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: