Invasion
Invasion Description
1st Record: Tehama/CA/Sacramento River (Smith 1895; Shebley 1917)
Geographic Extent
CA/San Francisco Bay and lower Sacramento-San Joaquin drainage; Mendecino-Sonoma Counties/CA/Russian River (breeding?); Cape May/CA/Eel River (breeding?); CA/Monterey Bay-Elkhorn Slough (1896, Center for Aquatic Resource Studies 2006, marine migrants)
Vectors
| Level | Vector |
|---|---|
| Probable | Fisheries Intentional |
Regional Impacts
| Economic Impact | Fisheries | |
| By 1874, American Shad were abundant enough to support a small fishery in San Francisco Bay, and from 1900 to 1945, catches frequently exceeded 1 million pounds. Catches decreased in the 1950s, and the commercial fishery was banned in 1957. The sport fishery continues, by dipnet and fly-fishing (Smith 1896; Cohen and Carlton 1995). | ||