Chub (Leuciscus cephalus), a fish of the carp family Cyprinidae, of the same genus with the roach, dace, bleak, minnow, &c. The colour is bluish-black on the upper parts, passing into white on the belly; the cheeks and gill-covers rich golden yellow. The weight rarely exceeds 5 lb. It is plentiful in the rivers of England, and occurs in some of those of the south-west of Scotland, in Europe, and in Asia Minor. It spawns in April and May, and comes into condition again by the end of June or early in July. It prefers rapid water and a clear bottom, and often hides in holes. Its diet is very mixed. It is not much esteemed for the table. The scales have been used for making artificial pearl. See PEARLS. The common American chub is the Leucosomus rhotheus.