^ DFO - LibraN I MPO w^^ itIIIII1llIIIllllllle IIIIIIIIIIIIIIIII ^^ ^ 12077841 Distribution and Life History Parameters of Elasmobranch Species in British Columbia Waters G .A. McFarlane, R.P. McPhie, and J.R. King Fisheries and Oceans Canada Science Branch, Pacific Region Pacific Biological Station Fisheries & Oceans Canada Ottawa Library Nanaimo, British Columbia V9T 6N7 JUL 2 n ?011 Pêches ct Océans Canada Ottawa bibljothéque yW,^ 2010 Canadian Technical Report of Fisheries and Aquatic Sciences 2908 Fisheries Pêches ^ 1 +1 and Oceans et Océans Canac^h. Canadian Technical Report of Fisheries and Aquatic Sciences Technical reports contain scientific and technical information that contributes to existirig knowledge but which is not normally appropriate for primary literature. Technical reports are directed primarily toward a worldwide audience and have an international distribution. 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Les rapports épuisés seront fournis contre rétribution par des agents commerciaux. Canadian Technical Report of Fisheries and Aquatic Sciences 2908 2010 1 DISTRIBUTION AND LIFE HISTORY PARAMETERS OF ELASMOBRANCH SPECIES IN BRITISH COLUMBIA WATERS by G.A. McFarlane, R.P. McPhie, and J.R. King Fisheries and Oceans Canada Science Branch, Pacific Region Pacific Biological Station Nanaiino, British Columbia V9T 6N7 IV ()Her Majesty the Queen in Right of Canada, 2010 Cat. No. Fs 97-6/2908E ISSN 0706-6457 Correct citation for this publication: McFarlane, G.A., McPhie, R.P., and King, J.R. 2010. Distribution and life history parameters of elasmobranch species in British Columbia waters. Can. Tech. Rep. Fish. Aquat. Sci. 2908: ix + 143 p. TABLE OF CONTENTS TABLE OF CONTENTS ................................................................................................... iii LIST OF TABLES ............................................................................................................. iv LIST OF FIGURES ........................................................................................................... vi ABSTRACT ....................................................................................................................... ix I INTRODUCTION .............................................................................................................. 1 METHODS ......................................................................................................................... 3 LIFE HISTORY PARAMETER TABLES .................................................................... 3 RECENT TAXONOMIC CHANGES AND COMMENTS ON DISTRIBUTION....... 4 DISTRIBUTION MAPS ................................................................................................. 5 CPUE MAPS .................................................................................................................. 6 RESULTS AND DISCUSSION ..................................................................... .................... 6 ACKNOWLEDGEMENTS .............................................................................................. 12 TABLES ........................................................................................................................... 19 FIGURES .......................................................................................................................... 89 APPENDIX 1: SHARK REFERENCES ........................................................................ 123 APPENDIX 2: SKATE REFERENCES ......................................................................... 137 APPENDIX 3: RAY REFERENCES ............................................................................. 141 iii LIST OF TABLES Table 1: Taxonomic classification (including common name), geographic distribution, depth range, and frequency of occurrence of sharks found in British Columbia waters. 19 Table 2: Age, growth and maturity characteristics of sharks found in British Columbia waters 24 Table 3: Ageing methodology, growth model(s) and growth parameters for sharks found in British Columbia waters. 32 Table 4: Reproductive characteristics of sharks found in British Columbia waters 39 Table 5: Demographic parameters of sharks found in British Columbia waters 44 Table 6: Mortality parameters and details of each associated study for sharks in British Columbia waters. 52 Table 7: Taxonomic classification (including common name), geographic distribution, depth range, and frequency of occurrence of skates found in British Columbia waters. 57 Table 8: Age, growth and maturity characteristics of skates found in British Columbia waters. 60 Table 9: Ageing methodology, growth model(s) and growth parameters for skates found in British Columbia waters. 64 Table 10: Reproductive characteristics of skates found in British Columbia waters. 70 Table 11: Demographic parameters of skates found in British Columbia waters 73 Table 12: Mortality parameters and details of each associated study for skates in British Columbia waters. 75 Table 13: Taxonomic classification (including common name), geographic distribution,, depth range, and frequency of occurrence of rays found in British Columbia waters.. 80 Table 14: Age, growth and maturity characteristics of rays found in British Columbia waters 81 Table 15: Ageing methodology, growth model(s) and growth parameters for rays found in British Columbia waters. 82 iv Table 16: Reproductive characteristics of rays found in British Columbia waters 83 Table 17: Demographic parameters of rays found in British Columbia waters 84 Table 18: Mortality parameters and details of each associated study for rays in British Columbia waters 86 Table 19: Species prioritized for study in BC waters based upon the criteria of: 1) amount of basic life history information available; 2) the frequency of occurrence in BC waters; 3) the current knowledge of the species' status based on the IUCN Red List (2010); and 4) the inherent vulnerability of the species based on the lowest estimated r-value from the literature, where r = intrinsic rate of population increase 88 LIST OF FIGURES Figure 1. Distribution of cow sharks (sixgill shark, Hexanchus griseus or sevengill shark, Notorynchus maculatus) not identified to species off the west coast of Canada from 1984 to 2007. 89 Figure 2. Distribution of sixgill shark (Hexanchus griseus) off the west coast of Canada from 1979 to 2007 during A) the summer (May to October) and B) the winter (November to April) 90 Figure 3. Distribution of sevengill shark (Notorynchus cepdianus) off the west coast of Canada from summer (June) 1991. There is no winter catch recorded for sevengill shark. 91 Figure 4. Historical distribution of great white shark (Carcharodon