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Howard Paish & Associates ANGLER CATCH AND USE SURVEY OF ROSS RESERVOIR AND THE CANADIAN SKAGIT RIVER, 1985 PREPARED FOR B.C. MINISTRY OF ENVIRONMENT REGIONAL FISHERIES REPORT NO. LM-102 JANUARY 1986 HOWARD PAISH & ASSOCIATES Natural Resource Planning and Analysis Coquitlam, B.C. Whitehorse, Yukon ANGLER CATCH AND USE SURVEY OF ROSS RESERVOIR AND THE CANADIAN SKAGIT RIVER, 1985 Prepared for i t i sh Col umb i a Ministry o-f Env i ronmen t Prepared by K.J. Scott G.R. Peterson Howard Paish and Associates, Ltd, 1102 Grover Avenue Coqu i 11 am, B.C. V3J 3G1 Regional Fisheries Report No. LM102 January, 1986 i Preface In June 1985. Howard Paish and Associates Ltd. was retained by British Columbia Ministry of Environment to conduct angler catch and use surveys of the Canadian Skagit River and the portion of Ross Reservoir accessed through Canada. Early in the study* funding was provided to Washington Department of Game to conduct a survey similar in objectives and scope on the American portion of the reservoir. At the request of the Ministry of Environment the surveys of Ross Reservoir were combined to maximize consistency of survey methods and data collection. From July 18, 1985, Washington Department of Game worked with Howard Paish and Associates and surveyed the American portion of Ross Reservoir. Surveys on the Canadian Skagit River were conducted by Howard Paish and Associates. Washington Department of Game continued the Ross Reservoir survey from October i to 31, after the consultant surveys terminated on September 30, and provided the results of their October survey for inclusion in this report. Funding for both studies was provided by the Skagit Environmental Endowment Commission. ii Abstract At Ross Reservoir, •from June 14 to October 31, 1985, angler effort was estimated at 65,673 hours (14,550 days). An estimated 21,979 rainbow trout were caught of which 83% were harvested. The estimated total catch o-f Dolly Varden char, brook trout and cutthroat trout was 2,065, 421 and 24, respectively. Angler e-f-fort at Ross Reservoir was greatest during the opening week o-f the -fishery; angler catch rates were high during the opening week and in October. At the Canadian Skagit and Sumallo Rivers, -from June 14 to September 30, 1985, angler e-f-fort was estimated at 16,548 hours (4,142 days). An estimated 3,579 rainbow trout were caught o-f which 2,307 (65%) were harvested. The estimated total catch o-f Dolly Varden char, brook trout and cutthroat trout was 56, 87, and 0, respectively. Angler e-f-fort was heaviest during June, particularly on opening weekend. Rainbow trout tagging studies showed that only a portion o-f the migratory reservoir stock remained in the Skagit River to contribute to the -fishery in 1985. i j i Table of Contents Page Preface i Abstract i i Tabl e o-f Con tents i i i List o-f Tabl es v List of Figures vi List of Appendices vii 1 Introduction 1-3 1 . 1 Background 1 1.2 Previous Angler Catch and Use Surveys 3 1 .3 Obj ectives 3 2 Methods 4-10 2.1 Survey Design and Operation 4 2.1.1 Survey Design and Operation at Ross Reservior (Area 1) " 4 2.1.2 Survey Design and Operation at the Lower Canadian Skagit and Klesilkwa Rivers (Area 2) 7 2.1.3 Survey Design and Operation at the Upper Canadian Skagit and Sumallo Rivers (Area 3) 7 2.2 Survey Information Collected 7 2.3 Survey Data Management and Analysis 8 2.4 Rainbow Trout Tagging Studies 9 3 Ross Reservoir Results 11-20 3.1 Fishing Conditions at Ross Reservoir 11 3.2 Angler Effort at Ross Reservoir 11 3.2.1 Estimated Total Angler Effort at Ross Reservoir 11 3.2.2 Temporal and Spatial Distribution of Angler Effort at Ross Reservoir 11 3.2.3 Ross Reservoir Angler Profile 13 3.3 Angler Catch Characteristics at Ross Reservoir 14 3.3.1 Estimated Total Catch, Harvest and Angler Success at Ross Reservoir 14 3.3.2 Angler Catch Locations and Fish Size at Ross Reser vo i r 14 4 Canadi an Skaoit River Results 21—30 4.1 Fishing Conditions at the Canadian Skagit River 21 4.2 Angler Effort at the Canadian Skagit River 21 4.2.1 Estimated Total Angler Effort at the Canadian Skagi t Ri ver 21 4.2.2 Temporal and Spatial Distribution of Angler Effort at the Canadian Skagit River 21 4.2.3 Canadian Skagit River Angler Profile 23 4.3 Angler Catch Characteristics at the Canadian Skagit River 24 4.3.1 Estimated Total Catch, Harvest and Anger Success at the Canadian Skagit River 24 4.3.2 Rainbow Trout Catch Locations and Fish Size at the Canadian Skagit River 24 i V Table o-f Contents con't Page 5 Rainbow Trout Tagging Studies, 1985 31 6 Discussion 31 7 Recofnmendat i ons 33 8 Literature Cited 34 Acknowledgements 35 Append i ces V List of Tables Page Estimated angler e-f-fort on Ross Reservoir -from June 14 to October 31, 1985. 