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TRANSCRIPT
A tool for understanding likely fish passage and harvest management
outcomes for alewife on the St. Croix River Betsy Barber1, Joseph Zydlewski2,1, Jamie Gibson3
Acknowledgements:
Excretion
Gametes
Carcasses
Nutrient Sources
1University of Maine, Department of Wildlife, Fisheries, and Conservation Biology, Orono, ME; 2U.S. Geological Survey, Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono, ME; 3Fisheries and Oceans Canada, Dartmouth, NS, Canada
Time Factor
ME NB
Unit 3
Unit 4
Unit 2
Unit 1
% Spawning Habitat: 4: 60% 3: 38% 2: 2%
1: <1%
ME
0
Ch
ange
in n
utr
ien
ts
Spring Fall
Adults
Juveniles
Net Flow
+
-
Low per capita reproductive rate
High per capita reproductive rate
Spawner-Recruit Curve
1 8 7 6 5 4 3 2
Spawning Migration
Marine
Freshwater
Ocean Age Classes
Eggs
YOY Nutrients
Input
Export
2) Location of
Commercial
Fishery
1) Changes in
Passage
Efficiency at Dams
Dam 1
Dam 2
Dam 3
Dam 4
Estuary
4
1
2
3
Adult Upstream Passage (%)
0 100 50
Juvenile Downstream Passage (%)
0 100 50
Adult Upstream Passage (%)
0 100 50
Juvenile Downstream Passage (%)
0 100 50
Dam 1 Dam 2
Data Inputs Model Development Interactive Web Application
Address Management Questions:
1) Changes in Passage Efficiency at Dams
2) Location of Commercial Fishery
50% Fishery
Estuary
4
1
2
3 50% Fishery
50% Fishery
Vs.
No Fishery
Vs.
Scenario Results
Spaw
ner
Ab
un
dan
ce (
Mill
ion
s)
0
0.5
1.0
1.5
2.0
Year
0 25 50 75 100
Temporal Aspect
Spawning Habitat
Unit 1
Unit 2
Unit 3
Unit 4