Wahleach Project Water Use Plan Wahleach Reservoir ... - BC Hydro

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Photo 3. Upgraded weir on Boulder Creek blocking access to spawning ground, September, 2006. Wahleach Reservoir Fertilization Project, 2004-2006. 32
Kokanee spawners 10000 8000 6000 4000 2000 0 Jones Creek Flat Creek Boulder Creek yr2001 2002 2003 2004 2005 2006 Figure 17. Total enumerated kokanee spawners by location in Wahleach Reservoir, 2001-2006. 4.7 Gillnetting and Minnow Trapping Fish species captured in Wahleach Reservoir include rainbow trout (O. mykiss), kokanee (O. nerka) and cutthroat trout (O. clarki clarki). Threespine Sticklebacks (Gasterosteus aculeatus) were captured in the minnow traps. The gillnetting in 2004 and 2005 was conducted in June, while in 2006 sampling was completed later in the year in October. This resulted in substantially different catch results between 2004/2005 and 2006. In 2004, a total of 298 fish were caught for a CPUE of 2.29 fish·net hr with cutthroat trout being the most numerous with 138 caught (46% of the total catch), followed by rainbow trout (40%) and kokanee (13%) (Table 4). In 2005, the number of fish caught was 211 for a CPUE of 1.81 fish fish·net hr, similar to the catch in 2004, but with rainbow trout being the most numerous species with 109 caught (52% of total catch), followed by cutthroat trout (26%) and kokanee (23%). Fish catch in 2006 was less than half the numbers observed in 2004 and 2005, with a total of 69 fish caught for a CPUE of 0.68 fish·net hr, approximately 33% of the catch rates of 2004 and 2005. The species distribution of the catch in 2006 was similar to the proportions observed in 2004 with rainbow trout accounting for 55% of the total catch, followed by cutthroat trout (28%) and Wahleach Reservoir Fertilization Project, 2004-2006. 33
Page 1 and 2: Wahleach Project Water Use Plan Wah
Page 3 and 4: Citation: Harris, S.L., D. Sebastia
Page 5 and 6: spawners, from 0 spawners at the st
Page 7 and 8: Table of Contents EXECUTIVE SUMMARY
Page 9 and 10: List of Figures Figure 1 Map of stu
Page 11 and 12: List of Tables Table 1. Annual fert
Page 13 and 14: 1 Introduction The Wahleach Reservo
Page 15 and 16: 3. Methods 3.1 Fertilizer Additions
Page 17 and 18: Photo 1. Old tank farm, consisting
Page 19 and 20: Nitrogen Load (mg·N·m -2 ) 140 12
Page 21 and 22: Vertical profiles of dissolved oxyg
Page 23 and 24: y gravid females and the lengths of
Page 25 and 26: hydroacoustic surveys was used in o
Page 27 and 28: 4. Results 4.1 Reservoir elevation
Page 29 and 30: 4.3 Water Chemistry The mean pH was
Page 31 and 32: Silicic acid is used by diatoms to
Page 33 and 34: Density (cells mL -1 ) 4000 3000 20
Page 35 and 36: Chrysoflagellates and Chryptoflagel
Page 37 and 38: 4.5 Zooplankton The zooplankton com
Page 39 and 40: Density (individuals·L -1 ) Biomas
Page 41 and 42: 4.6 Spawner Surveys The number of k
Page 43: providing some spawning opportuniti
Page 47 and 48: Catch Per Unit Effort (# Fish·Net
Page 49 and 50: Weight (mm) Fork Length (mm) 60 55
Page 51 and 52: 4.8 Hydroacoustics Good weather pro
Page 53 and 54: strengths suggested these fish were
Page 55 and 56: Table 5 lists the range and the mea
Page 57 and 58: Wahleach Reservoir had lower total
Page 59 and 60: 6. Recommendations 1) Fertilization
Page 61 and 62: 7. References APHA. 1985. Standard
Page 63 and 64: Pick, F.R. and D.R.S. Lean. 1987. T
Page 65 and 66: Appendix 1. Phytoplankton species a

Wahleach Project Water Use Plan Wahleach Reservoir ... - BC Hydro

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