| Impact ID | 7804 |
| Impact Type | Competition |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | Brown trout (Salmo trutta) and rainbow trout (Oncorhynchus mykiss) were deemed, at least partially, responsible for the extirpation of Arctic grayling (Thymallus arcticus) half a century ago in Michigan, its only known location in the Great Lakes basin. |
| Reference | 16494 |
| Cost | |
| Location | Great Lakes, USA |