Salmon is one of the fattiest fish you can eat. With a fat content ranging from about 6 to 12 grams per 100 grams of raw flesh depending on the species, salmon comfortably falls into the “fatty fish” category, which is defined as fish containing more than 6 percent fat. That fat is largely what makes salmon so nutritious.
What Makes a Fish “Fatty”
Fish are generally grouped into three tiers based on their total fat content. Lean fish like cod and sole contain 2 to 5 percent fat. Medium-fat fish like sea bass sit around 5 to 6 percent. Fatty fish, sometimes called oily fish, range from 6 to 25 percent fat. This group includes salmon, mackerel, herring, sardines, and anchovies.
You can often tell where a fish falls just by looking at it. Lean species like cod and flounder have white or light-colored flesh, while fattier species like salmon, herring, and mackerel are noticeably darker. That color difference comes partly from the higher concentration of oils distributed throughout the muscle tissue rather than stored mainly in the liver, which is where leaner fish keep most of their fat.
How Much Fat Is in Salmon
The fat content varies quite a bit across salmon species. USDA testing puts the numbers at roughly these levels per 100 grams of raw fish:
- Chinook (King) salmon: 11.7 grams of fat
- Farmed Atlantic salmon: 10.8 grams
- Sockeye (Red) salmon: 8.6 grams
- Wild Atlantic salmon: 6.3 grams
For context, cod has less than 2 grams of fat in the same portion. Even at the lower end, wild Atlantic salmon has more than three times the fat of a typical lean white fish. Atlantic and Chinook salmon rank in the “high fat” tier (10 grams or more per cooked serving), while Sockeye and Coho fall into the “medium fat” range. Leaner species like Pink and Chum salmon drop further down, landing in the 2 to 5 gram range, which puts them closer to tilapia than to their fattier cousins.
Farmed vs. Wild Salmon
Farmed salmon carries roughly double the total fat of wild salmon. A 3-ounce fillet of wild salmon has about half the fat and fewer calories than the same portion of farmed. Farmed salmon does contain more omega-3s in absolute terms, but it also packs more than double the saturated fat, which is the less desirable kind.
Wild salmon gets its fat primarily from a natural diet of smaller fish and crustaceans, which tends to produce a cleaner omega-3 profile. Farmed salmon is fattier largely because of its feed and limited movement in pens. Both are still considered fatty fish, and both deliver meaningful amounts of omega-3s. The trade-off is straightforward: farmed gives you more total fat (including more saturated fat), while wild is leaner with a better ratio of beneficial fats.
Why the Fat in Salmon Matters
The reason “fatty fish” is a positive label comes down to the type of fat. Salmon is one of the richest sources of omega-3 fatty acids, particularly the long-chain forms (EPA and DHA) that your body can use directly. These fats get incorporated into cell membranes throughout the body, where they influence how cells communicate and respond to inflammation. They help produce compounds called resolvins and protectins that actively calm inflammatory processes, which is one reason consistent fish intake is linked to lower cardiovascular risk.
The American Heart Association recommends eating fish at least twice a week, specifically calling out fatty fish like salmon, mackerel, sardines, and herring. A serving is 3 ounces cooked, roughly three-quarters of a cup of flaked fish. That twice-weekly target is consistently associated with reduced risk of heart disease.
How Cooking Affects the Fat
One concern people have is whether cooking destroys the beneficial fats. The short answer: it doesn’t. Research comparing raw salmon to salmon prepared by steaming, baking, microwaving, and canning found no drastic changes in the overall fatty acid profile. In fact, steamed salmon showed a significant increase in omega-3 concentration (about 21 percent higher than raw controls) and an improved omega-3 to omega-6 ratio.
Frying and oven cooking at high temperatures can slightly reduce the omega-3 to omega-6 balance, mainly because cooking oils add omega-6 fats to the dish. If you want to preserve the best fatty acid profile, steaming and poaching are your strongest options. But even baked or grilled salmon retains the vast majority of its omega-3 content. The cooking method matters far less than simply eating salmon regularly.
How Salmon Compares to Other Fish
Among commonly eaten fish, salmon sits near the top for fat content but not at the absolute peak. Mackerel, herring, and sardines are comparable or slightly fattier, with the highest-fat species reaching around 15 percent total fat. A cooked 3-ounce serving of these fattier fish runs about 200 calories, while the same portion of a lean fish like cod comes in under 100.
At the other end of the spectrum, popular choices like shrimp, tilapia, and canned tuna are very low in fat. They provide protein without much omega-3 benefit. If your goal is specifically to increase omega-3 intake, salmon, mackerel, sardines, and herring are the fish to prioritize. Salmon tends to be the most accessible and mildly flavored of that group, which is a big part of why it gets recommended so often.