| Impact ID | 9779 |
| Impact Type | Disease/Parasite/Toxicity |
| Study Type | Experimental |
| Study Location | Laboratory |
| Impact Description | Gammarus fasciatus is one of the hosts for the nematode Cosmocephalus obvelatus, which infects the esophagus of gulls. |
| Reference | 16897 |
| Cost | |
| Location | Lake Ontario |