A 100-gram serving of raw catfish contains about 18.6 grams of protein, making it one of the leaner, protein-rich options in the seafood aisle. A standard 4-ounce serving (roughly 112 grams) delivers 15 to 19 grams of protein depending on the cut and preparation, all for a relatively low calorie cost.
Protein by Serving Size
Raw catfish provides 18.6 grams of protein per 100 grams. Since cooking removes moisture and concentrates nutrients, a cooked fillet of the same starting weight will test slightly higher in protein per gram. In practical terms, here’s what common portions look like:
- 3 ounces (85 g) raw: approximately 16 grams of protein
- 4 ounces (112 g) raw: 15 to 19 grams of protein
- One typical fillet (about 6 ounces cooked): roughly 26 to 30 grams of protein
The current daily reference value for protein is 50 grams on a 2,000-calorie diet, so a single fillet covers more than half of that target. For people aiming higher, such as 0.7 to 1 gram per pound of body weight for muscle maintenance, two fillets at dinner get you well past 50 grams from one meal.
What Else Comes With the Protein
Catfish is more than just a protein source. A 3.5-ounce serving supplies 121% of the Daily Value for vitamin B12, a nutrient critical for nerve function and red blood cell production. The same serving covers 26% of the Daily Value for selenium (which supports thyroid health and acts as an antioxidant) and 24% for phosphorus (important for bone structure).
Fat content is low overall, but catfish does provide some omega-3 fatty acids. Channel catfish contains about 0.1 grams of EPA and 0.2 grams of DHA per 100 grams of flesh. That’s modest compared to salmon or mackerel, but it still contributes to your weekly omega-3 intake, especially if you eat catfish regularly.
Farmed vs. Wild-Caught Protein
Protein levels are essentially the same whether your catfish was farm-raised or caught in the wild. Research comparing pond-raised and wild catfish found no significant difference in crude protein: about 13.4% for farmed and 12.3% for wild. The real gap shows up in fat. Wild catfish carried roughly 11% fat compared to about 5% in farmed fish, likely because wild fish have more variable diets and activity levels. If you’re choosing catfish primarily for protein, either option works equally well.
How Cooking Method Changes the Numbers
Baking or grilling a plain catfish fillet preserves its protein density while keeping added fat to a minimum. Frying changes the equation. Breaded and battered catfish absorbs oil during cooking, which increases total calories and dilutes the protein-to-calorie ratio. USDA research found that par-fried and then baked catfish had significantly higher oil content than catfish that was simply baked, particularly with corn and wheat batters.
This doesn’t mean fried catfish loses protein. The protein is still there. But the added fat and breading calories mean you’re getting proportionally less protein per bite. A baked fillet where protein makes up the majority of calories becomes a fried fillet where fat and carbohydrates from the coating compete for that space. If protein density matters to you, baking, grilling, or blackening are the better preparation methods.
Is Catfish Protein Complete?
Like virtually all animal proteins, catfish provides all nine essential amino acids your body can’t make on its own. Fish muscle tissue naturally contains leucine, lysine, methionine, and the other amino acids needed for muscle repair and general body function. You don’t need to pair catfish with other protein sources to get a complete amino acid profile.
Mercury and How Often You Can Eat It
Catfish is classified as a “Best Choice” by the EPA and FDA, meaning it’s among the lowest-mercury fish available. You can safely eat two to three servings per week. This makes catfish one of the few affordable, high-protein fish that families can eat multiple times a week without worrying about mercury accumulation. It’s also specifically recommended for children by the Dietary Guidelines for Americans because of its low mercury levels.
One caveat: catfish caught recreationally from local rivers or lakes may carry higher contaminant levels depending on the water source. If you’re eating fish caught by family or friends, check your state’s fish advisories. When no advisory exists, the EPA recommends limiting yourself to one serving that week and skipping other fish.