Middle Fork American River ProjectMiddle Fork American River Project
AQ 2 – Fish Population AQ 2 – Fish Population Technical Study Report Technical Study Report
2007 -20082007 -2008Overview Overview
March 3, 2009March 3, 2009
2
Study ObjectivesStudy Objectives Document fish species composition, Document fish species composition,
distribution, and abundance in the Project distribution, and abundance in the Project bypass and peaking reaches. bypass and peaking reaches.
Characterize fish growth, condition factor, Characterize fish growth, condition factor, and population age structure in the Project and population age structure in the Project bypass and peaking reaches.bypass and peaking reaches.
Characterize fish species composition, Characterize fish species composition, relative abundance, and size in Project relative abundance, and size in Project reservoirs and diversion pools.reservoirs and diversion pools.
3
AQ 2 – Fish PopulationAQ 2 – Fish PopulationStudy Elements and ReportsStudy Elements and Reports
Study Objectives
Document fish species composition, distribution, and abundancein the bypass and peaking reaches.
Characterize fish growth, condition factor, and population age structurein the bypass and peaking reaches.
Characterize fish species composition, relative abundance, and sizein Project reservoirs and diversion pools.
Conduct 2007 Field Surveys
ConductReservoirSampling
ConductDiversion Pool
Sampling
Document 2007 findings in this Fish Population Report
Complete 2008 Fish Population Field Studies
Document 2008 Fish Population Results in Fish Population Report (2009)
ConductRiver
Sampling
Conduct SpecialPurpose Qualitative
Sampling
Consult with Aquatic TWG
Determine whichSites will be
Sampled in 2008
Identify Appropriate River Fish Standing Crop
Comparison Datasets
Consult with Aquatic TWG
Determine if AdditionalSampling is Needed in 2009
Complete 2009 Fish Population Contingency Field Studies
Document 2009 Fish Population Results in Fish Population Report (2010)
4
Study ImplementationStudy Implementation
After reviewing the 2007 study results, the After reviewing the 2007 study results, the Aquatic TWG identified a set of river study Aquatic TWG identified a set of river study sites to sample in 2008 to augment the sites to sample in 2008 to augment the 2007 river sampling results.2007 river sampling results.
5
Fish Population Study SitesFish Population Study Sites 2007 Sites
21 River, 4 Reservoirs, 3 Diversion Pools 2008 Sites
14 River (3 New), Qualitative Hardhead, Ralston Afterbay
6
Fish Population Study SitesFish Population Study Sites2007 River Study 2007 River Study SitesSites
7
Fish Population Study SitesFish Population Study Sites2008 River Study 2008 River Study SitesSites
8
Fish Population Study SitesFish Population Study Sites2008 River Study 2008 River Study SitesSites
Hardhead
Qualitative
Hardhead
Qualitative
Hardhead
Qualitative
Har
dhea
d
Qua
litat
ive
9
Study ReportingStudy Reporting
This report includes 2007 – 2008 results. This report includes 2007 – 2008 results. The 2008 results have been combined with The 2008 results have been combined with
the 2007 study results and the discussion the 2007 study results and the discussion has been updated. has been updated.
10
Study ResultsStudy Results Distribution and DiversityDistribution and Diversity
Reservoirs and RiversReservoirs and Rivers AbundanceAbundance
Reservoirs, Rivers, Ralston AfterbayReservoirs, Rivers, Ralston Afterbay Trout BiomassTrout Biomass Fish Population Comparison SitesFish Population Comparison Sites Fish Size, Age, Growth and Condition Fish Size, Age, Growth and Condition
FactorFactor Timing of FryTiming of Fry OthersOthers
Electrofishing versus SnorkelingElectrofishing versus Snorkeling Small Stream Diversion Pool SamplingSmall Stream Diversion Pool Sampling Species and Lifestage Periodicity ChartSpecies and Lifestage Periodicity Chart Water TemperatureWater Temperature
11
Rivers (2007 & 2008)Rivers (2007 & 2008) Project Bypass and PeakingProject Bypass and Peaking Comparison RiversComparison Rivers Above Small Stream DiversionsAbove Small Stream Diversions
ReservoirsReservoirs 20072007
Hell Hole Reservoir, French Meadows Reservoir, Hell Hole Reservoir, French Meadows Reservoir, Middle Fork Interbay, Ralston AfterbayMiddle Fork Interbay, Ralston Afterbay
20082008 Ralston Afterbay (Sonar, Gill Nets, Ralston Afterbay (Sonar, Gill Nets,
Electrofishng)Electrofishng)
Distribution, Diversity, Abundance, Distribution, Diversity, Abundance, Biomass Data SetsBiomass Data Sets
12
Distribution and DiversityDistribution and Diversity Rivers (Trout and Minnows)Rivers (Trout and Minnows)
Rainbow Trout & Brown Trout
Hardhead
Pikeminnow
California Roach
0 9
Rainbow Trout& Brown Trout
Hardhead
Pikeminnow
California Roach
Rainbow Trout & Brown Trout
Hardhead
Pikeminnow
California Roach
0
Rainbow Trout
Hardhead
Pikeminnow
California Roach
0 5 9
=Present = Uncertain = Survey Site
Middle Fork American River below Ralston Afterbay
Middle Fork American River above Ralston Afterbay
Rubicon RiverLong
Canyon Creek
Duncan Creek
Confluence
36.2 51.8
River Mile
Pilot Creek
South Fork Rubicon
Elicott Bridge
River Mile
6 8.2River Mile
3.5 20.914.25.2 25.7 36.2
44.7
Impassable Barriers
Middle Fork Interbay
3.2
3.1
8.6 9.5
8.55
26.2 30.4
Brushy Canyon
30.5
47.2
French MeadowsReservoir
Volcano Creek
Folsom Reservoir
21 0
North Fork American River
Confluence
4.8 11 14.1 20.9 24.1
Mammoth Bar Canyon Creek
Otter Creek NFMF1
Ralston Afterbay
Dam
Hell Hole Reservoir
Ralston Afterbay
Impassible Barrier
26.4
South Fork Long Canyon
39.7
22.6
4.9
13.3
1.9 3.8
25.9
Ramsey Crossing
8.3 10.0
23.5
13
Hardhead
Pikeminnow
California Roach
0 9
Hardhead
Pikeminnow
California Roach
Hardhead
Pikeminnow
California Roach
0
Rainbow Trout
Hardhead
Pikeminnow
California Roach
0 5 9
0
Rainbow Trout & Brown Trout
=Present = Uncertain = Diversion dam = Survey Site
1NFMF= North Fork of the Middle Fork American River
Long Canyon Creek
Rainbow Trout
North Fork Long Canyon
Long Canyon Creek
6.3
1.3
0 3
Duncan Creek
Mosquito Ridge Road
Rainbow Trout & Brown Trout
Little Duncan Creek
Rainbow Trout
River Mile
2.3 4.2
7.4
River Mile
11
River Mile
3.2
3.1
8.6 9.5
8.55
26.2 30.4
Brushy Canyon
30.5
47.2
French Meadow sReservoir
Volcano Creek
Folsom Reservoir
21 0
North Fork American River
Confluence
4.8 11 14.1 20.9 24.1
Mammoth Bar Canyon Creek
Otter Creek NFMF1
Ralston Afterbay
Dam
Hell Hole Reservoir
Ralston Afterbay
Impassible Barrier
26.4
South Fork Long Canyon
39.7
22.6
4.9
13.3
1.9 3.8
25.9
Ramsey Crossing
8.3 10.0
23.5
Distribution and DiversityDistribution and Diversity Streams (Trout and Minnows)Streams (Trout and Minnows)
14
RBT BNT HH SPM MXD SS SCULP SD CAR SMB GSUN KOK TCB LKT WCF
Fish MF4.8 QUANT ● ● ● ● ●MFAR at RM4.8 QUAL ● ● ●Fish MF14.1 QUANT ● ● ● ●Otter Creek at MF14.1 QUAL ● ● ● ● ● ● ●Gas Canyon QUAL ● ● ●Fish MF23.5 QUANT ● ● ●MFAR at RM23.5 QUAL ● ● ● ● ● ●
Fish MF26.2 QUANT ● ● ● ● ● ● ● ● ●MFAR at RM26.2 QUAL ● ● ● ● ● ● ● ● ●MFAR at RM26.6 QUAL ● ●MFAR at RM29.4 QUAL ● ●
Fish MF36.2 QUANT ● ●Fish MF44.7 QUANT ● ●Fish MF51.8 QUANT ● ●
Rubicon River RM0.0 - 0.5 QUAL ● ● ● ● ● ● ● ●Rubicon at RM3.5 QUAL ● ● ● ● ● ●Fish R3.5 QUANT ● ● ● ● ● ● ● ●Rubicon River at RM5.2 QUAL ● ● ● ● ● ●Rubicon River at RM6.2 QUAL ● ● ● ● ●Rubicon River at RM8.0 QUAL ● ● ● ●Rubicon River at RM9.9 QUAL ● ● ●Rubicon River at RM14.3 QUAL ● ● ●Fish R20.9 QUANT ● ● ●Fish R25.7 QUANT ● ●Fish R36.2 QUANT ● ● ●
LC at RM0.2 QUAL ● ● ● ● ●Fish LC9.0 QUANT ●
Fish NFLC1.9 QUANT ●Fish NFLC3.8 QUANT ●NFLC RM3.6 - 5.0 QUAL ●
Fish SFLC2.3 QUANT ●Fish SFLC4.2 QUANT ●SFLC RM5.7 - 9.4 QUAL ●
Fish D6.3 QUANT ● ●Fish D8.3 QUANT ● ●Fish D9.0 QUANT ● ●Fish D10.0 QUANT ● ●Duncan Creek RM9.0 - 13.6
QUAL ● ●
NFMF at RM0.2 QUAL ● ● ● ● ●Fish NFMF2.3 QUANT ● ● ● ● ● ●
Fish NF18.4 QUANT ● ● ● ●Fish NF31.3 QUANT ● ● ● ● ● ● ●NF at RM31.3 QUAL ● ● ● ● ● ● ● ●Fish NF53.7 QUANT ● ● ● ● ● ● ●
NFLC QUANT drySFLC QUANT ●
Duncan QUANT ● ●
Ralston Gillnetting/e-fishing ● ● ● ● ●Interbay Gillnetting ● ●French Meadow s Gillnetting ● ● ● ●Hell Hole Gillnetting ● ● ● ● ● ●
Diversion Pools
Reservoirs
South Fork Long Canyon Creek
Duncan Creek
North Fork of the Middle Fork American River
North Fork American River
Long Canyon Creek
North Fork Long Canyon Creek
Middle Fork American River Downstream of Ralston Afterbay
Middle Fork American River from Middle Fork Interbay to Ralston Afterbay
Middle Fork American River Upstream of Middle Fork Interbay
Rubicon River
Table AQ 2-4. Summary of Fish Species Observed during the 2007 - 2008 Fish Population Sampling (●).
Study Site Sample Type1Fish Species2
Distribution and DiversityDistribution and Diversity
15
Total Reservoir CPUE
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
French MeadowsReservoir
Middle ForkInterbay
Ralston Afterbay(9/13/07)
Ralston Afterbay(6/26/08)
Ralston Afterbay(9/4/08)
Hell HoleReservoir
CP
UE
(fi
sh
/ h
ou
r)
TCBSPMHHSSRBT, BNT, KOK, LKT
(9/11/07) (9/20/07) (9/10/07)
Abundance ReservoirsAbundance Reservoirs
(Gill Netting)(Gill Netting)
16
Trout Abundance (Rivers 2007)Trout Abundance (Rivers 2007)Trout per Mile
0
1000
2000
3000
4000
5000
6000
7000
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
Nu
mb
er
of
tro
ut
pe
r m
ile
YOY
Adult
Middle Fork American River and North Fork
American River below the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Trout per Acre
0500
10001500200025003000350040004500
NF
18.4
MF
4.8
MF
14.1
MF
26.2
MF
36.2
MF
44.7
MF
51.8
R3.5
R20.9
R25.7
R36.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6.3
D9.0
NF
MF
2.3
NF
31.3
NF
53.7
Num
ber
of
trout
per
acre
YOY
AdultMiddle Fork American River and North Fork
American River below the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Trout Biomass (pounds per acre)
0
20
40
60
80
100
120
NF
18.4
MF
4.8
MF
14.1
MF
26.2
MF
36.2
MF
44.7
MF
51.8
R3.5
R20.9
R25.7
R36.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6.3
D9.0
NF
MF
2.3
NF
31.3
NF
53.7
pounds p
er
acre Middle Fork American
River and North Fork American River below the
ConfluenceRubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Total Biomass (pounds per mile)
050
100150200250300350400
NF
18.4
MF
4.8
MF
14.1
MF
26.2
MF
36.2
MF
44.7
MF
51.8
R3.5
R20.9
R25.7
R36.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6.3
D9.0
NF
MF
2.3
NF
31.3
NF
53.7
pounds p
er
mile
Middle Fork American River and North Fork American River below the
Confluence
Rubicon RiverLong Canyon Creeks
Duncan CreekComparison Rivers
17
Figure AQ 2-3a. The 2007 Density and Biomass of Trout in the Study Streams.
Trout per Mile
0
1000
2000
3000
4000
5000
6000
7000
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
Nu
mb
er
of
tro
ut
per
mil
e YOY
Adult
Middle Fork American River and North Fork American River
below the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Trout per Acre
0
500
1000
1500
2000
2500
3000
3500
4000
4500
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
Nu
mb
er
of
tro
ut
per
acre
YOY
Adult
Middle Fork American River and North Fork American River
below the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Trout Biomass (pounds per acre)
0
20
40
60
80
100
120
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
po
un
ds p
er
acre
Middle Fork American River and North Fork American River
below the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Total Biomass (pounds per mile)
0
50
100
150
200
250
300
350
400
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
po
un
ds p
er
mil
e
Middle Fork American River and North Fork American River below the Confluence
Rubicon River
Long Canyon Creeks
Duncan CreekComparison Rivers
Trout Abundance (Rivers 2007)Trout Abundance (Rivers 2007)
Trout per Mile
0
1000
2000
3000
4000
5000
6000
7000
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
Nu
mb
er
of
tro
ut
per
mil
e YOY
AdultMiddle Fork American River
and North Fork American River below the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Trout per Acre
0
500
1000
1500
2000
2500
3000
3500
4000
4500
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
Nu
mb
er
of
tro
ut
per
acre YOY
Adult
Middle Fork American River and North Fork American River
below the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Trout Biomass (pounds per acre)
0
20
40
60
80
100
120
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
po
un
ds p
er
acre
Middle Fork American River and North Fork American River
below the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Total Biomass (pounds per mile)
0
50
100
150
200
250
300
350
400N
F1
8.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
po
un
ds p
er
mil
e
Middle Fork American River and North Fork American River below the Confluence
Rubicon River
Long Canyon Creeks
Duncan CreekComparison Rivers
Carefull with interpretation..see previous slide for pound per mile
18
Trout Abundance (Rivers 2007)Trout Abundance (Rivers 2007)
(linear estimates only)(linear estimates only)
Trout per Mile
0
1000
2000
3000
4000
5000
6000
7000
NF
18.4
MF
4.8
MF
14.1
MF
26.2
MF
36.2
MF
44.7
MF
51.8
R3.5
R20.9
R25.7
R36.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6.3
D9.0
NF
MF
2.3
NF
31.3
NF
53.7
Num
ber
of tr
out per
mile
YOY
Adult
Middle Fork American River and North Fork American River below
the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Total Biomass (pounds per mile)
0
50
100
150
200
250
300
350
400
NF
18.4
MF
4.8
MF
14.1
MF
26.2
MF
36.2
MF
44.7
MF
51.8
R3.5
R20.9
R25.7
R36.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6.3
D9.0
NF
MF
2.3
NF
31.3
NF
53.7
pounds
per
mile
Middle Fork American River and North Fork American River below the
Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
19
2007 Duncan Creek Data Sheet 2007 Duncan Creek Data Sheet ErrorErrorTrout per Mile
0
1000
2000
3000
4000
5000
6000
7000
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
Nu
mb
er o
f t
ro
ut p
er m
ile
YOY
AdultMiddle Fork American River
and North Fork American River below the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Trout per Acre
0
500
1000
1500
2000
2500
3000
3500
4000
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
Nu
mb
er o
f t
ro
ut p
er a
cre
YOY
Adult
Middle Fork American River and North Fork American River
below the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Trout Biomass (pounds per acre)
0
10
20
30
40
50
60
70
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
po
un
ds
pe
r a
cre
Middle Fork American River and North Fork American River
below the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Total Biomass (pounds per mile)
0
50
100
150
200
250
300
350
400
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
po
un
ds
pe
r m
ile
Middle Fork American River and North Fork American River below the Confluence
Rubicon River
Long Canyon Creeks
Duncan CreekComparison Rivers
Figure AQ 2-3a. The 2007 Density and Biomass of Trout in the Study Streams.
