Gwyniad (Coregonus clupeoides), a small freshwater fish, sometimes called the Fresh-water Herring. When full grown the gwyniad is about 10 or 12 inches in length; the first dorsal fin is high; the jaws are a little produced; the mouth is small, and the jaws are without teeth. It is found in some of the lakes of Wales and Cumberland. Gwyniad is a Welsh name, while at Ullswater the fish is called Schelly. It occurs in that lake in great shoals, so that many hundreds are sometimes taken at a single draught of the net. It is rather an insipid fish, and cannot be kept long after being taken out of the water, unless salted, which it often is by the poor. There are numerous nearly-related species, such as the Irish 'pollan' (C. pollan), the 'powan' of Loch Lomond, the 'vendace' (C. vandesius) of Lochmaben, and the 'white fish' of North American lakes. See COREGONUS.