| Main Ref. | Grosholz, E. and G. Ruiz, 1996 |
| To | San Francisco Bay, California |
| FAO area | Pacific, Eastern Central |
| From | Europe |
| FAO area | Atlantic, Northeast |
| Year | |
| Range | 1989 - 1990 |
| Period | 1975-present |
| Established in the Wild | yes, self reproducing |
| Established in Aquaculture | |
| Significant Ecological Interactions | |
| Significant Socio-economic Effects | |
| Introduced by | |
| Reason | unknown |
| Other Reason | |
| Comments | In 1993 it started spreading to other locations such as Bodega Harbor and Elkhorn Slough. |