In Cantonese cuisine, fish maw (魚肚 / 魚膠, yu4 tou5 or yu4 gaau1) is the dried swim bladder of large fish such as croaker, sturgeon, or catfish. This air-filled organ helps fish stay buoyant in water, but once dried, it transforms into a highly prized delicacy. Valued more for its silky, collagen-rich texture and nutritional benefits than for its mild flavor, fish maw is a staple ingredient in many traditional soups and celebratory dishes.

Fish maw itself has a very mild, almost neutral taste — it doesn’t have the “fishy” flavor you might expect from seafood. Instead, it acts like a sponge, soaking up the flavors of the ingredients it’s cooked with, such as chicken broth, dried scallops, mushrooms, or Chinese ham.

What people love about fish maw isn’t its flavor, but its texture — soft, smooth, and slightly springy, similar to gelatin or slow-cooked tendon. When prepared well, it gives soups and braised dishes a luxurious, silky mouthfeel that’s deeply satisfying.