Northern Pikeminnow Management Northern Pikeminnow Management ProgramProgram
Project 199907700
CooperatorsCooperators
BPABPA
WDFWWDFW
ODFWODFW
PSMFCPSMFC
OutlineOutline
• BackgroundBackground
• Fisheries / HarvestFisheries / Harvest
• EvaluationEvaluation
• What’s NewWhat’s New
• AccomplishmentsAccomplishments
0102030405060708090
Poe et al. 1991 Beamesderfer andRieman 1991
Rieman et al. 1991
Per
cen
t (%
)
NPM SMB WAL
Losses to predationDiet,
salmonids Population
BackgroundBackgroundJOHN DAY RESERVOIR (1983-86)
John Day Reservoir (continued)John Day Reservoir (continued)
Northern pikeminnow predation increased with sizeNorthern pikeminnow predation increased with size
BackgroundBackground
Lower Columbia Reservoirs = 325%Lower Columbia Reservoirs = 325%
Predation Relative to John Day ReservoirPredation Relative to John Day Reservoir
Lower Snake River Reservoirs = 40%Lower Snake River Reservoirs = 40%
Below Bonneville Dam = 800%Below Bonneville Dam = 800%
Loss to Predation = 8% of PopulationLoss to Predation = 8% of Population
SYSTEM-WIDE (1990-92)SYSTEM-WIDE (1990-92)
Assumes no compensation by remaining Assumes no compensation by remaining predators: abundance, growth, fecundity, age predators: abundance, growth, fecundity, age structure, et al.structure, et al.
BackgroundBackground
10-20% Exploitation = 50% Reduction in Predation10-20% Exploitation = 50% Reduction in Predation
Fisheries implemented systemwide in 1991Fisheries implemented systemwide in 1991
Priest Rapids Dam
Hell’s Canyon Dam
Program Area
Fishery Implementation and Fishery Implementation and HarvestHarvest
Northern Pikeminnow FisheriesNorthern Pikeminnow Fisheries
Sport Reward (WDFW)Sport Reward (WDFW)1991-Present1991-Present
Dam Angling (ODFW, CRITFC, et al.)Dam Angling (ODFW, CRITFC, et al.)1991-20021991-2002
Gill Net (CRITFC, YIN, et al.)Gill Net (CRITFC, YIN, et al.)1994-2002 1994-2002
Sport Reward Harvest, 1991-2005
0
50
100
150
200
250
300
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
Year
Harv
est
(in
thousa
nds)
Sport Reward Effort, 1991-2005
0102030405060708090
100
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
Year
0
2
4
6
8
10
12
CP
UE
An
gle
r D
ays (
in
thou
san
ds)
ReservoirReservoir HarvestHarvest ReservoirReservoir HarvestHarvestBelow Below
BonnevilleBonneville 87,57587,575 Ice HarborIce Harbor 1,7321,732
BonnevilleBonneville 55,09755,097 Lower Lower MonumentalMonumental 1,9831,983
The DallesThe Dalles 30,15330,153 Little GooseLittle Goose 33,82833,828
John DayJohn Day 328328 Lower GraniteLower Granite 12,07312,073
McNaryMcNary 18,58818,588
2005 Sport Reward Harvest by Reservoir
FamilyFamilyCatchCatch
((NN = 96,790) = 96,790)
HarvestHarvest
((NN = 10,964) = 10,964)
% Acipenseridae 7.2 1.4
% Catostomidae 2.9 2.0
% Centrarchidae 20.2 14.5
% Clupeidae 0.8 1.8
% Cottidae 2.6 2.6
% Cyprinidae 54.7 55.8
% Ictaluridae 7.3 11.9
% Percidae 2.1 8.5
% Percopsidae <0.1 <0.1
% Pleuronectidae 0.7 0.4
% Salmonidae 0.7 0.6
Sport Reward Incidental Catch, 2005Sport Reward Incidental Catch, 2005
EvaluationEvaluation
02468
101214161820
'91 '92 '93 '94 '95 '96 '97 '98 '99 '00 '01 '02 '03 '04 '05
Year
Ex
plo
ita
tio
n R
ate
(%
)Northern Pikeminnow Exploitation,Northern Pikeminnow Exploitation,Sport Reward Sport Reward ((>> 250 mm FL), 1991-2005 250 mm FL), 1991-2005
60
70
80
90
100
'91 '92 '93 '94 '95 '96 '97 '98 '99 '00 '01 '02 '03 '04 '05
Year
Po
ten
tia
l P
red
ati
on
Predation Relative to Pre-NPMPPredation Relative to Pre-NPMP
78%
Northern PikeminnowNorthern Pikeminnow
Compensation?Compensation?
WalleyeWalleye
Abundance, density, age, Abundance, density, age, growth, fecundity, growth, fecundity, consumption, conditionconsumption, condition
Smallmouth BassSmallmouth Bass
NoNo
MaybeMaybe
NoNo
CP
UE
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Tagging Catch Per Unit Effort by Year
Northern Pikeminnow Electrofishing Catch Rates, John Day Reservoir
FamilyFamilyNorthern Northern
pikeminnowpikeminnow((NN = 291) = 291)
Smallmouth bassSmallmouth bass
((NN = 364) = 364)
% Salmonidae% Salmonidae 69.769.7 20.720.7
% Cottidae% Cottidae 10.010.0 53.053.0
% Clupeidae% Clupeidae 8.88.8 0.90.9
% Cyprinidae% Cyprinidae 3.23.2 7.27.2
% Catostomidae% Catostomidae 0.00.0 6.36.3
% Cobitidae% Cobitidae 0.20.2 0.00.0
% Ictaluridae% Ictaluridae 0.00.0 1.61.6
% Percopsidae% Percopsidae 0.00.0 1.91.9
% Gasterosteidae% Gasterosteidae 7.57.5 4.94.9
% Centrachidae% Centrachidae 0.60.6 3.03.0
% Percidae% Percidae 0.00.0 0.50.5
Diet Composition (samples with identifiable fish), Diet Composition (samples with identifiable fish), Columbia and Snake Rivers, 1999, 2004-2005Columbia and Snake Rivers, 1999, 2004-2005
SMB Consumption Index – John Day SMB Consumption Index – John Day ForebayForebay
Year
Co
nsu
mp
tion
In
de
x
0.0
0.2
0.4
0.6
0.8
Spring Summer
Freq
uenc
y (%
)
0
10
20
30
40
Age 4Age 5
Age 4 and 5 SMB, Below Bonneville Dam
Recent Changes and Plans for 2006Recent Changes and Plans for 2006
• Institutionalize Reward StructureInstitutionalize Reward Structure• Rolling Biological IndexingRolling Biological Indexing• Re-institute Dam AnglingRe-institute Dam Angling• Update Predation ModelUpdate Predation Model• Multi-year Exploitation RatesMulti-year Exploitation Rates • Addition of Two Sport-reward StationsAddition of Two Sport-reward Stations
NPMP Accomplishments, 1991-2005
• Over 2.7 million Northern Pikeminnow Removed
• Low Impact to Resident / Anadromous Species
• >10% Exploitation Achieved in 13 of 15 Years
• Estimated 22% Reduction in Salmonid Predation
• Compensation by Remaining Predators Minimal
• Credible Science: ~30 Journal Articles Published
• Cost Effective
Top Related