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1993 Wannock River Chinook Salmon Mark-Recapture Experiment

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1993 Wannock River Chinook Salmon Mark-Recapture Experiment p2e f - "?? 5 ' 17 Scientific Excellence • Resource Protection & Conservation • Benefits for Canadians ele—ndeExcellence scientifique • Protection et conservation des ressources • Bénéfices aux Canadiens Bibliothèque pro - Libra y mPo 11111 111 12022706 1993 Wannock River Chinook Salmon Mark-Recapture Experiment I. Winther Department of Fisheries and Oceans Operations Branch Prince Rupert, B.C. V8J 1G8 March 1995 tf Canadian Manuscript Report of Fisheries and Aquatic Sciences No. 2280 r 5S / Fisheries Pêches 1+1 and Oceans et Océans Canadd. Canadian Manuscript e eport of Fisheries and Aquatic Sciences Manuscript reports contain scientific and technical information that contributes to existing knowledge but which deals with national or regional problems. Distribu- tion is restricted to institutions or individuals located in particular regions of Canada. H owever, no restriction is placed on subject matter, and the series reflects the broad interests and policies of the Department of Fisheries and Oceans, namely, fisheries and aquatic sciences. Manuscript reports may be cited as full publications. The correct citation appears above the abstract of each report. Each report is abstracted in Aquatic . Sciences and Fisheries Abstracts and indexed in the Department's annual index to scientific and technical publications. Numbers 1-900 in this series were issued as Manuscript Reports (Biological Series) of the Biological Board of Canada, and subsequent to 1937 when the name of the Board was changed by Act of Parliament, as Manuscript Reports (Biological Series) of the Fisheries Research Board of Canada. Numbers 901-1425 were issued as Manuscript Reports of the Fisheries Research Board of Canada. Numbers 1426-1550 were issued as Department of Fisheries and the Environment, Fisheries and Marine Service Manuscript Reports. The current series name was changed with report number 1551. Manuscript reports are produced regionally but are numbered nationally. Requests for individual reports will be filled by the issuing establishment listed on the front cover and title page. Out-of-stock reports will be supplied for a fee by commercial agents. Rapport manuscrit canadien des sciences halieutiques et aquatiques Les rapports manuscrits contiennent des renseignements scientifiques et techni- ques qui constituent une contribution aux connaissances actuelles, mais qui traitent de problèmes nationaux ou régionaux. La distribution en est limitée aux organismes et aux personnes de régions particulières du Canada. Il n'y a aucune restriction quant au sujet; de fait, la série reflète la vaste gamme des intérêts et des politiques du ministère des Pêches et des Océans, c'est-à-dire les sciences halieutiques et aquatiques. Les rapports manuscrits peuvent être cités comme des publications complètes. Le titre exact paraît au-dessus du résumé de chaque rapport. Les rapports manuscrits sont résumés dans la revue Résumés cles sciences aquatiques et halieutiques, et ils sont classés dans l'index annuel des publications scientifiques et techniques du Ministère. Les numéros I à 900 de cette série ont été publiés à titre de manuscrits (série biologique) de l'Office de biologie du Canada, et après le changement de la désignation de cet organisme par décret du Parlement, en 1937, ont été classés comme manuscrits (série biologique) de l'Office des recherches sur les pêcheries du Canada. Les numéros 901 à 1425 ont été publiés à titre de rapports manuscrits de l'Office des recherches sur les pêcheries du Canada. Les numéros 1426 à 1550 sont parus à titre de rapports manuscrits du Service des pêches et de la mer, ministère des Pêches et de l'Environne- ment. Le nom actuel de la série a été établi lors de la parution du numéro 1551. Les rapports manuscrits sont produits à l'échelon régional, mais numérotés à l'échelon national. Les demandes de rapports seront satisfaites par l'établissement auteur dont le nom figure sur la couverture et la page du titre. Les rapports épuisés seront fournis contre rétribution par des agents commerciaux. Canadian Manuscript Report of Fisheries and Aquatic Sciences No. 2280 March 1995 1993 Wannock River Chinook Salmon Mark-Recapture Experiment by 1. Winther Department of Fisheries and Oceans Operations Branch Prince Rupert, B.C. V8J-1 G8 ii e Minister of Supply and Services Canada 1995 Cat. No. Fs 97-4/2280E ISSN 0706-6473 Correct citation for this publication: Winther, I. 1995. 1993 Wannock River chinook salmon mark-recapture experiment. Can. Manuscr. Rep. Fish. Aquat. Sci. 2280: 52 p. iii ABSTRACT Winther, I. 1995. 1993 Wannock River chinook salmon mark-recapture experiment. Can. Manuscr. Rep. Fish. Aquat. Sci. 2280: 52 p. A mark-recapture experiment was implemented in 1993 as part of the continued assessment of chinook salmon (Onchorynchus tshawytscha) escapements to the Wannock River. The escapement of female chinook salmon to the Wannock River in 1993 was estimated at 9300 to 9500 using Bayesian techniques. Length, age and fin clip information are presented. RESUME Winther, I. 1995. 