Arctic char is one of the healthiest fish you can eat. It delivers roughly 16 to 19 grams of protein per serving, carries about 128 calories per 100 grams of raw fillet, and contains some of the lowest mercury levels of any freshwater or cold-water fish. If you’re looking for a nutrient-dense protein source that’s also environmentally responsible, arctic char checks nearly every box.
Calories, Protein, and Fat
A 100-gram serving of raw arctic char provides about 128 calories, 16 grams of protein, and 7 grams of fat. Once cooked, protein concentrates slightly as water evaporates, bringing the count closer to 19 grams per serving. That protein-to-calorie ratio is comparable to salmon, making char a solid choice for anyone focused on building or maintaining muscle.
The fat in arctic char is predominantly unsaturated, including a meaningful amount of omega-3 fatty acids. Omega-3s support heart health by helping reduce inflammation, lower triglycerides, and maintain healthy blood pressure. The fat content sits between that of lean white fish like cod and fattier options like farmed Atlantic salmon, which gives char a mild, rich flavor without the heavier calorie load of the fattiest fish.
Omega-3s Without the Heavy Mercury
Mercury is the main safety concern people have with seafood, and this is where arctic char really stands out. Alaska’s Department of Environmental Conservation measured mercury in arctic char fillets at an average of just 0.068 parts per million, with a maximum of 0.25 ppm across 30 samples. For context, the FDA’s action level for mercury in commercial fish is 1.0 ppm, and many popular fish sit well above char’s numbers. Swordfish, king mackerel, and bigeye tuna commonly test between 0.5 and 1.5 ppm.
Arctic char’s low mercury is partly explained by its habitat and diet. These fish live in cold, remote Arctic and subarctic waters where industrial pollution is minimal. They also tend to occupy a lower position on the food chain than large predatory species, so they accumulate less mercury over their lifetimes. This makes char a particularly good option for pregnant women, children, and anyone who eats fish several times a week and wants to keep mercury exposure low.
Key Vitamins and Minerals
Like other cold-water fish, arctic char is a natural source of several nutrients that many people don’t get enough of. It provides vitamin D, which is difficult to obtain from food alone and plays a critical role in bone health and immune function. It also supplies vitamin B12, essential for nerve function and red blood cell production. A single serving of char can deliver a significant portion of your daily needs for both.
Char also contains phosphorus, which works alongside calcium to maintain bone density, and selenium, a trace mineral that supports thyroid function and acts as an antioxidant. The combination of these micronutrients with high-quality protein and omega-3 fats is what makes fish like char more nutritionally complete than many other protein sources.
How It Compares to Salmon
Arctic char is the closest living relative of both salmon and trout, and the comparison to salmon is the one most people want. Nutritionally, the two are similar. Both offer generous protein, omega-3 fatty acids, and a comparable vitamin and mineral profile. The main differences come down to fat content and flavor.
Farmed Atlantic salmon is generally fattier, often containing 10 to 13 grams of fat per 100 grams compared to char’s 7 grams. That extra fat means more total omega-3s per serving, but also more calories. If you’re choosing between the two, char gives you a leaner option with a milder, slightly sweeter taste that works well for people who find salmon too strong. Wild sockeye salmon is leaner and closer to char’s profile, though it typically costs more and has a more intense flavor.
On mercury, char has a clear edge. Its average of 0.068 ppm is lower than most reported values for both farmed and wild salmon species, though salmon is already considered a low-mercury fish. If minimizing mercury is your top priority, char is one of the safest choices available.
Sustainability Matters Too
Health isn’t just about what’s in the fish. Whether a species is farmed responsibly affects its long-term availability and environmental impact. Monterey Bay Aquarium’s Seafood Watch program rates farmed arctic char raised in indoor recirculating tanks with wastewater treatment as a “Best Choice,” their highest sustainability rating. These closed-system farms prevent waste from entering waterways and don’t risk spreading disease or parasites to wild fish populations.
Not all farmed char earns that top rating. Operations that skip proper wastewater treatment receive a yellow “Good Alternative” rating instead. If sustainability matters to you, look for char labeled as raised in recirculating aquaculture systems, sometimes abbreviated RAS on packaging or menus.
Simple Ways to Prepare It
Arctic char’s moderate fat content makes it forgiving to cook. It stays moist under high heat and doesn’t dry out as quickly as leaner fish like tilapia or cod. Pan-searing skin-side down in a hot skillet for 3 to 4 minutes, then flipping briefly, produces crispy skin and a tender interior. Roasting at 400°F for about 12 minutes works just as well with minimal effort.
Because char has a delicate, slightly sweet flavor, it pairs well with simple seasonings: olive oil, lemon, salt, and fresh herbs. Heavy sauces or strong marinades tend to overpower it. The flesh cooks to a pink-orange color similar to salmon, making it an easy visual substitute in any recipe that calls for salmon or trout.