| Impact ID | 6835 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | Perch (Perca fluviatilis) found in the Baltic Sea has been forced to alter behaviors due to competition against roach (Rutilus rutilus). Decrease in fecundity, and growth were observed through several studies comparing the two. |
| Reference | 33562 |
| Cost | |
| Location | Baltic Sea |