| Specimen ID | 116444 |
| Group | Mollusks-Bivalves |
| Genus | Dreissena |
| Species | polymorpha |
| Common Name | zebra mussel |
| Country | Canada |
| State | ON |
| Locality | Lake Simcoe, found on a boat at a marina in Keswick, Ontario, Canada |
| Mapping Accuracy | Accurate |
| HUC8 Name | Severn River-Lake Simcoe |
| HUC8 Number | 04220003 |
| HUC10 Name | Severn River-Lake Simcoe |
| HUC10 Number | 0422000300 |
| HUC12 Name | Severn River-Lake Simcoe |
| HUC12 Number | 042200030000 |
| Map | |
| Collection Day | 5 |
| Collection Month | 11 |
| Collection Year | 1991 |
| Year Accuracy | Actual |
| Potential Pathway | shipping |
| Status | established |
| Comments | A sample of 40 was collected by OMNR, about 100 were counted on the boat. Marina personnel counted 400-500 originally on the boat. A rope sampler and veliger pumping near the marina showed no mussels. |
| Record Type | Personal communication |
| Disposal | 85% isopropanol |
| Museum Cat Number | Lake Simcoe Fish. Assess. |
| Verifier | MAWSA Inc., 381 Elmira Road, Guelph, Ont. N1K 1H3 |
| Freshwater/Marine | Freshwater |
| Number Collected | 40 |
| Year Class | adult |
| Size | 10.9 mm avg. |
