From what I’ve read, it’s mostly just a fancy name
for catfish, designed to get you to think you’re getting something special
instead of plain old catfish. (Note: It's farmed in Vietnam, in case you're concerned about imported fish.) My favorite seafood cookbook, Jane Brody’s Good Seafood Book, which
came out in 1994, doesn’t mention Swai, but does talk about catfish. Here’s
what she had to say about catfish.
Fish with similar taste and texture to catfish -
carp, mullet, perch, porgy, salmon trout, sea bass, smelt, Spanish mackerel,
striped bass, tilefish, and walleye
Fish with similar taste but more delicate texture
than catfish – pollack, sea trout, trout and whiting
Fish with similar taste but firmer texture than
catfish – char, grouper, mahi-mahi, and red snapper
Fish with similar texture but more delicate flavor
than catfish – blackfish, cod, croaker, halibut, ocean pout, pike, pompano,
redfish, skate, triggerfish, turbot, wahoo, and whitefish
Fish with similar texture but stronger flavor than
catfish – bluefish, eel, mackerel, pomfret, sablefish, salmon, and yellowtail
What I found when I cooked some was that it fell
apart easily and didn’t taste particularly fishy. I guess I would call that
delicate taste and texture, though Jane Brody’s book calls them both medium.
You can use catfish or Swai in any recipe that calls
for any of the fish listed above, though of course you need to consider the
size of the pieces, too. Substituting Swai nuggets for a halibut steak, for
example, wouldn’t work, though you could use the same seasonings and adjust the
cooking time and method for the smaller pieces.