| Land | Observationsplats | Införda | År | Qualitative Value | Ref. |
|---|---|---|---|---|---|
| Hong Kong | Mirs Bay, Tolo Channel, and Tolo Harbour | 1995 - 1995 | rare | 126271 | |
| New Zealand | East Coast of the South Island | 1991 - 1996 | very common | 58461 | |
| New Zealand | East Coast of the South Island | 1996 - 1999 | very common | 58461 |