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Trap Count Statistics
These data are compiled by the Department of Marine Resources (DMR) using fishway counts provided by agencies, power companies, and a harvester. "NC" indicates a species is not counted at that location. Fish returns should be considered as provisional.
These fish counting facilities are typically operated from May through early November each year. Staff update the statewide trap catch summary weekly or more often during the peak of the fish migrations. The statewide trap catch table includes counts of sea-run salmon captured on Maine rivers and salmon removed from the river as broodstock for restocking of Maine rivers and DOES NOT include captures of aquaculture strays or captive reared adult salmon released from Federal hatcheries.
Historical annual data for 2011 – 2021 (PDF file, 4 pages)
| River | Trap Location | Am.Shad | At.Salmon (MSW) | At.Salmon (grilse) | River Herring | Striped Bass | Sea Lamprey | Trap Opened | Trap Closed | Updated |
|---|---|---|---|---|---|---|---|---|---|---|
| Androscoggin | Brunswick | 0 |
0 |
0 |
5249763 |
0 |
40 |
April 29 |
0 |
May 16, 2022 |
| Aroostook | Tinker Dam | NC |
1 |
0 |
NC |
NC |
NC |
July 2 |
October 22, 2021 | |
| Kennebec | Benton Falls | 7 |
0 |
0 |
3537557 |
2 |
17 |
October 31 |
November 8, 2021 | |
| Kennebec | Lockwood Dam | 0 |
0 |
0 |
5124 |
0 |
0 |
May 1 |
0 |
May 16, 2022 |
| Narraguagus | Cherryfield | 508 |
16 |
5 |
NC |
0 |
0 |
April 30 |
October 28, 2021 | |
| Penobscot | Milford fish lift | 887 |
32 |
0 |
846725 |
0 |
2220 |
April 15 |
May 16, 2022 | |
| Penobscot | Orono | 0 |
0 |
0 |
84696 |
0 |
0 |
April 15 |
May 16, 2022 | |
| Penobscot | Weldon Dam | NC |
NC |
NC |
NC |
NC |
NC |
April 28 |
May 16, 2022 | |
| Saco | Cataract (East + West Channels) | 0 |
0 |
0 |
0 |
0 |
0 |
April 29 |
May 9, 2022 | |
| Saco | Skelton | 0 |
0 |
0 |
0 |
0 |
0 |
April 29 |
May 9, 2022 | |
| St. Croix | Milltown Dam | 40 |
0 |
0 |
549847 |
0 |
1 |
April 14 |
July 11, 2021 | |
| Union | Ellsworth | 0 |
0 |
0 |
401085 |
0 |
0 |
May 1 |
May 16, 2022 |
Atlantic salmon MSW = multi sea winter (≥ 63 cm fork length);
grilse = one sea winter (< 63 cm fork length)
River herring counts = combined count of alewife and blueback herring
| River | Trap Location | Sources and Details |
|---|---|---|
| Androscoggin | Brunswick | Counts conducted by DMR and Brookfield Renewable Energy Group. |
| Aroostook | Tinker Dam | Counts provided by Algonquin Power. |
| Kennebec | Benton Falls | Counts conducted by DMR. |
| Kennebec | Lockwood Dam | Counts provided by Brookfield Renewable Energy Group. |
| Narraguagus | Cherryfield | Counts provided by MDMR. River herring and small bodied(<40 cm in total length) American shad are able to escape the Narraguagus trap. |
| Penobscot | Milford fish lift | Due to trap operations grilse will be added to the MSW counts. Counts provided by MDMR |
| Penobscot | Orono | Counts provided by Brookfield Renewable Energy Group. |
| Penobscot | Weldon Dam | Counts provided by Brookfield Renewable Energy Group. River herring were documented in the fishway, but no counts are provided. |
| Saco | Cataract (East + West Channels) | Counts provided by Brookfield Renewable Energy Group. West Channel:0 river herring & 0 American shad |
| Saco | Skelton | Counts provided by Brookfield Renewable Energy Group. |
| St. Croix | Milltown Dam | Counts provided by St. Croix International Waterway Commission. |
| Union | Ellsworth | Counts provided by Brookfield Renewable Energy Group. |
Atlantic Salmon Trap Protocols (PDF file, 44 pages)
Atlantic Salmon Aquaculture Escape Protoco (PDF file, 17 pages)
