Federal Energy Regulatory Commission Hydroelectric Operations
19
Federal Energy Regulatory Commission Hydroelectric Operations
description
Federal Energy Regulatory Commission Hydroelectric Operations . Wild Rainbow ( Redband ) Trout . Redband Spawning and Population Study Elements Hydrology Review Spawning Patch Inventory of the Study Area Physical Characterization of Spawning Patches - PowerPoint PPT Presentation
Transcript of Federal Energy Regulatory Commission Hydroelectric Operations
Federal Energy Regulatory CommissionHydroelectric Operations
Wild Rainbow (Redband) Trout
Redband Spawning and Population Study Elements
• Hydrology Review
• Spawning Patch Inventory of the Study Area
• Physical Characterization of Spawning Patches
• Hydrodynamic Characterization of Spawning Patches
• Biological Spawning Characterization
• Effective Spawning/Incubation Habitat Relationships
• Redband Trout Abundance Estimates (ten years)
Study Reach and Patch Inventory (2009)
Substrate Characterization
Survey Patch Area and Elevation
Survey Water Elevations
Redband Trout Spawning Period 2010
April 1 - 7
April 8 - 14
April 15 -
21
April 22 -
28
April 29 - May 5
May 6 - 12
0
2
4
6
8
10
12
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
Number of Redds Observed Average Daily Discharge
Date
Num
ber o
f Red
ds O
bser
ved
Ave
rage
Dai
ly D
isch
arge
(cfs
)
Spawning Survey (2010)
Spawning Areas Mapped
Observed Redband Trout Depth and Velocity Frequency
0 1 2 3 4 5 6 7 80
5
10
15
20
25
30
35
40
45
50
Velocity (ft/s) Depth (ft)
Feet or Feet/Sec
Freq
uenc
y
Artificial Redds for Intra-gravel Survival
Trout Fry Survival
Cumulative Spawning Plot Area
0 2000 4000 6000 8000 10000 12000 140000
10000
20000
30000
40000
50000
60000
70000
80000
90000
100000
Discharge (cfs)
Tota
l Pat
ch A
rea
(ft^2
)
Results 2010
• 58 Gravel Patches
• Deeper Spawning: Ave. 3.5’, Max. Over 5 Feet
• 148 Redds Counted in 2010 (130 in 2003)
• Appears There is Good Intra-Gravel Survival
• Habitat Over a Range of Flows
• Effective Spawning and Incubation Habitat Tables
Mark-Recapture Population Estimate
Results
• Tagged Over 800 Redbands in 2010
• Estimated Over 1,300 Ten Inch Fish in 2010
• Tagged Over 650 Redbands in 2011
• Estimated Over 1,400 Ten Inch Fish in 2011
• Tagged Over 455 Redbands in 2012
• Estimate Over 1,050 Ten Inch Fish in 2012
Effective Spawning and Incubation Habitat
Fork Length (mm)
0 50 100 150 200 250 300 350 400 450 500
Prop
ortio
n of
the
catc
h (%
)
0
1
2
3
4
5
6
7Age 0 Age 1 Age 2 Age 3 Age 4 Age 5 Age 6
Length and Age Frequency
