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Lake Creek Chinook Salmon Performance Measures
Paul Kucera and Chris Beasley
Nez Perce Tribe/HDR FishPro
Purpose
3. Compare variation between the female per redd derived measure using abundance and redd count expansions
1. Present data to examine variation between adult salmon abundance data and redd count expansions
2. Compare variation between the juvenile per female derived
measure using abundance and redd count expansions
Adult Abundance Project Goal:Accurately assess the spring and summer chinook salmon spawning migration in the Secesh River and Lake Creek on an annual basis (Escapement)
Lake Creek Monitoring Projects
Juvenile Abundance Project Goal:Determine chinook life history characteristics andestimate pre-smolt and smolt populations (ISS)
Adult Abundance MonitoringLake Creek (Video)
Flow
Juvenile Abundance Monitoring
Adult Salmon AbundanceLake Creek
5286
325
697
410490
0
100
200
300
400
500
600
700
800
1998 1999 2000 2001 2002 2003
Year
Num
ber
of F
ish
Abundance Data
Purpose is to Provide:
• Population Census
• Population Estimate
Idaho Chinook Salmon Redd Counts
Purpose is to Provide:
• Index of Relative Abundance
• Trend Information
Are one time index area counts conducted after the peak of spawning
-100
-50
0
50
100
150
0 200 400 600 800
Video Abundance
% D
iffe
ren
ce B
etw
een
A
bu
nd
ance
an
d R
edd
E
xpan
sio
ns
Peak Index ReddExpansion
Multiple Pass IndexRedd Expansion
Extensive Area ReddExpansion
Adult Salmon Abundanceversus
Redd Count Expansion Data
Adult Salmon Abundanceversus
Redd Count Expansion Data
0
100
200
300
400
500
600
700
800
1997 1998 1999 2000 2001 2002 2003 2004
Year
Nu
mb
er o
f F
ish
Abundance
Peak Index ReddExpansion
Multiple Pass IndexRedd Expansion
Extensive Area ReddExpansion
Juvenile per Female DataAbundance Data vs. Redd Count Expansion
-100
-50
0
50
100
150
200
250
300
1997 1998 1999 2000 2001 2002 2003
Year
% D
iffe
ren
ce i
n J
uve
nil
es p
er
Fem
ale
fro
m R
edd
Exp
ansi
on
Peak index reddexpansion -juveniles/femaleExtensive area reddexpansion - juveniles/redd
Female per Redd DataAbundance Data vs. Redd Count Expansion
-60-40-20
020406080
100120140
1997 1998 1999 2000 2001 2002 2003 2004
Year
% D
iffe
ren
ce i
n F
emal
es p
er
Red
d f
rom
Red
d E
xpan
sio
n
Peak index reddexpansion - females/reddExtensive area reddexpansion - females/redd
-100
-50
0
50
100
150
200
250
0 200 400 600 800 1000 1200
Weir Abundance
Per
cen
t D
iffe
ren
ce o
f R
edd
E
xpan
sion
s
Peak Index ReddExpansion
Multiple Pass IndexRedd Expansion
Extensive Area ReddExpansion
Adult Salmon Abundanceversus
Redd Count Expansion DataJohnson Creek
Summary
• Compared adult salmon abundance data with redd count expansion abundance estimates
• Redd count expansion abundance estimates were highly variable and not consistently biased (video)
• Redd count expansion abundance estimates were highly variable and not consistently biased (mark recap)
Primary Measures:
Summary
• Juvenile per female estimates were highly variable at low population size (-55% fewer to 238% greater)
• Juvenile per female estimates were less variable (- 21% to + 25%) at larger population size
• Female per redd estimates were highly variable at low population size (-35% to + 122%) and not consistently biased
• Female per redd estimates were less variable at larger population size (- 2% to + 27%)
Derived Measures:
Summary
• Redd count expansion techniques can provide highly variable estimates of adult abundance
• Redd counts are not a viable method in RM&E study designs for addressing abundance based Tier 2 or Tier 3 questions
• Alternative statistical analysis should be employed to determine if redd counts can be utilized given inherent variation and precision questions
• Consider alternative sampling designs or methods to obtain adult abundance information
CSMEP Application:
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