Trout per Mile
0
1000
2000
3000
4000
5000
6000
7000
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
Nu
mb
er o
f tro
ut p
er m
ile
YOY
AdultMiddle Fork American River
and North Fork American River below the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Trout per Acre
0
500
1000
1500
2000
2500
3000
3500
4000
4500
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
Nu
mb
er o
f tro
ut p
er acre
YOY
Adult
Middle Fork American River and North Fork American River
below the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Trout Biomass (pounds per acre)
0
20
40
60
80
100
120
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
po
un
ds p
er acre
Middle Fork American River and North Fork American River
below the Confluence
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Total Biomass (pounds per mile)
0
50
100
150
200
250
300
350
400
NF
18
.4
MF
4.8
MF
14
.1
MF
26
.2
MF
36
.2
MF
44
.7
MF
51
.8
R3
.5
R2
0.9
R2
5.7
R3
6.2
LC
9.0
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
NF
MF
2.3
NF
31
.3
NF
53
.7
po
un
ds p
er m
ile
Middle Fork American River and North Fork American River below the Confluence
Rubicon River
Long Canyon Creeks
Duncan CreekComparison Rivers
2007 Report2008 Report Correction
Error found during 2008 resampling:
17’ not 171 (also analysist swapped length and width in 2007 “recognizing” length should be longer than the width)
20
Trout Abundance (Rivers 2008)Trout Abundance (Rivers 2008)Trout per Mile
0
1000
2000
3000
4000
5000
6000
7000
MF
4.8
MF
14
.1
MF
23
.5
MF
26
.2
MF
44
.7
R2
0.9
SF
LC
2.3
SF
LC
4.2
D6
.3
D8
.3
D9
.0
D1
0.0
NF
MF
2.3
NF
53
.7
Nu
mb
er
of
tro
ut
pe
r m
ile
YOY
Adult
Middle Fork American River Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Trout per Acre
0500
10001500200025003000350040004500
MF
4.8
MF
14
.1
MF
23
.5
MF
26
.2
MF
44
.7
R2
0.9
SF
LC
2.3
SF
LC
4.2
D6
.3
D8
.3
D9
.0
D1
0.0
NF
MF
2.3
NF
53
.7
Nu
mb
er
of
tro
ut
pe
r a
cre
YOY
Adult
Middle Fork American River Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Total Biomass (pounds per mile)
050
100150200250300350400
MF
4.8
MF
14
.1
MF
23
.5
MF
26
.2
MF
44
.7
R2
0.9
SF
LC
2.3
SF
LC
4.2
D6
.3
D8
.3
D9
.0
D1
0.0
NF
MF
2.3
NF
53
.7
po
un
ds p
er
mile
Middle Fork American River
Rubicon RiverLong Canyon Creeks
Duncan CreekComparison Rivers
Total Biomass (pounds per acre)
0
20
40
60
80
100
120
MF
4.8
MF
14
.1
MF
23
.5
MF
26
.2
MF
44
.7
R2
0.9
SF
LC
2.3
SF
LC
4.2
D6
.3
D8
.3
D9
.0
D1
0.0
NF
MF
2.3
NF
53
.7
po
un
ds p
er
acre
Middle Fork American River
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
21
Trout Abundance (Rivers 2008)Trout Abundance (Rivers 2008)
(linear estimates only)(linear estimates only)
Trout per Mile
0
1000
2000
3000
4000
5000
6000
7000
MF
4.8
MF
14.1
MF
23.5
MF
26.2
MF
44.7
R20
.9
SF
LC2.
3
SF
LC4.
2
D6.
3
D8.
3
D9.
0
D10
.0
NF
MF
2.3
NF
53.7
Num
ber
of tr
out p
er m
ile YOY
Adult
Middle Fork American River
Rubicon River
Long Canyon Creeks
Duncan Creek
Comparison Rivers
Total Biomass (pounds per mile)
0
50
100
150
200
250
300
350
400
MF
4.8
MF
14.1
MF
23.5
MF
26.2
MF
44.7
R20
.9
SF
LC2.
3
SF
LC4.
2
D6.
3
D8.
3
D9.