12 Estimated total numbers o-f trout and char harvested and released by anglers -fishing Ross Reservoir between June 14 and October 31, 1985. 15 Estimated angler catch rates -for rainbow trout -from Ross Reservoir -from June 14 to October 31, 1985. 16 Estimated angler catch rates -for Dolly Varden char -from Ross Reservoir -from June 14 to October 31, 1985. 17 Estimated angler catch rates -for brook trout -from Ross Reservoir -from June 14 to October 31, 1985. 18 Estimated angler catch rates for cutthroat trout from Ross Reservoir from June 14 to October 31, 1985. 18 Estimates of total angler effort in the Skagit River trout fishery from June 14 to September 30, 1985. 22 Estimates of total numbers of trout and char harvested and released by anglers fishing in the Skagit River from June 14 to September 30, 1985. 25-27 Estimates of angler catch rates for trout and char in the Skagit River fishery from June 14 to September 30, 1985. 28 V I List o-f Figures Page The Ross Reservoir and Canadian Skagit River angler survey study area, 1985. 2 Survey zones on Ross Reservoir (Area 1), 1985. 5 Survey zones (Zone 1, etc.) and catch location index (F7, F13, etc.) used during angler surveys on the Canadian Skagit River (Areas 2 and 3), 1985. 6 Spatial distribution o-f the rainbow trout catch reported by anglers at Ross Reservoir, June 14 to October 31, 1985. 19 Length -frequency distribution -for rainbow trout harvested by anglers at Ross Reservoir, June 14 to October 31, 1985. 19 Spatial distribution o-f the Dolly Varden char catch reported by anglers at Ross Reservoir, June 14 to October 31, 1985. 20 Length -frequency distribution -for Dolly Varden char- harvested by anglers at Ross Reservoir, June 14 to October 31, 1985. " 20 Spatial distribution o-f the rainbow trout catch reported by anglers at the Canadian Skagit River, June 14 to September 30, 1985 (refer to Fig. 3 for catch location i ndex). 30 Length frequency distribution for rainbow trout harvested by anglers at the Canadian Skagit River, 1985. 30 Temporal and spatial distribution of Floy anchor tags recovered from Ross Reservoir, 1985. 32 v i i L i 5t o-f Appendices Size limits and daily catch quotas for Ross Reservoir and the Canadian Skagit River, 1985. Survey schedule for 1985 angler surveys at Ross Reservoir and the Canadian Skagit River. Example of the data sheet used during 1985 angler surveys at Ross Reservoir and the Canadian Skagit River. Summary of Floy anchor tags appl ied to rainbow trout in the Can ad i an Skagit River during spring and summer, 1985. Summary of physical data, Canadian Skagit and Sumallo River, 1 985. Floy anchor tags recovered from Ross Reservoir and the Canadian Skagit River from all sources durino the summer and fal1, 1985. 1 1.0 INTRODUCTION 1.1 Background Ross Reservoir and the Canadian Skaait River, located approximately 40 km southeast of Hope. B.C., support popular recreational -fisheries -for rainbow trout (Salmo qairdneri) and Dolly Varden char (Salvelinus malma) and to a lesser extent brook trout (Salvelinus fontinalis) and cutthroat trout (Salmo clarKi) throughout the summer and early -fall (Fig. 1). Rainbow trout and Dolly Varden char move -freely between the reservoir and river and display intricate li-fe histories that show a dependence on both these environments. In recent years, it is reported that the numbers and size o-f trout caught in the Canadian Skagit River and Ross Reservoir have declined. The management objective o-f Ministry o-f Environment (MOE) and Washington Department o-f Game (WDG) is to protect, maintain and i-f possible enhance these -fisheries without stocking (R. Neuman, pers. comm.). Even though the river and reservoir aquatic systems and -fishery resources are closely related, there are di-f-ferences between American and Canadian -fishery management regulations. For example, regulations for the Canadian portion of Ross Reservoir are four trout per day with no minimum length. The 1986 American regulations for Ross Reservoir will be eight trout, no more than three over fourteen inches (35.6 cm), and no minimum length. The reported decline in size and numbers of trout in Ross Reservoir and the Canadian Skagit River, the interelationship of the fishery resource of the two systems, and the differing regulations on each side of the international boundary, have required that MOE and WDG conduct a joint fishery and fish assessment study.
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