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Status of Atlantic Salmon Stocks of the Margaree and Other Selected Rivers of Cape Breton Island, 1995

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Status of Atlantic Salmon Stocks of the Margaree and Other Selected Rivers of Cape Breton Island, 1995 Not to be cited without Ne pas citer sans permission of the authors ' autorisation des auteurs' DFO Atlantic Fisheries MPO Pêches de l'Atlantique Research Document 96/142 Document de recherche 96/142 Status of Atlantic salmon stocks of the Margaree and other selected rivers of Cape Breton Island, 199 5 by T.L. MarshafT Department of Fisheries & Oceans Science Branch, Maritimes Regio n P.O . Box 550 Halifax, N .S. B3J 2S7 and R. Jones, P. LeBlanc, and L. Forsyth Department of Fisheries & Oceans Science Branch, Maritimes Region P.O. Box 5030 Moncton, N .B, E1 G 9B6 'This series documents the scientific basis 'La présente série documente les bases for the evaluation of fisheries resources in scientifiques des évaluations des ressources Atlantic Canada. As such, it addresses the halieutiques sur la côte Atlantique du issues of the day in the time frames required Canada. Elle traite des problèmes courants and the documents it contains are not selon les échéanciers dictés . Les documents intended as definitive statements on the qu'elle contient ne doivent pas être subjects addressed but rather as progress considérés comme des énoncés définitifs sur reports on ongoing investigations . les sujets traités, mais plutôt comme des rapports d'étape sur les études en cours. Research documents are produced in the Les documents de recherche sont publiés official language in which they are provided dans la langue officielle utilisée dans le to the secretariat . manuscrit envoyé au secrétariat . 2 TABLE OF CONTENTS Page Abstract ...... .. .. .. .. .. .. .. .. .. .. .......... .. ........... .. .. .. .. .. .. .. .. .. .. ............ ........... .. .. .. .. .. .. .. .. .. .. ........ .. .. ........... .. .. .. .. ............. .. .. .. 3 Summary Sheets ... .. .. .. .... .. .. .. .. .. .... .. .. .. .. ........... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ........... .. .......... .. .. .. .. ........... .. .. .. .. .. .. .. .. .. .. ....... 4 Introduction Description of Fisheries ...... .... .. .. .. .. .. .. .. .. .. .. ........... .. .. .. ...... .. .. .. .. .. .. .. .. .. .. ........... ............ .. .. .. .. ....................... .. 7 Fishery Data. .. .. ...... .. .. .. ........... .. .. .. .... .. .. .. .. .. .... .. .. .. .. ........... .. .. .. ...... .. .. .. .. .. .. .. .. .. .. ........... .. .. .. .. .. .. .. .. .. .. ........... .. 8 Margaree Rive r Estimation/ Estimates of Returns ................... .. .. .. .. .. .. .. .. .. .. ....................... .. .. .. .. .. .. .. .. .. .. ........... .. .. .. .. .. .. .. .. .. .. .. 9 Conservation Requirements .. .. .. .. .... .. .. ........... .. .. .. .. .. .. .. .. .. .. ...... .. .. .. ........... .:......... .. .. .. .. ....................... .. .. .. ..16- Escapement/ Juveniles .... .. .. .. .. .. .. .. .. .. .. ........ .. .. .......... .. .. .. .. .. .. .. .. .. .. .. .... .. .. .. ........... .. .. .. .. .. .. .. .. .. .. ........... .. .. .. ..16 Forecasts .. .. .. .. .. .. .. ........... .. .. ........ .. .. .. .. .. .. .. .. .. .. ........... .. .. ........ .. .. .. .. .. .. .. .. .. .. ....................... .. .. .. .. ........... .. .. .. ..1 7 Middle Rive r Estimation/ Estimates of Returns . ........... .. .. .. .. .. .. .. .. .. .. ............ ........... .. .. .... .... .. .. .. .. ....................... .. .. .. .. .......18 Conservation Requirements . .. .. .. .. ........... .. .. .. ...... .. .. .. .. .... .. .. .. .. ........... ............ .. .. .. .. .. .. .. .. .. .. ........... .. .. .. .. .......19= Escapement/ Juveniles . .. .. .... .. .. .. .. ...... .. .. .. ........... .. .. .. .. .... .. .. .. .. ...... .. .. .. ........... .. .......... .. .. .. .. ........... .. .. .. .. .. .... .19 Forecast . .. .. .. .. ............... ........ .. .. .. .. .. .. .. .. .. .. ........... .. .......... .. .. .. .. .. .. .. .. .. .. .......... .. ........... .. .. .. .. .......... .. ........... .. 20 Baddeck Rive r Estimation/ Estimates of Returns ................. .. .. .. .. .. .. .. .. .. .. ............ ........... .. .. .. .. .. .. .. .. .. .. ........... .. .. .. .. .. .. ........ ..20 Conservation Requirements .. ...... .. .. .. ........... .. .. .. .. .. .. .. .. .. .. ........ .. .. ........... .. .. ........ .. .. .. .. ........... ............ .. .. .. .. .. 21 Escapement ....... .... ........ .. .. .. .. .. .. .. .. .. .. ........... .. .......... .. .. .. .. .. .. .. .. .. .. ........ .. .. ........... .. .. .. .. .. .. .. .. .. .. ........... .. .. .. .. .. 21 Forecast .. .... .... .. .. ........... .. .. .. ...... .. .. .. .. .. .. .. .. .. .. ........... .. .. ........ .. .. .. .. .. .. .. .. .. .. ........... .. .. ........ .. .. .. .. ........... .. .. .. .. .. 22 North River Estimation/ Estimates of Returns .......... .. .. .. .. .. .. .. .. .. .. ...... ...... ........... .. .. .. .. .. .. .. .. .. .. ....................... .. .. .. .. .........22 Conservation Requirements . .. .. .. ........... .. .. ........ .. .. .. .. .. .. .. .. .. .. .......... ............ .. .. .. .. .. .. .. .. .. .. ........... .. .. .. .. .. .. .. .. .24 Escapement. ........... .. .. .. ...... .. .. .. .. .. .. .. .. .. .. ........... .. .. .. .. .... .. .. .. .. .. .. .. .. .. .. ........... .. .......... .. .. .. .. ........... .. .. .... .... .. .. 24 Forecast . .. .. .. .......... .. ........... .. .. .. .. .... .. .. .. .. ...... .. .. ............ .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .......... .. .. .. .. .. .. .. .. .. .. ........... .. .. 24- Sydney River Estimation/ Estimates of Returns .. .. .... ...... .. .. .. .. .. .. .. .. .. .. ............ ........... .. .. .. .. .... .. .. .. .. ........... .. .. .. .. .. .. .. .. .. .. ....25 Conservation Requirements .... .. .. .. .. ........... .. .. .... .... .. .. .. .. .. .. .. .. .. .. ....................... .. .. .. .. .. .... .. .. ... .... ...... .. .. .. .. ....25 Escapement ..... ............ .. .. .. .. .. .. .. .. .. .. .......... .. ........... .. .. .. .. .. .. .. .. .. .. ........ .. .. ........... .. .. .. .. .. .. .. .. .. .. ........... .. .. .. .. .. .. 26 Forecast ........ .. .. ........... .. .. .. ...... .. .. .. .. .. .. .. .. .. .. ........... .. .. .. ...... .. .. .. .. .. .. .. .. .. .. ........... .. .. .. ...... .. .. .. .. ........... .. .......... 26- Grand Rive r Estimation/ Estimates of Returns ........ .. .. .. .. .. .. .. .. .. .. .......... .. ........... .. .. ........ .. .. .. .. ........ .. .. ........... .. .. .. .. ........ .. .26 Conservation Requirements . .. .. ........... .. .. .. ...... .. .. .. .. .... .. .. .. .. ....................... .. .. .. .. .. .. .. .. .. .. ........... .. .. .. .. .. .. .. .. .. .27 Escapement/Juveniles .. .. .. .. .. .. .. ....................... .. .. .. .. .. .. .. .. .. .. .......... .. ........... .. .. .. ...... .. .. .. .. ........... .. .... ...... .. .. .. .27 Forecast . .. .. ............. .. ........ .. .. .. .. .. .. .. .. .. .. ........ ... .. .. .. .. .. .. .. .. .. .. .... .. .. .. .. ...... .. .. .. ........... .. .. .. .. ...... ................. .. .. .. 28 Ecological Considerations ....... ............ .. .. .. .. .. .. .. .. .. .. ........... ............ .. .. .. .. .. .. .. .. .. .. ....................... .. .. .. .. ........... .. .. .. .28 In-river/ Marine . .. .. .. ....................... .. .. .. .. .. .. .. .. .. .. ............ ........... .. .. .. ...... .. .. .. .. .... .. .. .. .. ........... .. .. .. .. .. .. .. .. .. .. ...... 28 Management Considerations .. .. .. .. .. .. .. .. ........... .. .. .. .. .... .. .. .. .. .. .... .. .. .. ............... ........ .. .. .. .. .. .. .. .. .. .. ........... .. .. .. .. ...... 29 Acknowledgements ........... .. .. ........ .. .. .. .. .. .. .. .. .. .. ........... .. .......... .. .. .. .. .. .. .. .. .. .. ............ ........... .. .. .. .. .. .. .. .. .. .. ....... .. ....30 - Literature Cited . .. .. .. .. .. .. .. .. .. ........... ............ .. .. .. .. .. .. .. .. .. .. .......... .. .. ........ .. .. .. .. .. .. .. ... .. ........... .. .......... .. .. .. .. ......... .... 30 Peer Review/ Outside Consultations ... .. .. .. ........... .. .. .. .. .... .. .. .. .. .... .. .. .. .. ........... .. .......... .. .. .. .. ............... .... ........... ..32 Tables/ Figures . .... .. .. .. ........... .. .......... .. .. .. .. .. .. .. .. .. .. ........... ............ .. .. .. .. .... .. .. .. .. .. .. .. .. .. .. ........... .. .. .. .. ........... .. .. .. .. .35 3 ABSTRACT Assessments of the stock status of Atlantic salmon were conducted on the Margaree, Middle, Baddeck, North, Sydney and Grand rivers of SFAs 18 and 19, Cape Breton Island . These rivers account for >90% of the total recreational fishing effo rt exerted on the Island's 33 rivers fished for salmon in 1995 . Returning salmon were either counted at fishways or estimated by mark-and-recapture techniques . Estimated returns of 2,365 large and 737 small salmon to the Margaree, 268 large and 120 small salmon to the No rth and 19 large and 262 small to Grand River Falls contribute d attainment of 192, 169 and 120% of respective conservation requirements . Returns of 328 large and 51 small fish to the Middle River, 265 large and 96 small fish to Baddeck River and 104 large and 18 small salmon to the Sydney River contributed to the attainment of 67, 68 and 61 % of their respective conservation requirements. Evidence of lateness of salmon returning to some rivers raise d uncertainty about completeness of estimates to the Middle, Baddeck and perhaps, North rivers. Prognoses
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