Or how the Pangasianodon lost its teeth. So I am making a stir-fry using a recipe from the excellent Chinese cookbook ' Ken Hom's Hot Wok .' It is a great book from which we have not had a bad meal after trying 30 of the recipes, and I now always use his 'one pint of water to 400 g of rice' method for steamed rice . The recipe in question this time was stir-fried fish with black bean sauce , which required procuring some white fish. So off to the supermarket to get some. Cod fillets were available at £14/kg and something called basa at £10.50/kg (or 25% cheaper). As stir-fry flavours are usually robust, cheaper is OK with me. But what sort of fish is a basa? The source of the fish stated that it was Pangasianodon hypophthalmus ; so that is the binomial name for a basa fish, yes? No, in Vietnam P. hypophthalmus is called tra and basa is a different, although closely related, catfish species Pangasius bocourti . P. hypophthalmus is preferred