Any of several small freshwater fishes (genera Notemigonus and Notropis, family Cyprinidae). The common shiner (Notropis cornutus) is a blue and silver minnow up to 8 in. (20 cm) long. The golden shiner (Notemigonus cryseleucas), sometimes called the American roach, is a greenish and golden minnow, about 12 in. (30 cm) long and weighing 1.5 lbs (0.7 kg). It is edible and valuable as bait.