Fish maw is dried swim bladders of enormous fishes. A fast search on Internet described it as almost tasteless which I disagree. I’ve purchased a few grades of fish maw from Kuantan and Kota Kinabalu (equally famed for seafood produce) and seen that better high quality types odor and tastes drastically improved. https://remingtonh6654.laowaiblog.com/33402948/the-fact-about-花膠-that-no-one-is-suggesting