0
D10
.0
NF
MF
2.3
NF
53.7
poun
ds p
er m
ile
Middle Fork American River
Rubicon RiverLong Canyon Creeks
Duncan CreekComparison Rivers
22
Study Wide (2007-2008) 127 Hardhead
90% < 6”, 95% from Ralston Afterbay 217 Pikeminnow
95% < 6”, 56% from Ralston Afterbay Ralston Afterbay
>1000 per mile of shoreline (3 miles of shoreline) Majority were 80-150 mmMajority were 80-150 mm
River Sites Overall very few observed at river sites (patchy
distribution) Bypass Reaches—Majority just upstream of Ralston in
Rubicon River Peaking Reach—Few locations (e.g., Otter Creek, Horseshoe
Bar) Comparison Reaches—Patchy distribution
Hardhead/Pikeminnow AbundanceHardhead/Pikeminnow Abundance
23
Hardhead/Pikeminnow AbundanceHardhead/Pikeminnow Abundance
Distribution above Ralston Afterbay limited Distribution above Ralston Afterbay limited by barriersby barriers
24
Comparison SitesComparison Sites Upstream and Downstream Diversions Upstream and Downstream Diversions
SitesSites South Fork Long Canyon Diversion (2007,2008)South Fork Long Canyon Diversion (2007,2008) North Fork Long Canyon Diversion (2007)North Fork Long Canyon Diversion (2007) Duncan Creek Diversion (2007,2008)Duncan Creek Diversion (2007,2008)
Upstream and Downstream of Reservoir Upstream and Downstream of Reservoir SitesSites French Meadows Reservoir (2007)French Meadows Reservoir (2007) Hell Hole Reservoir (2007)Hell Hole Reservoir (2007)
Comparison River Sites Versus Comparison River Sites Versus Peaking Reach Sites (2007,2008?)Peaking Reach Sites (2007,2008?) Bypass Reach Sites (2007,2008)Bypass Reach Sites (2007,2008)
Fish Population ComparisonsFish Population Comparisons
25
Physical Comparability of River Physical Comparability of River Comparison SitesComparison Sites
Table AQ 2-3. Validity of Comparison Study Sites and their Associated Bypass and Peaking Reach Study Sites Based on Physical Habitat Characteristics.
By Length By Area
Fish MF44.7 Middle Fork American River below French Meadow s ●
Fish MF51.8 Middle Fork American River above French Meadow s ●
Fish R25.7 Rubicon River below Hell Hole ●
Fish R36.2 Rubicon River above Hell Hole ●
Fish NFLC1.9 North Fork Long Canyon Creek below diversion ●
Fish NFLC3.8 North Fork Long Canyon Creek above diversion ●
Fish SFLC2.3 South Fork Long Canyon Creek below diversion ●
Fish SFLC4.2 South Fork Long Canyon Creek above diversion ●
Fish D6.3 ●
Fish D8.3 ●
Fish D9.0 ●
Fish D10.0 ● Poor Poor
Fish MF4.8 Middle Fork American River above Mammoth Bar ●
Fish NF31.3 North Fork American River at Ponderosa Bridge ●
Fish MF14.1 Middle Fork American River at Otter Creek ●
Fish NF31.3 North Fork American River at Ponderosa Bridge ●
Fish MF23.5 Middle Fork American River at Horseshoe Bar ●
Fish NF31.3 North Fork American River at Ponderosa Bridge ●
Fish NF18.4 North Fork American River below Middle Fork American Confluence ●
Fish NF31.3 North Fork American River at Ponderosa Bridge ●
Fish MF26.2 Middle Fork American River above Ralston ●
Fish NFMF2.3 North Fork Middle Fork American River at Circle Bridge ●
Fish R3.5 Rubicon River at Long Canyon Creek ●
Fish NF53.7 Upper North Fork American River ●
Fish R20.9 Rubicon River at Ellicott Bridge ●Fish NF53.7 Upper North Fork American River ●
Good-Moderate
Validity of Study Site Comparison
Good
Moderate
Good
Good
Poor
Poor
Moderate
Good
Good
Good-Moderate
Comparison Study Sites
Description
Peakin
g R
each
Byp
ass R
each
Co
mp
ari
so
n S
ite
Duncan Creek below diversion
Duncan Creek above diversion
Moderate
Good-Moderate
Good-Moderate
Good
Good
Poor
Good
Moderate
Good
Good
Similar channel type, slope, w etted w idth, and pool depth.
Similar channel type, slope, w etted w idth, and pool depth.
Moderate
Poor
Similar pool depth and w etted w idth. Dissimilar channel type and slope.
Moderate Similar channel type, slope, and pool depth. Moderatly dissimilar w etted w idth.
Rationale
Similar channel type, slope, w etted w idth, and pool depth.
Similar channel type, w etted w idth, and pool depth. Moderatly dissimilar slope.
Dissimilar channel type, slope, and pool depth. Similar w etted w idth.
Dissimilar channel type, slope, w etted w idth, and pool depth.
Similar channel type, w etted w idth, and pool depth. Dissimilar slope.
Similar channel type, slope, w etted w idth, and pool depth.
Similar channel type, slope, pool depth, w etted w idth.
Similar channel type and slope. Dissimilar w etted w idth and pool depth.
Similar channel type, w etted w idth, and pool depth. Moderatly dissimilar slope.
