Salmon is not a lean meat by USDA standards. To earn the “lean” label, a meat must contain less than 10 grams of total fat per 100 grams. Most salmon species exceed or border that threshold, and in the world of fish, salmon is specifically classified as a “fatty fish,” a category it shares with mackerel, sardines, and herring. That said, the fat in salmon is a fundamentally different kind of fat than what you find in a marbled steak, and that distinction matters more than the label.
How the USDA Defines “Lean”
The USDA sets clear cutoffs for what can be labeled lean or extra lean. A lean meat must have less than 10 grams of total fat, no more than 4.5 grams of saturated fat, and less than 95 milligrams of cholesterol per 100 grams. Extra lean is stricter: less than 5 grams of total fat and under 2 grams of saturated fat per 100 grams.
Skinless chicken breast is the classic example of a lean protein. A 100-gram serving has about 3.6 grams of total fat and 31 grams of protein, comfortably clearing those thresholds. Salmon, depending on the species and whether it’s farmed or wild, lands in a very different place.
Fat Content Varies by Species
Not all salmon is created equal when it comes to fat. USDA nutrient data shows a wide range across species and farming methods:
- Wild Atlantic salmon (raw): 6.3 grams of fat per 100 grams
- Sockeye (red) salmon (raw): 8.6 grams of fat per 100 grams
- Farmed Atlantic salmon (raw): 10.8 grams of fat per 100 grams
- Chinook (king) salmon (raw): 11.7 grams of fat per 100 grams
Wild Atlantic salmon technically squeaks under the 10-gram lean cutoff when raw, but cooking concentrates nutrients as water evaporates, which can push the numbers higher. Farmed Atlantic salmon, the type most commonly sold in grocery stores, exceeds the lean threshold even before cooking. A cooked 100-gram portion of farmed Atlantic salmon contains about 12.4 grams of total fat, more than three times the fat in the same amount of chicken breast. King salmon, the richest variety, is fattier still.
Wild coho salmon is the leanest commonly available option, with roughly 4.3 grams of fat per 100 grams when cooked, which would actually qualify it as extra lean by the numbers alone.
Why Salmon’s Fat Is Different
The reason nutritionists recommend salmon despite its higher fat content comes down to what kind of fat it carries. Salmon is one of the richest dietary sources of EPA and DHA, the two omega-3 fatty acids most strongly linked to heart and brain health. A single 3-ounce serving of cooked Atlantic salmon delivers roughly 1.5 to 1.8 grams of combined EPA and DHA, whether it’s farmed or wild.
Compare that to lean fish like cod, tilapia, or flounder. These qualify as lean proteins with very low fat content, but they provide almost no omega-3s. The trade-off is real: you get fewer calories and less fat, but you miss the specific nutritional benefit that makes fish valuable in the first place. This is why the American Heart Association recommends eating two servings of fish per week, specifically highlighting fatty fish like salmon rather than lean varieties.
Salmon vs. Chicken for Protein
If you’re choosing between salmon and chicken breast purely for lean protein, chicken wins on the numbers. A 100-gram serving of skinless chicken breast has about 31 grams of protein and 165 calories. The same portion of farmed Atlantic salmon has 22 grams of protein and 206 calories. Chicken is leaner, higher in protein per calorie, and cheaper.
But framing salmon as a protein source misses the point. You eat salmon for its fat, not in spite of it. Those omega-3 fatty acids reduce inflammation, support cardiovascular health, and are difficult to get in meaningful amounts from other foods. A 3-ounce serving of salmon covers the American Heart Association’s recommendation in a single sitting. Chicken breast, no matter how much you eat, provides essentially none.
Choosing the Right Salmon for Your Goals
If you’re watching total fat intake but still want salmon’s omega-3 benefits, wild-caught varieties are your best bet. Wild coho and sockeye run significantly leaner than farmed Atlantic, with coho coming in around 4 grams of fat per cooked serving. Canned pink salmon is another affordable, lower-fat option that still delivers meaningful omega-3s, about 0.9 grams of combined EPA and DHA per 3-ounce portion.
Farmed Atlantic salmon, the default at most supermarkets, is the fattiest option. It’s also the most widely available and tends to have a milder flavor. If total calories and fat grams aren’t a concern, it’s perfectly nutritious. King salmon is the richest of all, prized for its buttery texture, but at nearly 12 grams of fat per 100 grams raw, it’s firmly in the “fatty” category.
Regardless of the variety, salmon delivers around 20 grams of protein per 100 grams raw, making it a solid protein source even if it doesn’t fit the technical definition of lean. The fat it carries is the kind most people don’t get enough of.