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Abundance of Sport Fish in the North Raven River, Alberta, 2005

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Abundance of Sport Fish in the North Raven River, Alberta, 2005 Abundance of Sport Fish in the North Raven River, Alberta, 2005 CONSERVATION REPORT SERIES The Alberta Conservation Association is a Delegated Administrative Organization under Alberta’s Wildlife Act. CONSERVATION REPORT SERIES 25% Post Consumer Fibre When separated, both the binding and paper in this document are recyclable Abundance of Sport Fish in the North Raven River, Alberta, 2005 Mike Rodtka1 and Rocklyn Konynenbelt2 1Alberta Conservation Association Provincial Building 4919 – 51 Street Rocky Mountain House, Alberta, Canada T4T 1A3 2Alberta Sustainable Resource Development Provincial Building 4919 – 51 Street Rocky Mountain House, Alberta, Canada T4T 1B3 Report Editors PETER AKU KELLEY KISSNER Alberta Conservation Association 50 Tuscany Meadows Cres NW #101, 9 Chippewa Rd Calgary, AB T3L 2T9 Sherwood Park, AB T8A 6J7 Conservation Report Series Type Data ISBN printed: 978‐0‐7785‐7729‐4 ISBN online: 978‐0‐7785‐7730‐0 Publication No.: T/198 Disclaimer: This document is an independent report prepared by the Alberta Conservation Association. The authors are solely responsible for the interpretations of data and statements made within this report. Reproduction and Availability: This report and its contents may be reproduced in whole, or in part, provided that this title page is included with such reproduction and/or appropriate acknowledgements are provided to the authors and sponsors of this project. Suggested Citation: Rodtka, M., and R. Konynenbelt. 2008. Abundance of sport fish in the North Raven River, Alberta, 2005. Data Report, D‐2008‐005, produced by the Alberta Conservation Association, Rocky Mountain House, Alberta, Canada. 20 pp + App. Cover photo credit: David Fairless Digital copies of conservation reports can be obtained from: Alberta Conservation Association #101, 9 Chippewa Rd Sherwood Park, AB T8A 6J7 Toll Free: 1‐877‐969‐9091 Tel: (780) 410‐1998 Fax: (780) 464‐0990 Email: info@ab‐conservation.com Website: www.ab‐conservation.com i EXECUTIVE SUMMARY The North Raven River (NRR), also know as Stauffer Creek, has long been regarded as one of Alberta’s finest trout streams. Located in west‐central Alberta, Canada, the primary land use in the area is agricultural. By the 1960s it had become apparent that the effects of agricultural and rural development were negatively impacting the stream. The “Stauffer Creek Habitat Improvement Program”, developed by the Alberta Fish and Wildlife Division in 1973, outlined a plan to initiate habitat protection and improvement, while monitoring changes in the NRR’s physical characteristics and fish populations. This monitoring included trout abundance estimation in 1973, 1985, 1995 and 2005 at four study sections along the NRR using electrofishing gear. Our report presents data on trout abundance from the 2005 study, and summarizes past survey data for comparison. We estimated trout abundance via mark‐recapture surveys at the four study sections previously surveyed using methods comparable to those used in past surveys. Mean brook trout abundance in the upper NRR fluctuated from an estimated low of 37 fish/km (95% CL = 28 – 51) in 1995 to a high of 193 fish/km (95% CL = 159 – 242) in 1985. Brown trout abundance fluctuated from a low of 124 fish/km (95% CL = 103 – 151) in 1973 to a high of 744 fish/km (95% CL = 693 – 806) in 1985. Since 1995, brook trout abundance in the NRR appears to have increased, whereas brown trout abundance has decreased. Mean biomass of trout in the study area ranged from an estimated low of 25.4 kg/km (95% CL = 20.8 – 31.4) in 1973 to a high of 86.0 kg/km (95% CL = 75.8 – 99.0) in 1995. Brook trout biomass in the upper NRR ranged from an estimated low of 2.2 kg/km (95% CL = 1.5 – 3.3) in 1995 to a high of 7.2 kg/km (95% CL = 5.7 – 9.5) in 1985. Brown trout biomass was lowest in 1973 at 20.7 kg/km (95% CL = 16.1 – 26.7) and peaked at 83.8 kg/km (95% CL = 73.7 – 97.0) in 1995. Since 1995, brook trout biomass appears to have increased, whereas brown trout biomass appears to have decreased. The size (length) structure of brook trout and brown trout catches varied among survey years. The brook trout catch in 2005 was composed of significantly larger fish than in 1995 (P < 0.0001), although condition did not differ between years. The brown trout catch in 2005 was composed of significantly smaller fish than in 1995 (P < 0.0001); approximately 50% of the 2005 catch was of fish ≤ 100 mm fork length. No clear trend ii in condition of brown trout was apparent since 1995. Generally, fish condition tended to decrease with increasing abundance among survey years, and tended to decrease with increasing fish length for both species across years. The most striking