26
Above & Below Diversions 2007 Above & Below Diversions 2007 NF Long NF Long CynCyn
SF Long CynSF Long Cyn Duncan CrkDuncan Crk
Trout per Acre
Blw DiversionAbv Diversion
Blw Diversion
Abv Diversion
Blw DiversionAbv Diversion
0500
1000150020002500300035004000
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
Nu
mb
er
of
tro
ut
pe
r a
cre
Adult YOY
Trout per Mile
Abv DiversionBlw Diversion
Abv DiversionBlw DiversionAbv Diversion
Blw Diversion
0
1000
2000
3000
4000
5000
6000
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0Nu
mbe
r o
f tr
ou
t p
er
mile
Adult YOY
Biomass (pounds per acre)Blw Diversion
Abv Diversion Blw Diversion Abv Diversion
Blw DiversionAbv Diversion
010203040506070
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
po
un
ds p
er
acre
Biomass (pounds per mile)Blw Diversion
Abv Diversion Blw DiversionAbv Diversion
Blw DiversionAbv Diversion
0
20
40
60
80
100
120
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
po
un
ds p
er
mile
S
27
Trout per Mile
Blw Diversion
Abv Diversion
Blw DiversionAbv Diversion
Blw Diversion
Abv Diversion
0
1000
2000
3000
4000
5000
6000
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
Nu
mb
er
of
tro
ut
pe
r m
ile
Adult YOY
0
10
20
30
40
50
60
70
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
Biomass (pounds per mile)
Abv DiversionBlw Diversion
Abv DiversionBlw DiversionAbv Diversion
Blw Diversion
0
20
40
60
80
100
120
NF
LC
1.9
NF
LC
3.8
SF
LC
2.3
SF
LC
4.2
D6
.3
D9
.0
po
un
ds
pe
r m
ile
All Trout
SE
NF Long NF Long CynCyn
SF Long CynSF Long Cyn
Duncan CrkDuncan Crk
Above & Below Diversions 2007 Above & Below Diversions 2007 (linear estimates only)(linear estimates only)
28
Above & Below Diversions 2008 Above & Below Diversions 2008 SF Long SF Long CynCyn
Duncan CrkDuncan CrkTrout per Mile
0
1000
2000
3000
4000
5000
6000
SF
LC
2.3
SF
LC
4.2
D6.3
D8.3
D9.0
D10.0N
um
ber
of tr
out per
mile
Adult YOYBlw Diversion Abv Diversion
Blw Diversion Abv Diversion
Trout per Acre
0500
10001500200025003000350040004500
SF
LC
2.3
SF
LC
4.2
D6.3
D8.3
D9.0
D10.0
Num
ber
of tr
out per
acre
Adult YOYBlw DiversionAbv Diversion
Blw Diversion Abv Diversion
Total Biomass (pounds per mile)
020406080
100120140160
SF
LC
2.3
SF
LC
4.2
D6.3
D8.3
D9.0
D10.0
pounds p
er
mile
Blw DiversionAbv Diversion Blw Diversion Abv Diversion
Total Biomass (pounds per acre)
020406080
100120
SF
LC
2.3
SF
LC
4.2
D6.3
D8.3
D9.0
D10.0
pounds p
er
acre
Blw Diversion
Abv DiversionBlw Diversion
Abv Diversion
29
SF Long SF Long CynCyn
Duncan CrkDuncan Crk
Above & Below Diversions 2008 Above & Below Diversions 2008 (linear estimates only)(linear estimates only)
Trout per Mile
0
1000
2000
3000
4000
5000
6000
SF
LC2.
3
SF
LC4.
2
D6.
3
D8.
3
D9.
0
D10
.0Num
ber
of tr
out p
er m
ile
Adult YOYBlw Diversion Abv Diversion
Blw Diversion Abv Diversion
Total Biomass (pounds per mile)
020406080
100120140160
SF
LC
2.3
SF
LC
4.2
D6
.3
D8
.3
D9
.0
D1
0.0
pound
s p
er
mile
Blw DiversionAbv Diversion Blw Diversion Abv Diversion
30
Biomass (pounds per mile)
Blw
FM
Re
s
Ab
v F
M R
es B
lw H
H R
es
Ab
v H
H R
es
Peaking Reach Sites
Co
mp
ariso
n R
ive
r S
ite
Byp
ass
Riv
er
Site
Co
mp
ariso
n R
ive
r S
ite Bypass River Sites
Co
mp
ariso
n R
ive
r S
ite
0
50
100
150
200
250
300
350
400
MF
44
.7
MF
51
.8
R2
5.7
R3
6.2
NF
18
.4
MF
4.8
MF
14
.1
NF
31
.3
MF
26
.2
NF
MF
2.3
R3
.5
R2
0.9
NF
53
.7
po
un
ds
pe
r m
ile
All Fish
Trout per Mile
Co
mp
ariso
n R
ive
r S
ite
Bypass River Sites
Co
mp
ariso
n R
ive
r S
ite
Byp
ass
Riv
er
Site
Co
mp
ariso
n R
ive
r S
ite
Peaking Reach Sites
Ab
v H
H R
es
Blw
HH
Re
s
Ab
v F
M R
es
Blw
FM
Re
s
4347
0
500
1000
1500
2000
2500
MF
44
.7
MF
51
.8
R2
5.7
R3
6.2
NF
18
.4
MF
4.8
MF
14
.1
NF
31
.3
MF
26
.2
NF
MF
2.3
R3
.5
