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Alosa sapidissima
Image courtesy of Don Flescher - USGS Nonindigenous Aquatic Species Database, Gainesville, FL
Alosa sapidissima
Taxonomic Group: Fishes
Common name: AMERICAN SHAD


American Shad (Alosa sapidissima) are anadromous fish native to the East Coast of North America. In the 19th century, they were a hugely popular fish on the East Coast where they were part of a well establish fishery. This popularity led to their intentional introduction on the West Coast and the establishment of shad fisheries from San Francisco Bay to the Columbia River. Over the years shad’s popularity on the dinner plate has declined, as did their abundance, but they are still established in San Francisco Bay and the Columbia River and several locations in-between. Shad may compete with native fish for zooplankton, and in 1988 contributed to an amplified epizootic of the protozoan parasite Ichthyophonus, which is a potential threat to other marine and anadromous fishes.

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Fofonoff PW, Ruiz GM, Steves B, Simkanin C, & Carlton JT (2018)
National Exotic Marine and Estuarine Species Information System.
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Marine Invasions Lab
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