Types of Salmon: How to Identify Every Salmon Species

Salmon are arguably the most iconic fish on the planet. They're born in freshwater streams, migrate thousands of miles to the open ocean, then navigate back to the exact river where they hatched to spawn and die. It's one of nature's most dramatic life cycles — and it produces some of the best eating and most exciting fishing on Earth.

But "salmon" covers a surprisingly diverse group of species, and telling them apart matters — whether you're a fly angler targeting specific runs, a seafood buyer evaluating quality, or just someone who pulled a silvery fish out of a river and wants to know what it is. This guide covers every major salmon species, with the visual ID tricks that actually work in the field.

The Two Families: Pacific vs Atlantic Salmon

Before diving into individual species, it helps to understand the big split. All salmon belong to the family Salmonidae, but they divide into two genera that behave very differently:

Pacific salmon (Oncorhynchus) — five main species, all native to the Pacific Rim. They spawn once and die (semelparous). This is the group that includes king, sockeye, coho, pink, and chum salmon.
Atlantic salmon (Salmo salar) — one species, native to the Atlantic. They can spawn multiple times (iteroparous). Most Atlantic salmon sold commercially is farm-raised.

This distinction matters because it affects everything from size and taste to fishing regulations and conservation status. Pacific salmon runs are the backbone of ecosystems from Alaska to California, while wild Atlantic salmon populations have been devastated by damming, pollution, and competition from farmed escapees.

Chinook Salmon / King Salmon (Oncorhynchus tshawytscha)

The king salmon earned its name honestly. Chinook are the largest of all Pacific salmon — the all-tackle world record is 97 pounds, and fish over 50 pounds are taken every year in Alaska. They're also widely considered the best-tasting salmon, with high fat content that makes the flesh rich, buttery, and deeply flavorful.

How to Identify Chinook Salmon

Black gums — this is the single most reliable field mark. Look inside the mouth: if the gum line along the lower jaw is black or very dark gray, it's a chinook. No other Pacific salmon has this feature consistently.
Black spots on both lobes of the tail — chinook have irregular black spots scattered across the entire tail fin (upper and lower lobes). Coho only have spots on the upper lobe.
Size — if it's over 30 pounds and it's a Pacific salmon, it's almost certainly a chinook. Adults typically run 20-50 pounds, though 10-15 pound "jacks" (early-returning males) are common.
Ocean coloration — bright silver sides with a dark blue-green back. During spawning, they darken to olive-brown or maroon, with males developing a hooked jaw (kype).

Chinook runs vary enormously by river system. Spring-run chinook in the Columbia River basin are some of the most prized (and most endangered) fish in the Pacific Northwest, while Alaska's Kenai River produces the monster kings that headline fishing lodge brochures.

Sockeye Salmon / Red Salmon (Oncorhynchus nerka)

Sockeye undergo the most dramatic visual transformation of any salmon species. In the ocean, they're sleek and silver — attractive but unremarkable. Once they enter freshwater to spawn, they turn a vivid, almost neon crimson red with a bright green head. It's one of the most striking color changes in the animal kingdom.

How to Identify Sockeye Salmon

No large black spots — this is the key separator from chinook and coho. Sockeye have clean, unspotted backs and tails. Tiny speckling may be present, but no prominent spots.
Bright red spawning color — unmistakable. No other salmon turns this shade of red. The green head combined with the red body is diagnostic.
Smaller size — adults typically run 5-8 pounds, occasionally up to 12. They're noticeably smaller than chinook or chum.
Large, prominent eyes — relative to head size, sockeye have larger eyes than other Pacific salmon. The name "sockeye" likely derives from the Halkomelem word "suk-kegh," meaning "red fish."
Gill rakers — sockeye have 28-40 long, closely spaced gill rakers, more than any other Pacific salmon. This is because they feed heavily on zooplankton, unlike the more piscivorous chinook and coho.

Sockeye are the commercial powerhouse of the salmon world. Bristol Bay, Alaska, produces the largest wild sockeye runs on earth — some years exceeding 60 million fish. The flesh is deep red, firm, and intensely flavored, making it the preferred species for canning and high-end restaurants alike.

