Anadromous fish passing upstream through the Holyoke Fish lift are identified and counted during the spring and early summer migration season. Continuous counts are collected and can be found here during the season. Also, see historical fish counts from the Fishway.
For updates on fish counts visit US Fish & Wildlife Service.
Fish Counts: 2022
| Species | Total |
| American Shad | 190,352 |
| Blueback Herring | 283 |
| Gizzard Shad | 63 |
| Striped Bass | 314 |
| Sea Lamprey | 22,233 |