| Impact ID | 6692 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | A study carried out in the Hungarian reaches of the Danube found that previously widespread Proterorhinus marmoratus populations were drastically reduced in the presence of Neogobius fluviatilis and N. melanostomus. |
| Reference | 35811 |
| Cost | |
| Location | Danube River, Hungary |