I was born in South America where I enjoyed this "Kwie Kwie" which is actually an armoured catfish (See Hoplosternum_littorale in Wikipedia)
I believe it's normally cooked in curry or with salted meats but I haven't had it since I left there (~30 years). I've recently found a place in Toronto that sells this fish and now I'm dying to have a taste of it again.
The tricky parts about cooking this fish is that it has a strong taste (I think soaking it in lemon & water will reduce this) and it needs to be braised because the armour should fall off when served. Does anyone know of a recipe?