2002/03 Preliminary Assessment of Stuart Watershed White Sturgeon (Acipenser Transmontanus
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2002/03 Preliminary Assessment of Stuart Watershed White Sturgeon (Acipenser transmontanus Prepared by the Carrier Sekani Tribal Council 2ndFloor, 1460 Sixth Ave. Prince George, B.C. V2L 3N2 June 2003 Prepared For The NEC~iW~ WHITESTURGEON .,. RECOVERY INITIATIVE - - 2002/03 Preliminary Assessment of Stuart Watershed White Sturgeon (Acipenser transmontanus Prepared For The NEC~~~~ WHITESTURGEON RECOVERY INITIATIVE cIa Don Cadden, R.P.8io., Chair, NWSRI Recovery Team Section Head, Fish &Wildlife Science & Allocation Environmental Stewardship Division Ministry of Water, land & Air Protection 405118-th Ave. Prince George BC, V2N 183 Prepared by the Carrier Sekani Tribal Council 2ndFloor, 1460 Sixth Ave. Prince George, B.C. V2L 3N2 Brian M.Toth, R.P.Bio.1and Jason A. Yarmish2 1 Carrier Sekani Tribal Council, 2ndFloor, 1460 Sixth Ave., Prince George, B.C., V2L 3N2 2 Lheidli T'enneh Band, Natural Resource Office, #105 2288 Old Cariboo Hwy., V2N 6G3 - ---- Carrier Sekani TribalCouncil Nechako White Sturgeon Recovery Initiative Habitat Conservation Trust Fund Acknowledaements The 2002/03 Preliminary Assessment of Stuart Watershed White Sturgeon was a culmination of the efforts of numerous persons. Dennis Ableson, former CSTC Fisheries Program Biologist, provided the initial impetus for initiating this undertaking. Golder Associates Ltd. completed a multi-year study design for the program and provided overall scientific direction to the activities undertaken in 2002/03, including field staff training and reviewing drafts of this report. Members of the Recovery Team of the Nechako White Sturgeon Recovery Initiative provided recommendations as to the format of the study as well as providing funding for the initiative through the Habitat Conservation Trust Fund (HCTF). The Carrier Sekani Tribal Council provided funding for the project and administered funds received from the Ministry of Water, Land and Air Protection (MoWLAP) through the (HCTF). Marcel Shepert (CSTC) coordinated CSTC staff management and financial administrative functions. Don Cadden (MoWLAP) coordinated overall project administration and direction. Barry Huber (DFO) facilitated the use CSTC's Aboriginal Fisheries Strategy Funding for training related to this project. Jason Yarmish (Lheidli T'enneh), Corey Stefura (Golder), (Golder), James (Jaco) Prince (CSTC) and Albert Raphael (CSTC) conducted all field sampling. The Lheidli T'enneh Band provided the services of fisheries biologist Jason Yarmish and the use of a jet boat and sturgeon sampling gear. The efforts of all persons that contributed to the initiation of the first year of this undertaking are greatly appreciated. 2002/03 Preliminary Assessment of Stuart Watershed White Sturgeon Page. i --- --- Carrier Sekani TribalCouncil Nechako White Sturgeon Recovery Initiative Habitat Conservation Trust Fund Item pg. Acknowledgements . i List of Tables.......................................................................................... iii List of Figures........................................................................................ iii List of Appendices.................................................................................. iii Executive Summarv .... 1 Introduction and Background................................................................... 2 Study Area .................... 2 Background ... 3 Purpose .. 4 Methodology . 5 Angling ... 6 Setli ne. .. .. .. .. 6 Setline Deployment and Retrieval; Stuart River........................................... 7 Setline Deployment and Retrieval; Stuart Lake........................................... 7 Sturgeon Handling and External Data Collection......................................... 8 Internal Examinations and Tag Implantation............................................... 10 Tracking of Tagged Sturgeon ..... 10 Aging Analysis....................................................................................... 12 Results .... 12 Stuart River Sampling Summary ........... 12 Stuart Lake Sampling Summary ...... 13 Captured Sturgeon. ... ... ... ... ... ... ... ... .... 13 Catch Per Unit Effort ....... 15 By-Catch . 15 Acoustic Telemetry on Stuart Lake ........... 16 October 15 -17 Acoustic Telemetrv Session.......................................... 16 November 4 - 5 Acoustic Telemetrv Session.......................................... 16 Discussion and Conclusions ...... 17 2002 Sampling Results ....... 17 Factors affecting CPUE; Stuart River..................................................... 18 Factors affecting CPUE: Stuart Lake...................................................... 19 Recapture Information ... ... ....... 