Alewife

Also called  Sawbelly, Grayback, Gaspereau, or Branch Herring  (Pomolobus, or Alosa, pseudoharengus), important North American food fish of the herring family, Clupeidae. Deeper-bodied than the true herring, the alewife has a pronounced saw-edge on the underside; it grows to about 30 cm (1 foot). Except for members of a few lake populations, it spends several years along the Atlantic coast of North America before