| Impact ID | 3612 |
| Impact Type | Competition |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | This agressive nature probably allows them to occupy optimal sites among
rocks and to defend spawning sites, thus preventing native species access
to prime areas. |
| Reference | 633 |
| Great Lakes Region | Yes |
| Cost | |
| Location | |
