| Impact ID | 6837 |
| Impact Type | Competition |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | After the introduction of roach (Rutilus rutilus) to Lake Erne, the rudd (Scardinius erythrophthalmus) disappeared. |
| Reference | 33374 |
| Cost | |
| Location | Lake Erne, Ireland |