Salmon is not a low-fat food. It is classified as a “fatty fish,” and depending on the species and whether it’s farmed or wild, a 3.5-ounce serving contains between 4 and 12 grams of fat. Under FDA labeling rules, a food qualifies as “low fat” only if it has 3 grams of fat or less per serving. Every type of salmon exceeds that threshold. But that fat is exactly why nutrition experts recommend eating salmon regularly.
How Much Fat Salmon Actually Contains
The fat content of salmon varies widely by species and how it was raised. Wild Atlantic salmon has about 8 grams of total fat per 100-gram (3.5-ounce) cooked serving, while farmed Atlantic salmon comes in higher at roughly 12.4 grams. Among wild Alaskan species, king salmon is the fattiest at about 11 grams per 3-ounce serving, sockeye has around 5 grams, and pink salmon is the leanest at about 4 grams.
For context, about 30% of the calories in a serving of pink or chum salmon come from fat. In farmed Atlantic salmon, that percentage climbs higher. A peer-reviewed analysis published in Environmental Science & Technology found that farmed salmon averaged 16.6% total lipid content compared to just 6.4% in wild salmon, meaning farmed fillets contain roughly two and a half times more fat overall.
Salmon vs. Lean Fish
If you’re specifically looking for low-fat protein, white fish is the better choice. Lean fish like haddock, pollock, flounder, catfish, and halibut all contain less than 3 grams of fat per ounce, or under 10 grams per 100-gram portion. Most fall well below those numbers. Cod and tilapia, two of the most popular white fish, have a fraction of the fat found in salmon.
Salmon, along with sardines, herring, trout, and tuna, falls into the “fatty fish” category. That label sounds like a warning, but it’s actually the reason these fish are singled out as especially healthy. The fat in salmon is predominantly unsaturated, and a large share of it comes from omega-3 fatty acids, the type linked to heart and brain health.
Why Salmon’s Fat Is Different
The fat in salmon is rich in two specific omega-3 fatty acids, EPA and DHA, that your body can’t produce on its own. These are the same compounds behind the longstanding recommendation to eat one to two servings of seafood per week. Major health organizations, including the American Heart Association, point to these omega-3s as a key factor in reducing the risk of heart failure, coronary heart disease, stroke, and sudden cardiac death.
Wild salmon has a particularly favorable fat profile. The ratio of omega-3 to omega-6 fatty acids in wild salmon runs about 10 to 1. In farmed salmon, that ratio drops to roughly 4 to 1, largely because farmed fish are raised on feed that’s about one-third fat from various sources. Both ratios are still considered healthy, but wild salmon delivers more omega-3 benefit per gram of fat.
Choosing a Species Based on Your Goals
If you want the omega-3 benefits of salmon but prefer to keep fat intake on the lower side, pink salmon and sockeye are your best options. Pink salmon, at around 4 grams of fat per 3-ounce serving, is the leanest commonly available species and also tends to be the most affordable. Sockeye, at about 5 grams, has a richer flavor while staying relatively moderate in fat.
King salmon sits at the opposite end of the spectrum. With 11 grams of fat per serving, it’s the richest and most buttery-tasting species, prized for its texture but also the highest in calories. Farmed Atlantic salmon, which is what you’ll most often find at supermarkets, lands in a similar range at around 12 grams per 3.5-ounce serving.
For people on a strictly low-fat diet for medical reasons, even pink salmon won’t qualify as “low fat” by FDA standards. But for most people trying to eat well, the type of fat matters more than the total grams. Replacing a serving of red meat or processed food with salmon, even the fattier varieties, is the kind of swap that health guidelines actively encourage. The fat in salmon is the feature, not the drawback.