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

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Acknowledgements This project was completed by the Ministry of Environment, Fisheries Science Section under a Memorandum of Understanding with BC Hydro, Burnaby BC. Dave Hunter, Resource Specialist, of BC Hydro provided considerable logistical support. Fertilizer application & tank farm security was completed by Robert Marlatt, a British Columbia Conservation Foundation contractor. Field assistance was provided by Robert W. Land, Stacie Kalyn, Sheldon Reddekopp, Mike Gass, Emma Jane Johnson & Frank Kwak. Sheldon Reddekopp was responsible for the delivery of this project for 2004 and 2005. Flow data were provided by Cathy Bowie of BC Hydro, Power Records. Taxonomic identification and enumeration of phytoplankton samples were conducted by Dr. John Stockner (Eco-Logic Ltd.). Identification and enumeration of zooplankton samples were conducted by Danusia Dolecki (UBC Dept. of Zoology) and Lidija Vidmanic (Ecolab Ltd.). Kokanee stream enumerations were completed by Jessica Banning, Jennifer Sarchuk & Allison Herbert (British Columbia Institute of Technology, Fish and Wildlife Program. George Scholten, Dale Sebastian, and Patricia Woodruff from MOE (Victoria) conducted and analyzed hydroacoustic survey data. Charlotte Roseanau of The Freshwater Fisheries Society of BC (FFSBC) completed the fish triploiding procedures, reared all stocked fish to size, and completed the annual fish stocking. Thanks to Deborah McNicol of the British Columbia Conservation Foundation for contract management. From the UBC MOE office, Debbie Aird provided administrative and computer support and to Jennie Hutchinson for corporate services support. From the Lower Mainland Regional MOE office, Greg Wilson provided helpful advice, support and valuable experience with the fertilization program. The continued support and encouragement for the fertilization research program from Dr. Ted Down, Manager of the Fisheries Science Section, is greatly appreciated. Financial support for this project was provided by BC Hydro and the Ministry of Environment. v
Table of Contents EXECUTIVE SUMMARY .......................................................................................... III ACKNOWLEDGEMENTS .......................................................................................... V TABLE OF CONTENTS............................................................................................ VI LIST OF FIGURES ................................................................................................. VIII LIST OF TABLES....................................................................................................... X LIST OF TABLES....................................................................................................... X LIST OF PHOTOGRAPHS ....................................................................................... XI 1 INTRODUCTION ................................................................................................ 1 2. STUDY AREA..................................................................................................... 2 3. METHODS.......................................................................................................... 3 3.1 Fertilizer Additions...................................................................................................................................... 3 3.2 Reservoir Operations ................................................................................................................................... 8 3.3 Physical and Chemical................................................................................................................................. 8 3.4 Phytoplankton Enumeration ...................................................................................................................... 10 3.5 Zooplankton............................................................................................................................................... 10 3.6 Fish Stocking ............................................................................................................................................. 11 3.7 Spawner Surveys ....................................................................................................................................... 11 3.8 Gillnetting and Minnow Trapping ............................................................................................................. 12 3.9 Hydroacoustics .......................................................................................................................................... 13 4. RESULTS ......................................................................................................... 15 4.1 Reservoir elevation .................................................................................................................................... 15 4.2 Physical Parameters ................................................................................................................................... 15 4.3 Water Chemistry........................................................................................................................................ 17 4.4 Phytoplankton............................................................................................................................................ 20 4.5 Zooplankton............................................................................................................................................... 25 4.6 Spawner Surveys ....................................................................................................................................... 29 4.7 Gillnetting and Minnow Trapping ............................................................................................................. 33 4.8 Hydroacoustics .......................................................................................................................................... 39 5. DISCUSSION ................................................................................................... 42 Comparison with other lakes/reservoirs........................................................................................................... 44 6. RECOMMENDATIONS..................................................................................... 47 vi
Page 1 and 2: Wahleach Project Water Use Plan Wah
Page 3 and 4: Citation: Harris, S.L., D. Sebastia
Page 5: spawners, from 0 spawners at the st
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 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
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