| Impact ID | 3305 |
| Impact Type | Disease/Parasite/Toxicity |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | More than 20,000 Cyprinus carpio were killed by a bacterial disease over a short period of time in the Merrimack River in the late 1970s. |
| Reference | 1739 |
| Cost | |
| Location | Merrimack River, Massachusetts, USA |