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

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Seasonal average total zooplankton biomass more than doubled over the study period, from 20.2 μg·L -1 in 2004 to 54.5 μg·L -1 in 2006 (Fig. 14). The biomass was largely dominated by other cladocerans and Daphnia sp which accounted for between 95 and 99% of the total zooplankton biomass in 2004, 2005 and 2006 (Fig. 15). Although Daphnia sp. was present in samples during the entire season in 2005 and 2006, it dominated the biomass from August to October, where Daphnia sp accounted for >95% of the biomass (Fig. 15). The highest total zooplankton biomass of >80 μg·L -1 was observed in July & August 2006, when Daphnia accounted for up to 90% of total biomass (Fig. 15). Percentage (%) 100 80 60 40 20 0 May 04 June 04 July 04 Aug 04 Sept 04 Oct 04 Nov 04 May 05 June 05 July 05 Aug 05 Sept 05 Oct 05 Nov 05 May 06 June 06 July 06 Aug 06 Contribution of Daphnia to Total Density (%) Contribution of Daphnia to Total Biomass (%) Figure 15. Contribution of Daphnia sp to total zooplankton density and biomass, expressed as a percentage, for 2004-2006. Wahleach Reservoir Fertilization Project, 2004-2006. Sept 06 Oct 06 Nov 06 28
4.6 Spawner Surveys The number of kokanee spawners has increased over the study period, where cumulative numbers range from approximately 1,800 in 2004 to over 8,000 in 2006 (Fig. 16). Escapement is approaching values found in 2001, when over 9,000 spawners were recorded. Given that Jones Creek was not enumerated in 2005, the actual number of spawners were likely higher than 3,900 but given the high interannual variability it is difficult to estimate the number of spawners in Jones Creek. For instance, Boulder Creek accounted for 53% of total spawners in 2006 but only 11% in 2004. Kokanee spawners 10000 8000 6000 4000 2000 0 1973 1979 1994 1995 1996 1997 1998 1999 2000 250 * * * * * 2001 2002 267 2003 237 * * * Figure 16. Total number of kokanee spawners in Wahleach Reservoir, 1973-2006. The numbers above the bars are mean fork lengths (mm) of spawners and the star (*) indicates years of kokanee stocking. During 2006, minimal large woody debris was observed in Boulder Creek and crown closure was limited at 5%. In the lower reaches of Boulder Creek the substrate was a mixture of gravel and fine sediments that may provide some spawning habitat for kokanee salmon. In Flat Creek, coarse woody debris was present throughout the channel. The creek has large sections of fine sediments and few spawning gravels generally located in tail-out pools within 1 km from Flat Creek’s confluence with Wahleach Reservoir. Throughout the 1 km study site, there is medium crown closure providing both shady and open sections. In Wahleach/Jones Creek, course woody debris was present throughout the creek. The confluence with the reservoir Wahleach Reservoir Fertilization Project, 2004-2006. 2004 255 2005 242 2006 29
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: Density (individuals·L -1 ) Biomas
Page 43 and 44: providing some spawning opportuniti
Page 45 and 46: Kokanee spawners 10000 8000 6000 40
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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