| Impact ID | 6832 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | Rudd (Scardinius erythrophthalmus) populations have been forced to move to other habitats while having a large decline in abundance because of high competition with roach (Rutilus rutilus). |
| Reference | 33570 |
| Cost | |
| Location | Ireland |