Trap Count Statistics

Introduction

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 past 11 years (PDF file)

Recent Trap Counts for Fish Returns to Maine by River
River Trap Location
Am.Shad
At.Salmon (MSW)
At.Salmon (grilse)
River Herring
Striped Bass
Sea Lamprey
Trap Opened
Trap Closed
Updated
Androscoggin Brunswick
550
1
3
54906
2
345
April 30
October 18, 2021
Aroostook Tinker Dam
NC
0
0
NC
NC
NC
July 2
October 15, 2021
Kennebec Benton Falls
7
0
0
3537557
2
17
October 15, 2021
Kennebec Lockwood Dam
92
15
8
66009
64
18
May 1
October 18, 2021
Narraguagus Cherryfield
508
15
4
NC
0
0
April 30
October 18, 2021
Penobscot Milford fish lift
11581
554
1731496
54
5776
April 15
October 18, 2021
Penobscot Orono
2
8
0
221657
0
793
April 15
October 18, 2021
Penobscot Weldon Dam
NC
NC
NC
NC
NC
NC
October 18, 2021
Saco Cataract (East + West Channels)
2582
0
0
135198
76
0
April 30
July 11, 2021
Saco Skelton
130
0
0
118566
0
0
April 30
July 11, 2021
St. Croix Milltown Dam
40
0
0
549847
0
1
April 14
July 11, 2021
Union Ellsworth
2
0
0
768015
0
0
May 1
October 18, 2021

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

Data Sources and Details
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)