Swai vs Catfish: Are They the Same Fish? Taste, Safety & Price

Swai vs catfish: they are not the same fish. Swai is Pangasianodon hypophthalmus, a river catfish farmed in Vietnam’s Mekong Delta, and federal law says it cannot be sold as “catfish” in the United States; that name is reserved for the family Ictaluridae, which includes the US farm-raised channel catfish. Swai is cheaper, very mild and soft; US catfish is firmer, slightly sweet and rated a sustainable Best Choice.

If the menu says “catfish,” you are getting an Ictalurid, almost always American pond-raised channel catfish. If it says “swai,” “basa” or “pangasius,” you are getting the Vietnamese fish. Pay for the catfish.

Swai vs catfish at a glance

	Swai	US farm-raised catfish
Species	Pangasianodon hypophthalmus (FDA Seafood List), family Pangasiidae; also sold as sutchi, striped pangasius or tra	Channel catfish, Ictalurus punctatus, family Ictaluridae; “virtually all” US commercial catfish production (Mississippi State)
Where it is raised	Ponds and river cages in the Mekong Delta, Vietnam (Seafood Watch)	Clay ponds filled with well water in Mississippi, Alabama, Arkansas and Louisiana (The Catfish Institute)
Legal name	Cannot be labeled “catfish” in the US (21 U.S.C. 343(t)); must use swai, basa or another accepted market name	May be labeled catfish; look for “U.S. Farm-Raised Catfish”
Flavor	Very mild, neutral, faintly sweet; takes on whatever it is cooked with	“Consistently mild, slightly sweet” (The Catfish Institute); more flavor than swai
Texture	Soft, fine flake, holds moisture; can turn mushy	“Firm, white flesh” (Mississippi State); holds together when fried
Price	Lower; typically the cheapest white fillet in the freezer case	Higher; a domestic product with inspection costs
Sustainability	Seafood Watch: Avoid (red) for Vietnam pond-raised unless ASC, BAP or Naturland certified	Seafood Watch: Best Choice (green), US ponds, score 7.62
Nutrition, per 100 g cooked	No USDA standard-reference entry for swai	144 calories, 18.4 g protein, 7.2 g fat, 0.09 g EPA+DHA (USDA)
Mercury	Not on the FDA/EPA list by name	Catfish: FDA/EPA “Best Choice,” lowest-mercury tier

Is swai a catfish?

Biologically, yes; legally, no. Swai belongs to the order Siluriformes, the catfishes, but to the family Pangasiidae, the shark catfishes of Southeast Asia. The 2007 Seafood Watch report on farmed pangasius identifies swai as Pangasius hypophthalmus (now Pangasianodon hypophthalmus), native to the lower Mekong basin of Cambodia, Laos, Thailand and Vietnam, and its cousin basa as Pangasius bocourti. The same report notes both species tolerate low-oxygen water and grow on diets low in fishmeal, which is why Vietnam can raise them so cheaply.

US law draws the line at the family. Under the Federal Food, Drug, and Cosmetic Act, a food is misbranded “if it purports to be or is represented as catfish, unless it is fish classified within the family Ictaluridae.” The FDA’s Seafood List makes the practical result clear: for Pangasianodon hypophthalmus the acceptable market names are “Swai or Sutchi or Striped Pangasius or Tra,” and the common name “Sutchi Catfish” is marked as prohibited. The Catfish Institute, the US producers’ trade group, says imported catfish-type fish “is often mislabeled,” so a restaurant selling swai as catfish is breaking federal labeling law, not splitting hairs.

Inspection is split too. Fish of the order Siluriformes, domestic and imported, fall under the USDA’s Food Safety and Inspection Service rather than the FDA, and FSIS’s 2018 guideline spells out the labeling rules importers must follow for pangasius at official import establishments.

What does swai taste like compared to catfish?

