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Definition of SHAD
: any of several fishes (especially genus Alosa) of the herring family that differ from the typical herrings (genus Clupeus) in having a relatively deep body and in being anadromous and that include some important food fishes of Europe and North America
Any of several saltwater food fishes of the herring family (Clupeidae) that swim up rivers to spawn. Shad eggs (roe) are a delicacy in the U.S. Adult shad are toothless. The lower jaw of shad in the genus Alosa fits into a notch at the tip of the upper jaw. The American shad (A. sapidissima), an Atlantic fish introduced into the Pacific, is a migratory plankton eater and a good game fish. The Allis (or Allice) shad (A. alosa) of Europe is about 30 in. (75 cm) long and weighs about 8 lbs (3.6 kg). See alsowhitefish.