Invasion
Invasion Description
Tehama/CA/Sacramento River (1871, Shebley 1917; Cohen and Carlton 1995; Dill and Cordone 1997)
Geographic Extent
Tehama/CA/Sacramento River (1871, Shebley 1917; Cohen and Carlton 1995; Dill and Cordone 1997); CA/Sacramento San Joaquin drainage, Delta and San Francisco Bay (Baywide), breeding populations and adult 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). | ||