R2
0.9
NF
53
.7
Nu
mb
er
of
tro
ut
pe
r m
ile
Adult YOY
Other River Comparison Sites 2007 Other River Comparison Sites 2007
(linear estimates only)(linear estimates only)
31
Other River Comparison Sites 2008Other River Comparison Sites 2008
(linear estimates only)(linear estimates only)
Total Biomass (pounds per mile)
0
20
40
60
80
100
120
MF
26
.2
NF
MF
2.3
R2
0.9
NF
53
.7Tro
ut
po
un
ds
pe
r m
ile
Comparison River SiteBypass River
Site
Comparison River Site
Bypass River Site
Trout per Mile
0
100
200
300
400
500
600
700
800
MF
26
.2
NF
MF
2.3
R2
0.9
NF
53
.7Nu
mb
er
of
tro
ut
pe
r m
ile
YOY
AdultComparison River Site
Bypass River Site
Comparison River Site
Bypass River Site
32
2007 Trout Size Rivers & Streams2007 Trout Size Rivers & Streams
Trout Large Rivers (12 Sites)
0
50
100
150
200
250
300
350
400
450
500
35
75
115
155
195
235
275
315
355
395
Fork Length (mm)
Nu
mb
er o
f F
ish
YO
Y 3-6"
6-12"
12+
"
Electrofishing Data
Snorkeling Data
Trout Small Streams (7 Sites)
0
50
100
150
200
250
300
350
400
450
500
35
75
115
155
195
235
275
315
355
395
Fork Length (mm)
Nu
mb
er o
f F
ish
Trout Peaking Reach (3 Sites)
0
50
100
150
200
250
300
350
400
450
500
35
75
115
155
195
235
275
315
355
395
Fork Length (mm)
Nu
mb
er o
f F
ish
YO
Y
3-6"
6-12"
12+
"
Snorkeling Data
33
2008 Trout Size Rivers & Streams2008 Trout Size Rivers & Streams
Trout Large Rivers (5 Sites)
0
5
10
15
20
25
30
35
40
45
50
35
75
115
155
195
235
275
315
355
395
435
475
515
555
595
Fork Length (mm)
Nu
mb
er
of
Fis
h
Electrofishing DataSnorkeling Data
YO
Y 3-6
"
6-1
2"
12-1
8"
18+
"
Trout Small Streams (6 Sites)
0
20
40
60
80
100
120
140
160
180
35
75
115
155
195
235
275
315
355
395
435
475
515
555
595
Fork Length (mm)
Nu
mb
er
of
Fis
h
Trout Peaking Reach (3 Sites)
0
5
10
15
20
25
30
35
40
45
50
35
75
115
155
195
235
275
315
355
395
435
475
515
555
595
Fork Length (mm)
Nu
mb
er
of
Fis
h
YO
Y
3-6
"
6-1
2"
12-1
8"Snorkeling Data
18+
"
34
Trout Condition Factors in RiversTrout Condition Factors in Rivers
Condition Factor
nCondition
Factorn
2007 -- NA1 -- NA1
2008 -- NA1 -- NA1
2007 1.01 10 -- NA1
2008 1.01 2 -- NA1
Fish MF23.5 2008 -- NA1 -- NA1
2007 1.02 24 1.31 2
2008 1.11 21 1.05 1
Fish MF36.2 2007 1.04 43 1.05 1
2007 1.06 5 1.07 25
2008 1.09 13 1.09 13
Fish MF51.8 2007 1.07 15 1.05 3
Fish R3.5 2007 1.06 11 -- Not Observed
2007 1.05 98 1.14 4
2008 1.10 84 1.15 3
Fish R25.7 2007 1.09 27 1.13 6
Fish R36.2 2007 1.08 38 0.98 1
Fish LC9.0 2007 1.10 81 -- Not Observed
Fish NFLC1.9 2007 1.05 79 -- Not Observed
Fish NFLC3.8 2007 1.04 113 -- Not Observed
2007 1.09 46 -- Not Observed
2008 1.06 136 -- Not Observed
2007 1.11 25 -- Not Observed
2008 1.07 159 -- Not Observed
2007 1.11 83 1.07 13
2008 1.10 143 1.09 40
Fish D8.3 2008 1.06 159 1.11 18
2007 1.16 82 1.06 3
2008 1.13 131 1.13 8
Fish D10.0 2008 1.15 115 1.09 10
2007 1.09 22 -- Not Observed
2008 1.06 32 -- Not Observed
Fish NF18.4 2007 -- NA1 -- NA1
Fish NF31.3 2007 -- NA1 -- NA1
2007 1.10 16 -- Not Observed
2008 1.02 11 -- Not ObservedFish NF53.7
Study River and Sample ID Year
Fish MF4.8
Fish MF14.1
Fish MF26.2
Fish MF44.7
1NA=snorkel only site, no weights were collected to calculate biomass
Middle Fork American River from Middle Fork Interbay to Ralston Afterbay
Middle Fork American River Upstream of Middle Fork Interbay
Rubicon River
Fish R20.9
Fish SFLC2.3
Fish SFLC4.2
Fish D6.3
Fish D9.0
Fish NFMF2.3
RBT BNT
Table AQ 2-11. Rainbow Trout (RBT) and Brown Trout (BNT) Condition Factors.
North Fork American River
Middle Fork American River Downstream of Ralston Afterbay
North Fork Long Canyon Creek
South Fork Long Canyon Creek
Duncan Creek
North Fork of the Middle Fork American River
Long Canyon Creek
Trout/mile
0
0
0
1
1
1
1
1
#REF!
