| Ekosistem | Type | Status | Acuan |
|---|---|---|---|
| Antainambalana | River (basin) | native | 33664 |
| Bemarivo | River (basin) | native | 33664 |
| Canal des Pangalanes | River (basin) | native | 33664 |
| Ethiopian | Zoogeographic realm | endemic | 3509 |
| Great Fish | River (basin) | misidentification | 188 |
| Mahavavy Sud | River (basin) | questionable | 33664 |
| Maningory | River (basin) | native | 33664 |