generally between 100 and 1,200 feet.

Shotted halibut are right-eyed flatfish — both eyes appear on the right side of the body — which places them in a different anatomical camp from the left-eyed Paralichthys species. Their upper surface is a pale brownish color marked with small, scattered dark spots that give the species its “shotted” name, evoking the appearance of a surface peppered with fine shot.

Adults typically reach 16 to 28 inches in length. The shotted halibut is a commercially harvested species in Japan and Russia, where it appears in local fish markets and is used in both fresh and processed seafood products. It’s less well-known internationally than the major halibut species but remains an important component of regional North Pacific fisheries.

11. Roughscale Sole

The roughscale sole (Clidoderma asperrimum) is perhaps the most taxonomically distant member of this halibut overview — it belongs to its own genus and is technically classified as a sole rather than a halibut, though it shares ecological space and fishing relevance with the halibut group across its North Pacific range. It’s found from Japan and the Sea of Okhotsk eastward to the Gulf of Alaska and the Aleutian Islands.

The species gets its name from the notably rough, spiny scales covering its upper body — a texture that’s immediately apparent to the touch and serves as a reliable identification feature. Roughscale sole are right-eyed flatfish with a brownish-gray upper surface and pale underside. They typically reach 12 to 20 inches in length and inhabit muddy or sandy bottoms at depths ranging from 300 to over 2,000 feet.

Roughscale sole are caught incidentally in trawl fisheries targeting Pacific halibut, arrowtooth flounder, and other groundfish species in Alaskan waters. While not a primary target species, they contribute to bycatch totals and are occasionally retained for processing. Their deep-water habitat means they’re rarely encountered by recreational anglers, keeping them firmly in the category of commercially relevant but publicly obscure species.

Common Mistake: Roughscale sole are sometimes grouped loosely with “halibut” in bycatch reports and regional fisheries data, which can create confusion about true halibut population statistics. They are a distinct species with separate management considerations.

12. Arrowtooth Halibut

The arrowtooth halibut (Atheresthes stomias), also known as the arrowtooth flounder, is one of the most abundant flatfish in the North Pacific, found from California north to the Bering Sea and westward to the Aleutian Islands. Despite this abundance, it remains far less celebrated than Pacific halibut — largely because its flesh softens rapidly after death due to a naturally occurring enzyme, making it difficult to market fresh.

Arrowtooth halibut are right-eyed flatfish with a distinctive large mouth filled with prominent, fang-like teeth — the source of the “arrowtooth” name. Their coloration is a uniform brownish-gray on the upper side with a white underside. Adults typically reach 24 to 33 inches, with large individuals occasionally exceeding 35 inches and 15 pounds.

Despite the texture challenge, arrowtooth halibut have attracted significant research interest as a potential commercial species. Processing techniques involving heat treatment or enzyme inhibitors have been developed to stabilize the flesh, and the species is now used in surimi (fish paste) production and other processed seafood products. From an ecological standpoint, arrowtooth halibut are voracious predators that compete directly with Pacific halibut for prey, and their population growth has been cited as a factor in Pacific halibut management discussions.

Pro Tip: If you catch an arrowtooth halibut, ice it immediately and process it quickly. The flesh-softening enzyme activates rapidly at warmer temperatures, so speed and cold are the keys to salvaging table-quality meat from this species.

Anglers targeting Pacific halibut in Alaska frequently encounter arrowtooth halibut as bycatch. Understanding the differences between the two species — including the arrowtooth’s larger mouth and fang-like dentition — helps with quick identification and proper handling. Using the right fishing techniques and tackle for deep-water flatfish can also help reduce unwanted bycatch encounters.

13. Kamchatka Halibut

The Kamchatka halibut (Atheresthes evermanni), sometimes called Kamchatka flounder or Evermann’s halibut, is the lesser-known sibling of the arrowtooth halibut. It shares the same genus and a broadly similar range, found in the North Pacific from Japan and the Sea of Okhotsk eastward through the Bering Sea and Aleutian Islands, though it tends to occupy slightly deeper water than its arrowtooth relative.

Distinguishing Kamchatka halibut from arrowtooth halibut in the field is genuinely challenging — both are right-eyed, large-mouthed flatfish with similar coloration and body shape. The most reliable distinguishing feature is the lateral line: Kamchatka halibut have a more pronounced arch in the lateral line above the pectoral fin compared to arrowtooth halibut, and their gill rakers tend to be fewer in number. Genetic analysis is often required for definitive identification.

Kamchatka halibut are caught incidentally in trawl fisheries throughout their range and are harvested commercially in Russian and Japanese waters. Like the arrowtooth halibut, they face the flesh-softening enzyme challenge that limits their appeal as fresh-market fish. They’re used primarily in processed seafood products and contribute to regional bycatch totals in Alaskan groundfish fisheries.

Despite their relative obscurity, Kamchatka halibut represent an important piece of the North Pacific flatfish puzzle. Understanding the full diversity of halibut-related species — from the enormous Atlantic halibut to these deep, cold-water relatives — gives a more complete picture of how flatfish have diversified across the world’s oceans. For anyone interested in exploring the broader world of fish diversity, the halibut group is a rewarding place to start.

Comparing All 13 Halibut Species at a Glance

What Makes Halibut Such Successful Flatfish?

Across all 13 species, a few shared traits explain why halibut and their close relatives have thrived in some of the world’s most demanding marine environments. Their flattened body plan — developed through a remarkable metamorphosis from a symmetrical larva — allows them to lie perfectly still on the seafloor, conserving energy while remaining nearly invisible to both predators and prey.

Their ambush hunting strategy is devastatingly effective. By remaining motionless against the bottom and then striking upward with explosive speed, halibut can catch fast-moving prey like herring, sand lance, and squid that would otherwise be impossible to pursue in open water. This predatory efficiency has made them apex predators in their respective ecosystems.

The diversity within the halibut group also reflects impressive ecological flexibility. True halibut in the genus Hippoglossus have conquered the deep, cold waters of the North Atlantic and North Pacific. Paralichthys species have colonized shallow coastal bays and estuaries on both coasts of North America and throughout East Asia. Verasper species occupy mid-depth coastal zones in the northwestern Pacific, while Atheresthes species dominate deep-water trawl fisheries across the Bering Sea and Gulf of Alaska.

Key Insight: The flatfish body plan has evolved independently multiple times in fish evolutionary history — a phenomenon called convergent evolution. The halibut group represents just one successful lineage within the much larger order Pleuronectiformes, which contains over 700 flatfish species worldwide.

For anyone drawn to the underwater world — whether as an angler, a diver, a seafood enthusiast, or simply a curious naturalist — the halibut group offers a window into the extraordinary variety that evolution can produce within a single ecological niche. From the record-breaking Atlantic halibut to the obscure Kamchatka flounder lurking in deep Bering Sea mud, these are fish that reward closer attention.

If this deep dive into halibut diversity has sparked a broader curiosity about marine life, exploring the many types of jellyfish found in the same ocean habitats offers another fascinating perspective on sea life, or check out the remarkable variety found among different types of tuna — another group of ocean giants with their own compelling story.