silversides, common name for small shore fishes, belonging to the family Antherinidae, abundant in the warmer waters of the Atlantic and Pacific, and named for the silvery stripe on either side of the body. Silversides, known commercially as whitebait, eat insects and small crustaceans. The small (3 in./7.5 cm) tidewater silversides, Menidia menidia, is found along the Atlantic coast; the similar brook silversides is a freshwater species. Larger and better known is the California grunion (5–8 in./12.5–20 cm), which rides in on high tides to lay its eggs in the sand. Beached grunions are collected by hand in large quantities. Other Pacific silversides are the top smelts and jack smelts, important to California's fisheries. Silversides are classified in the phylum Chordata, subphylum Vertebrata, class Actinopterygii, order Atheriniformes, family Antherinidae.