Coho Salmon / Silver Salmon (Oncorhynchus kisutch)

Coho are the sport fisher's salmon. They're aggressive, acrobatic, and more widely available than chinook in many coastal rivers. They're also the salmon most commonly confused with chinook by beginners, since both species are silver in the ocean and develop spots. But there are reliable ways to tell them apart.

How to Identify Coho Salmon

White gums — the inverse of chinook's black gums. Check the lower jaw: if the gum line is white or light gray, it's a coho. This is the fastest field test.
Spots only on the upper tail lobe — coho have small black spots on their back and the upper lobe of the tail, but the lower lobe is clean. Chinook have spots on both lobes.
Size range — adults typically run 8-12 pounds, occasionally up to 20. They're the "mid-size" Pacific salmon.
Spawning colors — males turn dark maroon-red on the sides with a dark green back and head. They develop a pronounced kype, but not as extreme as chum salmon.

Coho are found from central California to Alaska and across to Russia, Japan, and Korea. They're heavily stocked throughout the Great Lakes, where they've created world-class sport fisheries that rival Pacific coast runs for excitement if not for spectacle.

Pink Salmon / Humpy (Oncorhynchus gorbuscha)

Pink salmon are the smallest and most abundant Pacific salmon species. They run on a strict two-year life cycle — odd years in some rivers, even years in others — which means the same river can produce enormous runs one year and almost nothing the next. When the pinks are running, they fill rivers bank to bank.

How to Identify Pink Salmon

Large oval spots on the tail — pink salmon have large, distinct oval black spots on both lobes of the tail. These spots are bigger and more oval-shaped than the irregular spots on chinook.
Small size — adults average 3-5 pounds, rarely exceeding 8. They're the smallest Pacific salmon by a significant margin.
The hump — spawning males develop a pronounced dorsal hump just behind the head, hence the nickname "humpy." No other salmon develops this extreme body shape change.
Very small scales — pinks have the smallest scales of any Pacific salmon, giving them a smoother feel.

Pink salmon get less respect than they deserve. While they're not the rich, fatty fish that chinook are, fresh-caught pinks in ocean condition are mild, tender, and excellent on the grill. The canned pink salmon that most Americans grew up eating comes from this species.

Chum Salmon / Dog Salmon (Oncorhynchus keta)

Chum salmon are the second-largest Pacific salmon after chinook, and they have the widest natural range of any Pacific salmon species — from Sacramento, California, all the way around the Pacific Rim to Korea and Japan (where they're called "sake" and are culturally significant). They're also the species that undergoes the most dramatic physical transformation during spawning.

How to Identify Chum Salmon

No distinct black spots — like sockeye, chum lack the prominent spots found on chinook, coho, and pinks. In ocean phase, they're clean silver.
Spawning "tiger stripes" — spawning chum develop bold vertical bars of purple-green and red-yellow on their sides, creating a striking tiger-stripe pattern unique among salmon.
Massive teeth — spawning males develop large, canine-like teeth that give them a menacing look and earned them the "dog salmon" nickname. The teeth are visible even with the mouth closed.
Size — adults typically run 8-15 pounds, with occasional fish exceeding 20. They're bulkier and deeper-bodied than coho.
Pupil shape — ocean-phase chum often show a faint, dusky tip on the tail and paired fins with white leading edges — a subtle but useful ID mark.

Chum are increasingly valued commercially. Their roe (ikura) is considered the finest of all salmon species in Japanese cuisine, commanding premium prices. The flesh is leaner than chinook or sockeye, making it popular for smoking and jerky.

Atlantic Salmon (Salmo salar)

Atlantic salmon are the odd ones out in the salmon world. They're not in the same genus as Pacific salmon, they can survive spawning and return to sea, and the vast majority of Atlantic salmon consumed globally comes from farms in Norway, Scotland, Chile, and Canada rather than wild fisheries.

How to Identify Atlantic Salmon

X-shaped spots — Atlantic salmon have distinctive spots that are often X-shaped or star-shaped, scattered along the lateral line above the midline. These differ from the round spots on Pacific species.
Fewer spots below the lateral line — Pacific salmon tend to have spots distributed more widely, while Atlantic salmon's spots concentrate on the upper body.
Forked tail without spots — the tail is more deeply forked than most Pacific species and typically lacks the black spotting seen in chinook and coho.
Size — wild adults average 8-12 pounds, though they can exceed 30 pounds in productive rivers like Norway's Alta. Farm-raised fish are typically harvested at 8-10 pounds.
Adipose fin — present in all salmon, but in farm-raised fish it's often clipped for identification purposes. A missing adipose fin on an Atlantic salmon likely means it's a farm escapee.