20 Anecdotal and Historical Information ......................................................... 22 Acoustic Tracking.. ....... 23 Recommendations .. 23 References Cited ...... 25 2002/03 Preliminary Assessment of Stuart Watershed White Sturgeon Page. ii Carrier Sekani TribalCouncil Nechako White Sturgeon Recovery Initiative Habitat Conservation Trust Fund List of Tables No. Title Pg. 1 External measurements taken from each captured sturgeon sampled in 2002, 9 and the specific techniques for taking measurements. 2 Description of "Sexual Maturity Codes" utilized to classify the status of gonad 11 development, as applied to sturgeon sampled within the Stuart study area in 2002. 3 General information regarding sturgeon captured in the Stuart River and Stuart 14 Lake in 2002. 4 Summary of sampling effort and respective CPUE within the 2002 Stuart 15 watershed program. 5 Summary of incidental species captured. 15 6 Comparative statistics for the 3 sturgeon recaptured in 2002 which possessed 21 identifying tags. List of Figures No. Title Pg. 1 11x17 map of Stuart Basin (Takla Lake to Nechako) btw. 2-3 2 e-size plot of Stuart Lake and Stuart River with sampling and capture location btw. information 18-19 3 Maximum detectable range of the CART tags with a fixed gain of 75 on the App.5 Lotek receiver and over a range of water depths. pg. 2 4 Maximum distance to code out CART tag through range of "Gains" and App.5 depths pg. 3 btw.- between,App.- appendix List of Appendices N~ T~~ 1 Data forms utilized for recording all sampling information in 2002. 2 Data forms relating to Stuart River sampling in 2002. 3 Data forms relating to Stuart Lake sampling in 2002. 4 Summary of information relating to sturgeon captured in 2002 and associated by-catch of other species. 5 Report on trials related to CART tag/acoustic signal detection over a range of depths and distances from hydrophone and receiver. 2002/03 Preliminary Assessment of Stuart Watershed White Sturgeon Page. iii -- - Carrier Sekani Tribal Council Nechako White Sturgeon Recovery Initiative Habitat Conservation Trust Fund Executive SUmmary Funding to conduct this assessment of white sturgeon (Acipenser transmontanus) within the Stuart River watershed was provided by the Habitat Conservation Trust Fund through the Nechako River White Sturgeon Recovery Initiative (NWSRI) and the Carrier Sekani Tribal Council (CSTC). Field sampling was initiated the 3rd of September and involved the application of sampling methodologies analogous to those applied in similar assessment work in other portions of the Fraser and Columbia watersheds in the last decade. Sampling was carried out in the Stuart River from several kilometers below the Mandala~ Creek confluence to the river's outlet from Stuart Lake during September 3rd_11t and 29th_30th. Sampling within Stuart Lake was conducted utilizing a systematic approach of setline application from September 10th-28thfrom Fort St. James to the Tachie River, focusing on the western half of the lake. The two gear types deployed in the Stuart River included angling and setlines. In Stuart Lake, setlines were the only method of sampling utilized. Baits utilized included sockeye, kokanee, and pickled squid. Sampling was based on the study design developed on behalf of the CSTC by RL&L Environmental (now Golder Associates Ltd.). The primary objective of the 2002 study was to sample the greatest range of habitats possible, documenting juvenile and adult sturgeon usage of these areas, collecting basic morphological and sexual development information, and deploying tags that emit radio and/or acoustic signals to fish of appropriate characteristics to allow their future tracking. This work was conducted as portion of the recovery efforts identified for pursuit by the Recovery Team of the NWSRI. Information relating to the linkage and relationship of white sturgeon within the Stuart and Nechako systems is considered potentially fundamental to the direction of recovery efforts being developed for the Nechako white sturgeon stock. Sampling efforts on the Stuart River included 16 hours of angling and 38 setline sets amounting to 12,356.1 hook-hours of setline effort. Effort in Stuart Lake included a total of 58 setline sets that totalled 28,394.3 hook-hours of setline effort. A total of six sturgeon were captured during the course of setline sampling; two in the Stuart River {Total Length (TL) 167cm and 213cm} and 4 in Stuart Lake (TL 157-273cm). Both fish captured in the Stuart River had been previously captured during sampling carried out between 1995 and 1999 on the Nechako River. As well, 2 of the 4 sturgeon captured in Stuart Lake were also recaptures from the same program. Sturgeon were sampled for all external morphological parameters, tagged with FLOY and Pit tags, four were examined internally to assess sex/maturity status and implanted with tags emitting radio