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.

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
32
1
0
179075
5
30
April 23
November 1
November 4, 2018
Aroostook Tinker Dam
NC
39
0
NC
NC
NC
July 3
November 9
November 9, 2018
Kennebec Benton Falls
8
0
0
3,350,000
0
3
May 1
May 25, 2018
Kennebec Lockwood Dam
401
8
3
300390
102
8
May 9
October 31
November 4, 2018
Narraguagus Cherryfield
557
20
22
NC
0
0
May 1
October 26
October 26, 2018
Penobscot Milford fish lift
3923
467
288
2174688
762
1976
April 19
November 15
November 12, 2018
Penobscot Orono
6
13
1
93939
0
251
April 15
November 15
November 12, 2018
Penobscot Weldon Dam
0
6
10
0
0
NC
May 1
November 12
November 12, 2018
Saco Cataract (East + West Channels)
3985
2
1
86512
479
0
May 1
October 1, 2018
Saco Skelton
93
0
0
44424
0
0
May 1
October 1, 2018
St. Croix Milltown Dam
255
0
0
270659
0
0
April 26
July 18, 2018
Union Ellsworth
0
0
0
622829
0
0
May 3
November 1
November 12, 2018

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 River herring and small bodied(<40 cm in total length) American shad are able to escape the Narraguagus trap.
Penobscot Milford fish lift Counts provided by Brookfield Renewable Energy Group.
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:18,434 river herring & 571 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

Atlantic Salmon Aquaculture Escape Protocols