What is "allis shad"

Alose \A"lose\, n. [F., fr. L. alosa or alausa.] (Zo["o]l.) The European shad ( Alosa alosa formerly Clupea alosa); -- called also allice shad or allis shad. The name is sometimes applied to the American shad ( Alosa sapidissima formerly Clupea sapidissima). See Shad.

n. European shad [syn: allice shad, allice, allis, Alosa alosa]

The allis shad (Alosa alosa) is a widespread Northeast Atlantic species of fish in the herring family Clupeidae. It is an anadromous fish which migrates into fresh water to spawn. It is found in the eastern Atlantic Ocean, the western Baltic Sea and the western Mediterranean Sea. In appearance it resembles an Atlantic herring but has a distinctive dark spot behind the gill cover and sometimes a row of up to six spots behind this. It sometimes hybridises with the twait shad (A. fallax). This fish becomes mature when three or more years old and migrates to estuaries, later swimming up rivers to spawn. Populations of this fish have declined due to overfishing, pollution and habitat destruction. Conservation of this species is covered by Appendix III of the Bern Convention and Appendix II and V of the European Community Habitats Directive.