Swai is the blank canvas of white fish: very mild, faintly sweet, with a soft, fine flake and a lot of moisture. It has almost no “fishy” character, which is why it shows up unnamed in cheap fish sandwiches and frozen breaded fillets. The downside is the texture: it is softer than channel catfish and goes mushy if overcooked or thawed badly. The 2007 Seafood Watch report adds a quality note from the farms themselves: fish raised in fertilized ponds on homemade feed can develop “a muddy flavor and yellowish color” that export markets reject, which is why exporters favor white, cage-raised fish.

US farm-raised channel catfish has more going on. Mississippi State University Extension describes “firm, white flesh with a mild flavor,” and The Catfish Institute describes it as “consistently mild, slightly sweet,” crediting the floating, soybean-based pellet feed and clean well water for keeping the muddy taste of wild river catfish out of the ponds. In a cornmeal crust, catfish stays flaky and holds its shape; swai softens and leans on the breading. For a fuller profile, see what catfish tastes like.

Is swai safe to eat?

Swai sold in the US is inspected and legal, and there is no FDA mercury advisory against it; pangasius is a fast-growing, low-on-the-food-chain farmed fish. The documented concerns are environmental and about farming practice, not acute food safety. Seafood Watch rates Vietnamese pond-raised sutchi catfish (pangasius) as red, Avoid, because “the hyper-intensive production that occurs in Vietnam generates large volumes of effluent,” many farms are “reportedly engaging in illegal dumping,” and there is evidence of “very high” chemical use “including antibiotics that are critically important to human health.” Its advice is to buy pangasius certified by the Aquaculture Stewardship Council, Best Aquaculture Practices or Naturland, which the February 2024 list rates as certified-equivalent to a Good Alternative.

US channel catfish is the easier call. Seafood Watch rates US pond-raised channel catfish a green Best Choice with a 7.62 score, and the FDA/EPA fish advice lists catfish among its “Best Choices” for mercury. The Catfish Institute says antibiotics are used only to treat illness and no hormones are added. The “swai fish controversy” you will see online comes down to those farm-practice findings plus a long trade fight: the 2007 Seafood Watch report notes US imports of basa and swai grew through the 1990s until anti-dumping duties in 2003 cut them in half, a fight that ran alongside the “catfish” naming law and, later, USDA inspection of imports.

Is swai cheaper than catfish?

Yes, consistently. Swai is one of the lowest-priced white fillets in the freezer case because Vietnam raises it at enormous scale on cheap feed; the 2007 report estimated Vietnam’s export production at 350,000 tons as early as 2004, 90 percent of it swai. Domestic catfish costs more to raise and is inspected on US soil. Exact prices move with the season and the store, so compare per-pound prices on the day; as a rule, if a restaurant “catfish” plate is suspiciously cheap and the fish is pale and soft, ask what species it is.

Swai vs tilapia

Swai and tilapia compete for the same cheap-white-fish slot, and tilapia is the better of the two for most cooks: it is a little firmer with a cleaner, mildly sweet flavor, and Seafood Watch treats ASC- or BAP-certified tilapia as equivalent to a Good Alternative, while uncertified Vietnamese swai is an Avoid. Catfish beats both on texture and on sustainability. Our catfish vs tilapia and what tilapia tastes like guides take that comparison further.

Which should you buy or order?

Southern fish fry, cornmeal crust: US farm-raised channel catfish. The firm flake is the whole point.
Blackened or grilled fillet: catfish. Swai is too soft to hold up without breading.
Fish tacos or a budget sandwich: swai is acceptable if it is ASC or BAP certified; otherwise choose tilapia or catfish.
Feeding kids who dislike “fishy” fish: either works; swai is the mildest fish in the case, catfish is nearly as mild with better texture. See the mild fish chooser.
Restaurant menu that just says “fish”: ask. Fish On Fire names its fish, and the menu is built on Gulf grouper, mahi and shrimp rather than imported fillets.

Bottom line

Swai is a Vietnamese pangasius that cannot legally be called catfish in the US; channel catfish is the American Ictalurid that can. Catfish tastes better, holds together better and carries a Best Choice rating; swai is cheaper and softer, and only worth buying when it is certified.

Swai vs Catfish: What's the Difference?