trend in the dataset was the general increase in trout biomass which has occurred since riparian habitat conservation and stream improvement initiatives began in the early 1970s. The 2005 survey results indicated that trout abundance and biomass in the upper NRR declined since 1995, but were still well above the lows in abundance and biomass documented in 1973. It appears the most recent decline in trout abundance and biomass has been driven by a reduction in brown trout abundance and biomass, which accounts for the greatest proportion of trout biomass in the stream. Evaluation of long‐ term changes in abundance and biomass of trout in the study area are complicated by a lack of consecutive‐year trend data. It remains unclear whether changes in abundance and biomass observed in the most recent survey were indicative of a long‐term trend or were an artifact from limited sampling of a dynamic system. Key words: abundance, biomass, brook trout, brown trout, North Raven River. iii ACKNOWLEDGEMENTS We thank Kevin Gardiner, Kevin Fitzsimmons and Donna Rystephanuk (Alberta Conservation Association) and Steve Herman (Alberta Sustainable Resource Development) for assistance with field work. Susan Armitage graciously volunteered her time to assist with field work. Mike Sullivan (Alberta Sustainable Resource Development), Craig Johnson, Calvin McLeod, Garry Scrimgeour (Alberta Conservation Association) and Kevin Fitzsimmons provided input into data analyses. Donna Rystephanuk created study area maps. We sincerely thank area landowners and the numerous individuals and conservation organizations who, through their vision and hard work, have helped make the North Raven River the fishery it is today. iv TABLE OF CONTENTS EXECUTIVE SUMMARY.......................................................................................................... ii ACKNOWLEDGEMENTS....................................................................................................... iv TABLE OF CONTENTS ............................................................................................................ v LIST OF FIGURES..................................................................................................................... vi LIST OF APPENDICES ........................................................................................................... vii 1.0 INTRODUCTION ..........................................................................................................1 1.1 Study objective...........................................................................................................2 2.0 STUDY AREA.................................................................................................................3 2.1 Description .................................................................................................................3 3.0 MATERIALS AND METHODS ...................................................................................5 3.1 Data handling.............................................................................................................5 3.2 Trout abundance estimation ....................................................................................5 3.3 Trout biomass estimation .........................................................................................6 3.4 Fish condition and population size structure........................................................7 4.0 RESULTS .........................................................................................................................8 4.1 Trout abundance........................................................................................................8 4.2 Trout biomass...........................................................................................................10 4.3 Fish condition and population size structure......................................................12 4.4 Summary...................................................................................................................16 5.0 LITERATURE CITED ..................................................................................................18 6.0 APPENDICES...............................................................................................................21 v LIST OF FIGURES Figure 1. Location of the North Raven River (NRR) study area in Alberta, Canada and the four study sections of the NRR assessed in 2005................................. 4 Figure 2. Weighted mean estimate of brook trout abundance derived from mark‐ recapture surveys at four sections of the upper North Raven River in 1973, 1985, 1995 and 2005.. .............................................................................................. 9 Figure 3. Weighted mean estimate of brown trout abundance derived from mark‐ recapture
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