Wild Atlantic salmon fishing is legendary in rivers like the Miramichi (New Brunswick), the Restigouche (Quebec), and dozens of Norwegian and Scottish rivers. But wild populations are a fraction of their historical numbers, and most Atlantic salmon rivers now operate on strict catch-and-release. If you want to eat Atlantic salmon, you're almost certainly buying farmed fish — which is a different conversation entirely.

Quick ID Cheat Sheet: Pacific Salmon at a Glance

When you're standing on a riverbank or boat deck trying to figure out what you just caught, here's the fastest decision tree:

Check the gums: Black gums = chinook. White gums = coho.
Any spots on the tail? Spots on both lobes = chinook or pink. Spots on upper lobe only = coho. No spots = sockeye or chum.
How big is it? Over 20 lbs = almost certainly chinook. Under 5 lbs = probably pink.
Spawning colors: Bright red body with green head = sockeye. Tiger stripes with big teeth = chum. Dark maroon = coho or chinook.
Large oval tail spots + small body? Pink salmon.
No spots + vertical bars + fangs? Chum salmon.

Kokanee: The Landlocked Sockeye

Kokanee deserve a special mention because they confuse a lot of anglers. Kokanee are genetically identical to sockeye salmon, but they complete their entire life cycle in freshwater — never migrating to the ocean. They're found in lakes throughout the Pacific Northwest and have been stocked in reservoirs across the western US.

Kokanee are much smaller than ocean-run sockeye, typically 10-16 inches and rarely exceeding 3 pounds. But they turn the same brilliant red when spawning, and they taste remarkably good for their size — many anglers consider them the best-eating freshwater fish in the West. If you catch a small, silver, unspotted salmon-shaped fish in a mountain lake, it's almost certainly a kokanee.

Salmon vs Trout: What's the Difference?

This is a question that trips up even experienced anglers, and honestly, the answer is a bit unsatisfying: the line between "salmon" and "trout" is more cultural than biological. Rainbow trout and steelhead are the same species (Oncorhynchus mykiss) — the ocean-going form is called steelhead, the resident freshwater form is called rainbow trout. Atlantic salmon (Salmo salar) is more closely related to brown trout (Salmo trutta) than to any Pacific salmon.

In general, "salmon" refers to anadromous fish that migrate to the ocean and return to freshwater to spawn, while "trout" refers to freshwater-resident forms. But this is a naming convention, not a hard biological rule. If you're interested in trout identification specifically, check out our complete guide to trout species.

Conservation: Why Salmon Populations Are Declining

The story of wild salmon in the 21st century is largely one of decline. Pacific salmon populations have crashed in many river systems, particularly in the lower 48 states. Several runs of chinook, coho, and sockeye are listed under the Endangered Species Act, and some have been functionally extinct for decades.

The causes are well-documented: hydroelectric dams that block migration routes, habitat degradation from logging and development, warming water temperatures from climate change, and overfishing (both commercial and recreational). Ocean conditions are shifting too — changes in prey availability and competition from hatchery fish affect wild survival rates.

Knowing how to identify salmon species isn't just an academic exercise — it's a conservation skill. Many fisheries have species-specific regulations. Keeping the wrong species or misidentifying a protected run can carry serious penalties. More importantly, anglers who can identify what they catch become better advocates for the rivers and fish they love.

Identify Any Salmon Instantly

Standing on a river bank with a silver fish on the line, trying to remember whether it's the gums or the tail spots that separate chinook from coho? We've been there. That's why we built the Fish Identifier app. Snap a photo of any salmon — ocean-bright or spawning-phase, whole fish or filet — and the AI identifies the species in seconds. It's faster than a cheat sheet, more reliable than asking the guy in the next drift boat, and it works offline so you can use it on remote rivers with no cell service.

Whether you're a seasoned angler, a marine biology student, or just someone who wants to know what kind of salmon is on their plate at dinner, understanding these species makes the fish — and the ecosystems they support — a lot more interesting.