- a deep-bodied herring, Alosa sapidissima, of Europe and North America, that migrates up streams to spawn, used for food.
- any other fish of the genus Alosa or related genera.
- any of several unrelated fishes.
- any of various herring-like food fishes of the genus Alosa and related genera, such as A. alosa (allis shad) of Europe, that migrate from the sea to freshwater to spawn: family Clupeidae (herrings)
- any of various similar but unrelated fishes