| Main Ref. | Bartley, D.M. (comp./ed.), 2006 |
| To | Germany |
| FAO area | Atlantic, Northeast |
| From | unknown |
| FAO area | |
| Year | |
| Range | |
| Period | unknown |
| Established in the Wild | probably yes |
| Established in Aquaculture | |
| Significant Ecological Interactions | unknown |
| Significant Socio-economic Effects | |
| Introduced by | unknown |
| Reason | ornamental |
| Other Reason | |
| Comments | Introduced for the aquarium trade but a few semi-wild populations now exist in ponds. |