St. Stephen Fish Lift
2010 - 2014 Numbers of Fish passed through the St. Stephen's Fish Lift
| Common Name | Scientific Name | 2010 | 2011 | 2012 | 2013 | 2014 |
|---|---|---|---|---|---|---|
| American Shad | Alosa sapidissima | 346,879 |
272,961 |
150,082 |
324,984 |
42,535 |
| Blueback Herring | Alosa aestivalis | 217,750 |
336,210 |
37,117 |
113,860 |
171,200 |
| Striped Mullet | Mugil cephalus | 708 |
6,016 |
266 |
4,437 |
470 |
| Freshwater Catfish | Ictalurus sp. | 722 |
1,065 |
322 |
367 |
23 |
| Striped Bass | Morone saxitalis | 2,760 |
1,640 |
1,488 |
90 |
111 |
| Gizzard shad | Dorosoma cepedianum | 3,049 |
333 |
2 |
101 |
250 |
| Largemouth Bass | Micropterus salmoides | 28 |
74 |
2 |
3 |
23 |
| Longnose Gar | Lepisoteus osseus | 120 |
816 |
185 |
172 |
125 |
| Atlantic Needlefish | Strongylura marina | 27 |
89 |
0 |
1 |
6 |
| Sunfish | Lepomis sp. | 42 |
99 |
20 |
222 |
560 |
| White Perch | Morone americana Ctenopharyngodon idella / Cyprinus carpio | 240 |
63 |
2 |
1 |
1 |
| Carp | Cyprinus carpio | 423 |
172 |
30 |
8 |
2 |
| Sea Lamprey | Petromyzon marinus | 0 |
0 |
0 |
0 |
0 |
| Crappie | Pomoxis sp. | 0 |
12 |
1 |
3 |
3 |
| Bowfin | Amia calva | 49 |
9 |
1 |
0 |
1 |
| Hickory Shad | Alosa mediocris | 0 |
5 |
0 |
0 |
0 |
Total |
572,797 |
619,564 |
189,518 |
444,249 |
215,310 |
|
Fish passage through St. Stephen Fish Lift is variable from year-to-year. This variability is due to environmental factors (the amount of river flow, water temperature, and natural variations in population numbers) and man-made factors (construction and maintenance of the mechanics of the fish lift). From 2012-2014, the operating season was shortened due to major rehabilitation of the hydraulics and structural components of the Fish Lift.
Biologists use multi-year trends and averages to assess anadromous fish runs at St. Stephen Fish Lift to account for the many factors that affect fish passage.