Catfish is a nutritious, low-calorie fish that delivers high-quality protein with very little saturated fat. A 100-gram serving of raw catfish contains about 97 calories, 18.6 grams of protein, and just 2.5 grams of total fat. It’s one of the lowest-mercury fish you can eat, and the FDA classifies it as a “Best Choice” for weekly consumption.
Protein and Fat Profile
Catfish is a lean protein source by almost any measure. With only 0.5 grams of saturated fat per 100-gram serving and 55 milligrams of cholesterol, it fits comfortably into heart-healthy eating patterns. For context, a typical chicken breast has comparable protein but catfish edges it out on certain micronutrients that only come from seafood.
Compared to tilapia, another popular white fish, catfish has slightly more fat (about 7.4 grams per 100 grams of fillet versus 5.7 for tilapia) and a bit less protein (17.3 grams versus 20.3). That difference is modest, and catfish makes up for it with a richer supply of omega-3 fatty acids.
Omega-3s and Heart Health
A single serving of catfish provides up to 300 milligrams of EPA and DHA, the two omega-3 fatty acids your body uses most directly. That’s less than what you’d get from salmon or mackerel, but it’s a meaningful amount, especially if you eat catfish regularly. These fats help regulate heart rhythm, reduce blood clotting risk, and support healthy blood vessel function.
Omega-3s also play a role in brain health. Research links regular intake to better memory, reduced symptoms of depression, and slower cognitive decline with age. They’ve also been associated with improvements in muscle strength and gut health. Catfish won’t give you the omega-3 payload of a fatty fish, but it contributes steadily if it’s part of your regular rotation.
Key Vitamins and Minerals
Catfish is a strong source of vitamin B12, which supports red blood cell production and nervous system function. Adequate B12 levels are tied to better mental health, lower heart disease risk, and prevention of anemia. Many people, especially older adults and those eating less meat, fall short on B12. A serving or two of catfish each week helps close that gap.
It also supplies selenium, phosphorus, and other trace minerals that support thyroid function, bone health, and immune response. These nutrients are harder to get from plant-based diets, making catfish a practical option for people looking to round out their intake without eating red meat.
Mercury Is Extremely Low
One of catfish’s biggest advantages is its mercury content, which is among the lowest of any commercial fish. FDA testing from 1990 to 2010 found an average mercury concentration of just 0.024 parts per million across 59 samples. Some samples had no detectable mercury at all. For comparison, swordfish typically measures above 0.9 ppm.
This makes catfish safe for virtually everyone, including pregnant and breastfeeding women. The FDA recommends that pregnant women eat two to three servings per week (a serving being 4 ounces) from the “Best Choices” list, and catfish is on it. For the general population, the Dietary Guidelines recommend at least 8 ounces of seafood per week.
Farmed vs. Imported: What to Know
Most catfish sold in the United States is farm-raised domestically, and those farms operate under federal inspection by the USDA’s Food Safety and Inspection Service. U.S. farm-raised catfish are not given hormones, and they’re randomly tested for drug residues as part of routine inspection.
You may also see fish labeled “basa” or “swai” at the store. These are related species, primarily imported from Vietnam, and they cannot legally be labeled “catfish” in the U.S. They’re sold under names like “striped pangasius” or “tra.” While they’re generally safe to eat, they don’t fall under the same USDA inspection framework as domestic catfish. If food sourcing matters to you, look for U.S. farm-raised catfish on the label.
How You Cook It Matters
Catfish’s nutritional strengths can be undermined by preparation. A baked or grilled fillet retains the low-calorie, low-fat profile that makes catfish appealing in the first place. Deep-frying it in batter, the traditional Southern preparation, adds significant calories, fat, and refined carbohydrates. A fried catfish fillet can easily double or triple the calorie count of a plain baked one.
If you enjoy fried catfish, treating it as an occasional meal rather than a staple is a reasonable approach. For everyday eating, baking, grilling, or pan-searing with a small amount of oil preserves the nutritional benefits. A squeeze of lemon and simple seasoning is usually all it needs.