Bluestreak drum

The bluestreak drum, Elattarchus archidium, also called the bluish croaker, is a marine ray-finned fish in the family Sciaenidae, the drums and croakers. It is the only species in the monospecific genus Elattarchus. It was first described as Odontoscion archidium in 1882 by David Starr Jordan and Charles Henry Gilbert from Panama Bay, and Jordan and Barton Warren Evermann moved it into its own genus in 1896. The fish has a moderately elongate, compressed body with a blunt snout and a large, upward sloping mouth, a bluish-gray back fading to silver below, and a black blotch near the top of the gill cover. It reaches a maximum published total length of 43.9 centimetres, though about 15 centimetres is more typical. It lives in the central eastern Pacific Ocean from Magdalena Bay in Baja California Sur, through the Gulf of California, south to northern Peru, on sandy bays, lagoons and estuaries down to about 60 metres, and the juveniles gather in large schools near rocky reefs. It feeds on crustaceans and fish larvae, and little else is known of its biology.