Transcript Comparison of PIT Tag detectability – 9mm vs. 12mm

Objective
• Determine how using 9mm tags may affect our current
research project in the John Day Basin
Study Location
-Rotary Screw Trap
-Middle Fork Array
Study Background
• 9mm Tags:
• Could Allow tagging and tracking of
early life stages.
• Possibly reduced tag effects.
• 1st year of a 3-year study
• Paired Release Study - 9mm vs 12mm
detectability
• IMW Crews began deploying 9mm tags
(Summer 2014)
Study Background
• Hypotheses:
• 12mm tags would be detected at higher rates at all tested sites.
• As flow increases probability of detection decreases.
• Factors Monitored:
• Mean Daily Flow (Q) at release.
• Release Temperature
• Individual Fish Metrics
• Length
• Weight
• Release Day
Methods
• Used Rotary Screw Trap to capture out-migrating steelhead smolt.
• Tag groups:
• 12mm Trial - 9mm Trial - 12mm Standard Release
• Released trial groups directly into river one mile above the MF Array.
• FS1001M MUX – 2x3 Antennas
• Tag Shed Study
• March 21st - June 6th, 2014
Results
Middle Fork ArrayMeasured Detection Distance
Distance above antenna (cm)
40
9mm Tag
35
12mm Tag
30
25
Water Level
20
15
10
5
0
1
2
3
4
Antenna Number
5
6
Tagging Summary
12mm
Trial
9mm
Trial
Standard
Release
Marked
347
347
376
Released
346
344
376
MF Array Detections
Columbia Detections
56
44
15
45
N/A
37
250
Marking: Size Distribution
No Array Data
200
Detected @MF Array
Undetected @MF Array
150
100
50
0
9mm Trial
12mm Trial
12mm Standard
Marking: Flow and Timing
Mean Daily Flow (cfs)
2000
100%
Mean Q
Tagging Progress
90%
80%
70%
1500
60%
50%
1000
40%
30%
500
20%
10%
0
0%
Tagging Progress
2500
Probability of Detection: Mainstem Columbia
50%
Probability of Detection
45%
40%
35%
30%
25%
20%
15%
10%
5%
27.34%
25.33%
18.07%
14.58%
9.61%
16.35%
12mm
9mm
Standard
12mm
9mm
Standard
0%
John Day
Bonneville
Model Testing - R
df
AIC
m.Group.FL.Flow
4
432.4
m.Group.FL
3
432.8
m.Group
2
433.1
m.Group_FL
4
433.6
m.Group.FL.Flow.Day
5
434.0
m.Group.FL.Flow.Temp
5
434.2
m.All
6
436.0
m.Group.FL.Flow_Temp
6
436.1
m.FL
2
458.9
(Intercept)
2.80
1.567
1.789
0.0736
m.Flow
2
459.4
Group
-1.46
0.302
-4.84
<.001
m.Day
2
461.2
FL
-0.001
0.006
-1.608
0.108
m.Temp
2
461.3
Flow
0.003
0.002
1.636
0.102
Temp
0.019
0.107
0.173
0.862
-0.019
0.042
-0.474
0.635
Coefficients:
ALL
Std.
Estimate Error
Day
z value
Pr(>|z|)
Probability of Detection: Middle Fork Array
30%
Probability of Detection
25%
20%
15%
10%
5%
16.31%
4.34%
12mm
9mm
0%
Mark Individual Covariates – Mean Daily Flow
12mm
9mm
Mark Individual Covariates – Fork Length
12mm
9mm
Conclusions
• 9mm tags have a much lower probability of detection at the MF Array
when compared to 12mm tags
• There is no apparent difference in detection at John Day Dam or
Bonneville.
• Flow effects on detection probability were difficult to test during this
season.
• Some evidence to suggestion fish length affects detection rates.
Acknowledgments
Bonneville Power Administration
Oregon Watershed Enhancement Board
Private landowners
Field crew and volunteers
Questions?