| Number seen/Abundance | Date | Location | Comments | Species |
|---|---|---|---|---|
| 1 | 2009-07-21 | River Mersey, Warrington River Mersey, Westy, Warrington. Freshwater section of the river, approx 2.8km upstream of tidal limit. |
Caught by a recreational angler. EA Fisheries Bailiff brought it back to the office for ID. Sex: Male. Size: approx 55mm carapace length (measured from eyes to posterior edge). First confirmed record for the River Mersey. | Eriocheir sinensis |