Dried shark fin, softened by long soaking and boiling into chewy, gelatinous strands with almost no taste of their own. It is served in a rich stock as soup at weddings and banquets; cheaper soups use imitation fin.
鱼翅 (literally 'fish wing') refers specifically to shark fins, the dried cartilaginous fin rays prized for shark fin soup (鱼翅汤), historically a luxury dish at Chinese banquets. The trade is now widely opposed on conservation grounds, and many mainland banquets and Hong Kong hotels have removed it from menus.