| Impact ID | 9786 |
| Impact Type | Competition |
| Study Type | Experimental |
| Study Location | Field |
| Impact Description | Gammarus fasciatus has been replaced by the invasive Echinogammarus ischnus throughout the lower Great Lakes. E. ischnus was observed preying on juvenile G. fasciatus. |
| Reference | 43388 |
| Cost | |
| Location | St. Lawrence River |