n = 11
| Year / Period |
From |
To |
Established |
Ecological effects |
|
unknown |
unknown |
Austria |
yes |
unknown |
|
unknown |
unknown |
France |
yes |
unknown |
|
unknown |
unknown |
Poland |
yes |
unknown |
|
unknown |
unknown |
USSR, Former Area of |
yes |
unknown |
|
1950 - 1959 |
Not specified |
Belgium |
probably no |
unknown |
|
1890 |
Northeast America. |
Inland waters. |
unknown |
yes |
|
1890 |
United States of America |
Germany |
yes |
unknown |
|
1937 |
France |
Morocco |
yes |
unknown |
|
1968 |
Belgium |
Netherlands |
probably yes |
unknown |
|
1973 |
Not specified |
Switzerland |
probably yes |
|
|
1997 |
Poland |
Belarus |
probably yes |
|