35
Ralston AfterbayRalston Afterbay Gill Netting Gill Netting
CPUE (see previous reservoir results)CPUE (see previous reservoir results) SonarSonar
Map & Estimates by depthMap & Estimates by depth ElectrofishingElectrofishing
Map & Estimates by fish species and Map & Estimates by fish species and sizesize
Gear SelectivityGear Selectivity All fishAll fish HardheadHardhead
36
Ralston AfterbayRalston Afterbay
Gill Netting LocationsGill Netting Locations
37
Ralston AfterbayRalston Afterbay
Sonar TransectsSonar Transects
38
Ralston AfterbayRalston Afterbay Sonar ResultsSonar ResultsTable AQ 2-8. Fish Counts and Total Fish Estimates from Ralston Afterbay Sonar Sampling.
Depth (ft) Fish CountReservoir Volume Surveyed
(10 ft3)
Total Reservoir Volume
(10 ft3)Percent of Reservoir
Volume SurveyedTotal Fish Estimate
0.0 - 3.4 97 113 9,499 1.2% 8,1543.4 - 8.4 57 378 12,662 3.0% 1,909
8.4 - 13.4 34 365 9,181 4.0% 85513.4 - 18.4 9 187 5,463 3.4% 26318.4 - 23.4 0 41 3,058 1.3% 023.4 - 28.4 0 0.01 1,359 0.0008% 028.4 - 33.4 0 0 634 0 --33.4 - 38.4 0 0 352 0 --38.4 - 43.4 0 0 204 0 --43.4 - 48.4 0 0 91 0 --
Total 197 1,084.01 41,222 2.6% 11,181
Depth (ft) Fish CountReservoir Volume Surveyed
(10 ft3)
Total Reservoir Volume
(10 ft3)Percent of Reservoir
Volume SurveyedTotal Fish Estimate
0.0 - 4.1 194 211 11,633 1.8% 10,6964.1 - 9.1 57 748 12,662 5.9% 965
9.1 - 14.1 27 863 9,181 9.4% 28714.1 - 19.1 8 781 5,463 14.3% 5619.1 - 24.1 10 535 3,058 17.5% 5724.1 - 29.1 5 217 1,359 16.0% 3129.1 - 34.1 5 125 634 19.7% 2534.1 - 39.1 3 93 352 26.4% 1139.1 - 44.1 0 63 204 30.9% 044.1 - 49.1 0 29 91 31.9% 0
Total 309 3,665 44,637 8.2% 12,128
Early Summer - June 26, 2008
Fall - Sept. 3, 2008
39
Ralston AfterbayRalston Afterbay
Electrofishing LocationsElectrofishing Locations
40
Ralston AfterbayRalston Afterbay ElectrofishingElectrofishing
Jun 26, 2008 Sep 4, 20080.34 miles sampled 0.68 miles sampled
YOY 2.9 --3-6" -- --
6-12" 2.9 2.912-18" -- --18"+ -- --YOY -- --3-6" 2.9 1.5
6-12" 2.9 --12-18" 2.9 1.518"+ 2.9 1.5YOY 5.9 1.53-6" 108.8 104.4
6-12" -- 1.512-18" -- --18"+ -- --YOY 8.8 --3-6" 108.8 102.9
6-12" 2.9 2.912-18" -- --18"+ -- 1.5YOY 5.9 --3-6" 123.5 44.1
6-12" 5.9 8.812-18" -- 4.418"+ -- 10.3
2YOY = Young of the year
RBT
BNT
HH
SPM
Fish per Mile
Species1 Size Class2
SS
1Species: RBT = Rainbow Trout, BNT = Brown Trout, HH = Hardhead, SPM = Sacramento Pike Minnow, SS = Sacramento Sucker
41
Ralston AfterbayRalston Afterbay Gear Size SelectivityGear Size Selectivity
Ralston Afterbay Summer Sampling Period
All Species
0
10
20
30
40
50
50 80 110
140
170
200
230
260
290
320
350
380
410
440
470
500
530
560
590
Fish Length (mm)
Fre
qu
ency
Electrofishing
Gill netting
42
Ralston AfterbayRalston Afterbay HardheadHardhead
Hardhead
0
5
10
15
20
25
30
35
40
50
70
90
110
130
150
170
190
210
230
250
270
290
310
330
350
370
390
410
430
450
470
490
Fork Length (mm)
Fre
qu
en
cy
Electrofishing (2008)
Gill Netting (2007 - 2008)
Qualitative Gill Netting (2008)
Ralston Afterbay2007 - 2008
1
43
Other Survey Results Other Survey Results (see 2007-2008 Report)(see 2007-2008 Report)
Trout Age and Growth RiversTrout Age and Growth Rivers Reservoir Trout SizeReservoir Trout Size Timing of FryTiming of Fry
Rainbow and Brown Trout FryRainbow and Brown Trout Fry Hardhead-PikeminnowHardhead-Pikeminnow
2007 Electrofishing Versus Snorkeling2007 Electrofishing Versus Snorkeling 2007 Small Stream Diversion Pool Sampling2007 Small Stream Diversion Pool Sampling Species and Lifestage PeriodicitySpecies and Lifestage Periodicity Water TemperatureWater Temperature
44
Fish Population Sampling Sites 2009Fish Population Sampling Sites 2009 Review 2007 and 2008 data with Aquatic TWG Review 2007 and 2008 data with Aquatic TWG
to determine which river sites will be sampled to determine which river sites will be sampled in year 3, if any, to identify the temporal in year 3, if any, to identify the temporal abundance of fish species.abundance of fish species.
Identify appropriate fish standing Identify appropriate fish standing crop comparison datasets in crop comparison datasets in collaboration with the Aquatic TWGcollaboration with the Aquatic TWG
Consultation NeedsConsultation Needs
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