Mitigation for the Construction and Operation of Libby Dam

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Catch per Trap-Day 0.3 0.25 0.2 0.15 0.1 0.05 r 2 = 0.007 p = 0.794 0 11/5/03 12/25/03 2/13/04 4/3/04 Date Figure 15. Scatter plot of mean burbot catch rates (catch per trap-day) versus trap date. Mean Burbot Catch per Trap- Day 0.1 0.08 0.06 0.04 0.02 0 Y = 0.0276Ln(x) - 0.0082 R 2 = 0.6203; P = 0.012 0 5 10 15 20 25 30 Depth Category (m) Figure 16. Scatter plot and regression of mean burbot catch rates (catch per trap-day) for 3 meter depth categories ranging from 2 to 33 meters. 67
The Libby FWP Mitigation Staff surgically implanted 28 coded acoustic and 12 combined radio/acoustic tags in burbot 6 trapping sites, respectively (Table 3). Each tag had a unique frequency or code to allow for individual fish identification. The first burbot was tagged on November 20, 2003 and the last burbot was tagged on April 26, 2004. The Libby FWP Mitigation staff has expended approximately 1-2 days per week since trapping efforts began in November to search for tagged fish using primarily the acoustic gear. Currently we have relocated the 40 burbot tagged with a coded acoustic and combined radio/acoustic transmitters an average of 1.8 times per fish (Figure 17). However, there were 3 combined radio/acoustic and and 7 acoustic tagged burbot, that were not observed since release. We estimated that the mean home range was 6524 m (range 166 – 27470 m; Table 3) for the 30 tagged burbot that relocated at least once. The mean estimated depth of burbot that were relocated during daylight searches using acoustic gear was 35.6 m, which was significantly deeper (p = 2.47*10 -67 ) than the mean depth which we operated traps (14.8 m). We did not perform any nighttime acoustic observations. We were not able to discern any clear movement patterns for the tagged fish in terms of either upstream or downstream movement. Of the 40 tagged burbot, 14 of these fish had 3 or more relocation observations, six of these fish moving upstream, 7 moved downstream and one fish showed relatively little movement. However, we were able to determine that many of the tagged burbot extensively utilized the old Kootenai River channel and floodplain during daylight hours (Figure 18). For example, of the 14 tagged burbot for which we had at least 3 relocation observations, 11 of those fish were consistently and repeatedly using either the old Kootenai River channel or floodplain area. On average, the acoustic and acoustic/radio tags will be active until early 2006, which will allow us to collect additional observations on the tagged fish, which in turn will provide additional insight into the spawning distribution and habitat preferences of burbot within Libby Reservoir. 68
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Mitigation for the Construction and
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MITIGATION FOR THE CONSTRUCTION AND
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depth of burbot that were relocated
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ACKNOWLEDGEMENTS We are thankful to
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Juvenile Salmonid Population Estima
Page 11 and 12: deviation from reference conditions
Page 13 and 14: Figure 46. Minimal detectible diffe
Page 15 and 16: Chapter 2 Tables Table 1. Design sp
Page 17 and 18: INTRODUCTION Libby Reservoir was cr
Page 19 and 20: PROJECT HISTORY Montana Fish, Wildl
Page 21 and 22: 2002 - Montana FWP collaborated wit
Page 23 and 24: DESCRIPTION OF STUDY AREA Subbasin
Page 25 and 26: Table 1. Current relative abundance
Page 27 and 28: Similar impacts have been observed
Page 29 and 30: 2460 2440 2420 2400 2380 2360 2340
Page 31 and 32: construction and operation of Libby
Page 33 and 34: Chapter 1 Physical and Biological M
Page 35 and 36: Biological monitoring data was prov
Page 37 and 38: Figure 1. An aerial photograph of L
Page 39 and 40: antenna located approximately 5 cm
Page 41 and 42: We compared samples collected in Se
Page 43 and 44: extends downstream 131 m. This sect
Page 45 and 46: and reduced again to 28 ganged floa
Page 47 and 48: Results Bull Trout Redd Counts Grav
Page 49 and 50: Table 1. Bull trout redd survey sum
Page 51 and 52: Quartz Creek Bull trout redd counts
Page 53 and 54: Bull Trout Redds 40 35 30 25 20 15
Page 55 and 56: Keeler Creek Bull trout that spawn
Page 57 and 58: Burbot Monitoring Below Libby Dam T
Page 59 and 60: Table 2. Summary information for th
Page 61: 7000 6000 5000 Y = 45.246e 0.0055x
Page 65 and 66: Table 2. (Continued) Capture locati
Page 67 and 68: Figure 18. Capture locations for a
Page 69 and 70: Table 4. T-test results. This table
Page 71 and 72: Figure 19. Montana Mountain Metrics
Page 73 and 74: Table 5. T-test results. This table
Page 75 and 76: Juvenile Salmonid Population Estima
Page 77 and 78: Grave Creek Juvenile salmonid monit
Page 79 and 80: Number Fish per 1000 Feet 100 80 60
Page 81 and 82: Libby Creek Section 1 of Libby Cree
Page 83 and 84: Figure 28. Rainbow trout, brook tro
Page 85 and 86: Pipe Creek Juvenile rainbow trout w
Page 87 and 88: Table 6. Average length and weight
Page 89 and 90: Catch per Net A. Mountain Whitefish
Page 91 and 92: Table 8. Kamloops rainbow trout cap
Page 93 and 94: 25000.0 20000.0 15000.0 10000.0 500
Page 95 and 96: Burbot per Trap Day 3 2.5 2 1.5 1 0
Page 97 and 98: Table 9. Average catch per net for
Page 99 and 100: Table 11. Percent composition of ma
Page 101 and 102: deviation = 0.052; Figure 43), with
Page 103 and 104: Table 12. Individual probability va
Page 105 and 106: Discussion Long-term monitoring of
Page 107 and 108: We believe that Libby Reservoir dur
Page 109 and 110: Figure 47. Minimal detectible diffe
Page 111 and 112: References Bahls, L., R. Bukantis,
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trout status report (below Kootenai
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Chapter 2 Stream Restoration and Mi
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food sources, as evidenced by the l
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Methods and Results Eureka Pond The
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spacing was 172.8 feet, which repre
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Figure 2. Vicinity Map for Upper Li
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Table 1. Design specifications for
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70 60 50 40 30 20 10 0 500 1000 150
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Grave Creek Phase I Restoration Pro
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Table 4. Design specifications for
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190.0 185.0 180.0 175.0 170.0 165.0
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educed the mean width and width to
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Table 7. Mean cross sectional area,
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Discussion The Grave Creek Phase I
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References Chisholm, I.M., M.E. Hen
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Appendix 148
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Table A2. Lower Grave Creek Demonst
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Table A4. Libby Creek depletion pop
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Table A7. Mean zooplankton densitie
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Table A9. Mean zooplankton densitie
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Table A13. Yearly mean total zoopla
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Mitigation for the Construction and Operation of Libby Dam

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