1993 Wannock River chinook salmon mark-recapture experiment. Can. Manuscr. Rep. Fish. Aquat. Sci. 2280: 52 p. Une expérience de capture-recapture a été effectuée en 1993, dans le cadre du programme d'évaluation des échappées de saumon quinnat (Onchorynchus tshawytscha) dans la rivière Wannock. En 1993, on a estimé que le nombre d'échappées de quinnats femelles dans la rivière Wannock se situait entre 9 300 et 9 500 (méthodes bayesiennes). L'étude donne de l'information sur la taille, l'âge et le rognage des nageoires. iv TABLE OF CONTENTS Abstract/Resume Introduction 1 Methods 1 Results 4 Discussion 8 References 9 List of Tables: Table 1. Seine catch 10 Table 2. Sexual composition of chinook samples. 11 Table 3. Chinook length frequency summary. 12 Table 4. Chinook recoveries by treatment before release 11 Table 5. Chinook recoveries by number of seine recaptures 11 Table 6. Chinook recoveries by dead pitch area. 13 Table 7. Chinook recoveries by week of mark application. 13 Table 8. Chinook recoveries by week of dead pitch. 14 Table 9. Recovery matrix, week of mark application verses week of dead pitch. 14 Table 10. Length at age data for chinook samples. 15 Table 11. Age data from coded wire tag recoveries 16 Table 12. Incidence of chinook fin clips 17 Table 13. Egg retention in female dead pitch recoveries. 17 List of Figures: Figure 1. Wannock River, Rivers Inlet, British Columbia 18 Figure 2. Population posterior probability distributions. 19 Figure 3. Comparison of female chinook POH length frequency distributions from seine caught and dead pitched samples 20 Figure 4. Comparison of male chinook POH length frequency distributions from seine caught and dead pitched samples 21 Figure 5. Wannock River water levels and secchi disk depth 22 List of Appendices: Appendix 1. Chinook marking data. 23 Appendix 2. Chinook dead pitch data. 36 Appendix 3. Data for chinook mark recoveries 46 Appendix 4. Weather and water conditions. 48 1 INTRODUCTION The Canadian Department of Fisheries and Oceans committed to halting the decline of chinook salmon stocks in 1985 as part of the Pacific Salmon Treaty. The Pacific Salmon Commission Joint Chinook Technical Committee described Rivers Inlet as an "escapement indicator stock" for evaluation of the Pacific Salmon Treaty Chinook Rebuilding Program (Anon. 1991). The Wannock River is the largest contributor to the Rivers Inlet chinook stock complex with significant impact on stock trends in the area (Winther 1992). Rivers Inlet chinook are important locally as the target of a large sport fishery. They also contribute to Native and commercial fisheries. The Oweekeno Band has been involved in enhancement of chinook salmon since 1983 through the Community Economic Development Program of the Department of Fisheries & Oceans. Chinook enhancement takes place at the Owikeno Salmonid Enhancement Program facility on the Wannock River, at the Snootli Hatchery in Bella Coola and in net pens in Rivers Inlet. This report details the third year of live marking and carcass recovery to determine the size of the Wannock River chinook stock. Winther (1992, 1993) reported mark- recapture experiments to determine chinook escapements in 1991 and 1992. The objective of this series of mark-recapture experiments is to ultimately determine stock trends and provide a measure of the enhanced component of the stock. METHODS Mark Application Chinook were captured from the Spring Pool of the Wannock River with a beach seine 84 m long and 10 m deep. Seining took place on 19 days between September 30 and October 25, 1993. Winther (1993) describes the beach seining procedure. Date, weather, river level and secchi disk depth data were recorded each sample day. Time, set and catch data were recorded on waterproof forms. Chinook marking and sampling procedures were similar to those carried out in 1992 (Winther 1993). All chinook were measured for post orbital to hypural plate (POH) length, sexed by external morphology, and checked for fin clips. Comments were recorded on the presence of hooks, fungal growth or seal scars. All chinook released received an individually numbered Kurl Lock tag and a 7 mm hole to the left operculum. Condition on release was noted as good, required resuscitation, bleeding, or spawned out. Set number, tag number, POH length, sex, condition, and fin clip data were recorded for each new fish encountered. Only set number and tag number were recorded for recaptured fish. New tags were applied to fish recaptured with an opercular punch but missing the original tag. - 2 Adipose clipped chinook less than 65 cm POH length were kept for coded wire tag (CVVT) sampling. CVVT sampling consisted of measuring POH length, collecting scales and collecting the head. Scales were forwarded to the Fish Morphology Laboratory in Vancouver for ageing and heads were forwarded to the Snootli Hatchery in Bella Coola for dissection and CWT identification. Chinook were collected to provide broodstock to hatchery programs. Broodstock chinook were sampled for POH length, fin clips, scales, and incised to determine sex.
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