Coho salmon is one of the best fish you can eat. It delivers 21 grams of protein per 100-gram serving with only 146 calories and about 6 grams of fat, making it the leanest of the major Pacific salmon species. It’s low in mercury, rich in omega-3 fatty acids, and has a mild, approachable flavor that works well for people who find stronger fish off-putting.
How Coho Compares to Other Salmon
If you’ve stood at a fish counter wondering whether to grab coho, sockeye, or king salmon, the main differences come down to fat and calories. A cooked 3-ounce serving of coho has about 120 calories and 4 grams of fat. Sockeye comes in slightly higher at 130 calories and 5 grams of fat. King salmon is the richest of the three at 200 calories and 11 grams of fat per serving.
That leanness is a genuine advantage if you’re watching your calorie intake or prefer a lighter meal. King salmon’s high fat content gives it a buttery richness that many people love, but coho offers a middle ground: enough fat to keep the flesh moist and flavorful without the heaviness. All three species are excellent sources of omega-3s, selenium, and protein, so none is a bad choice. Coho just happens to be the most forgiving option for everyday cooking.
Nutritional Profile
A 100-gram raw portion of coho salmon provides 21.6 grams of protein, 5.9 grams of total fat (with only 1.3 grams of saturated fat), 45 milligrams of cholesterol, and zero carbohydrates. It also contains 36.5 micrograms of selenium, which is about two-thirds of the daily recommended intake for adults. Selenium supports thyroid function and acts as an antioxidant in your cells.
Like all wild salmon, coho contains astaxanthin, the pigment responsible for its orange-pink flesh. Astaxanthin is a powerful antioxidant that has been linked to protection against UV-induced skin damage and improved retinal function in people with age-related eye conditions. Wild Pacific salmon species vary in their astaxanthin content; sockeye has the highest concentration (26 to 38 mg per kilogram of flesh), with coho falling in the mid-range among Oncorhynchus species.
Heart Health Benefits
The omega-3 fatty acids in salmon, primarily EPA and DHA, are the main reason health organizations recommend eating fish regularly. The American Heart Association suggests two servings of fatty fish per week, with each serving being about 3 ounces cooked. Salmon is specifically named on their recommended list.
Regular omega-3 intake has a measurable effect on cardiovascular risk markers. Even relatively small amounts (under 2 grams per day) can significantly reduce post-meal triglyceride spikes, which are an independent risk factor for heart disease. Higher intakes, around 4 grams daily, have been shown to lower blood triglyceride levels by 25% to 30%. Omega-3s also produce a modest but consistent drop in blood pressure, particularly in people who already have elevated readings. In studies of untreated hypertensive patients consuming over 3 grams per day, blood pressure dropped by an average of 5.5/3.5 mm Hg. DHA appears to be more effective than EPA for this particular benefit.
Two servings of coho per week won’t deliver the high therapeutic doses used in clinical trials, but it contributes meaningfully to your baseline omega-3 intake and provides benefits that accumulate over time alongside other dietary choices.
Mercury and Safety
Salmon is one of the lowest-mercury fish available. Fresh and frozen salmon averages just 0.022 parts per million of mercury, according to FDA testing data collected over nearly two decades. Canned salmon is even lower at 0.014 ppm. For context, high-mercury fish like swordfish and shark typically measure above 0.9 ppm. Salmon’s mercury levels are so low that some samples registered as not detectable at all, and even the highest individual sample in the FDA dataset reached only 0.19 ppm.
This makes coho a safe choice for virtually everyone, including pregnant women and young children, who are the groups most sensitive to mercury exposure. You can comfortably eat it multiple times per week without approaching any meaningful risk threshold.
Flavor and Texture
Coho is often described as the most beginner-friendly salmon. NOAA Fisheries characterizes smaller coho as having a “delicate” flavor, while larger fillets taste “mild.” If you’ve been turned off by the strong, almost gamey flavor of sockeye, coho is worth trying. It has a cleaner, subtler taste that pairs well with simple seasonings.
The texture is interesting: coho appears soft when raw but firms up nicely during cooking, becoming flaky and tender. This makes it versatile in the kitchen. It holds together on a grill, bakes evenly, and pan-sears well. The moderate fat content means it’s less forgiving of overcooking than king salmon, but more forgiving than very lean fish like cod or tilapia.
How to Cook It Without Drying It Out
Because coho is leaner than king salmon, temperature control matters. Fish starts to dry out around 140°F internally, which is why many people who think they don’t like salmon have simply been eating overcooked salmon. For wild salmon like coho, aim for a final internal temperature of about 125°F for a medium-rare result that’s firm but still moist.
The trick is to pull the fish off the heat earlier than you think you should. Remove it from the pan, grill, or oven when your thermometer reads 115°F to 120°F, then let it rest. Residual heat will carry the temperature up to that 120°F to 125°F sweet spot over the next few minutes. If you prefer your salmon cooked through, you can push it toward 130°F, but going much beyond that with coho will leave you with a dry, chalky fillet.
When to Buy Fresh Coho
Wild coho salmon enter coastal streams from July through November, but the prime window for fresh availability is July through September. That’s when Alaskan runs peak and sport and commercial fisheries are most active. Alaska is the primary source for wild coho in the U.S., with fish found from the southeast panhandle all the way up to the Chukchi Sea coast. Coho also runs along the coast from British Columbia down to central California.
Outside of summer and early fall, frozen wild coho and canned salmon are your best options. Flash-frozen wild coho retains its nutritional profile and flavor well. If you’re buying at a fish counter during the off-season and something is labeled “fresh wild coho,” it’s worth asking whether it was previously frozen, which is common and perfectly fine.
Sustainability
Wild coho salmon is rated a “Good Alternative” by Monterey Bay Aquarium’s Seafood Watch program, meaning it’s a reasonable choice when a top-rated “Best Choice” option isn’t available. Specific ratings vary by region and fishing method. Coho caught with trolling lines off the west coast of Vancouver Island, for example, carries that yellow “Good Alternative” rating. If sustainability is a priority for you, look for coho from Alaska, where fisheries management is generally considered strong, and check for Marine Stewardship Council certification on packaging.