The term "Shad" refers to several species, notably the American Shad (Alosa sapidissima). These are medium-sized fish, usually around 20 inches long, known for their silvery b... The term "Shad" refers to several species, notably the American Shad (Alosa sapidissima). These are medium-sized fish, usually around 20 inches long, known for their silvery bodies and deeply forked tails. Shad are anadromous, migrating from the ocean to freshwater rivers to spawn. They feed on plankton and small invertebrates. American Shad are particularly significant for their historical economic value and are now the focus of various restoration efforts.Click here to read more about Shad.