2. Objective Determine how using 9mm tags may affect our current research project in the John Day Basin

3. Study Location -Rotary Screw Trap -Middle Fork Array

4. 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

5. 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

6. 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 21 st - June 6 th, 2014 Methods

7. Results

8. Middle Fork Array- Measured Detection Distance Water Level

9. 12mm Trial 9mm Trial Standard Release Marked347 376 Released346344376 MF Array Detections5615N/A Columbia Detections444537 Tagging Summary

10. Marking: Size Distribution @MF Array

11. Marking: Flow and Timing

12. Probability of Detection: Mainstem Columbia

13. dfAIC m.Group.FL.Flow4432.4 m.Group.FL3432.8 m.Group2433.1 m.Group_FL4433.6 m.Group.FL.Flow.Day5434.0 m.Group.FL.Flow.Temp5434.2 m.All6436.0 m.Group.FL.Flow_Temp6436.1 m.FL2458.9 m.Flow2459.4 m.Day2461.2 m.Temp2461.3 Coefficients: ALL Estimate Std. Errorz valuePr(>|z|) (Intercept) 2.801.5671.7890.0736 Group -1.460.302-4.84<.001 FL -0.0010.006-1.6080.108 Flow 0.0030.0021.6360.102 Temp 0.0190.1070.1730.862 Day -0.0190.042-0.4740.635 Model Testing - R

14. Probability of Detection: Middle Fork Array

15. 12mm 9mm Mark Individual Covariates – Mean Daily Flow

16. 12mm 9mm Mark Individual Covariates – Fork Length

17. 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.

18. Acknowledgments Bonneville Power Administration Oregon Watershed Enhancement Board Private landowners Field crew and volunteers

19. Questions?