| Country | Locality | Introduced | Year | Qualitative Value | Ref. |
|---|---|---|---|---|---|
| Portugal | Alcochete, Tagus Estuary | 1995 - 1996 | very common | 74754 | |
| Portugal | Óbidos Lagoon | 1993 - 1994 | abundant | 74793 | |
| Portugal | Vila Franca de Xira, Tagus Estuary | 1995 - 1996 | extremely abundant | 74754 |