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Rapid Assessment of Sustainability for Ecological Risk of Shark and Other Rapid assessment of sustainability for ecological risk of shark and other chondrichthyan bycatch species taken in the Southern and Eastern Scalefish and Shark Fishery Terence I. Walker, John D. Stevens, J. Matias Braccini, Ross K. Daley, Charlie Huveneers, Sarah B. Irvine, Justin D. Bell, Javier Tovar‐Ávila, Fabian I. Trinnie, David T. Phillips, Michelle A. Treloar, Cynthia A. Awruck, Anne S. Gason, John Salini, and William C. Hamlett Project No. 2002/033 Rapid assessment of sustainability for ecological risk of shark and other chondrichthyan bycatch species taken in the Southern and Eastern Scalefish and Shark Fishery Terence I. Walker, John D. Stevens, J. Matias Braccini, Ross K. Daley, Charlie Huveneers, Sarah B. Irvine, Justin D. Bell, Javier Tovar‐ Ávila, Fabian I. Trinnie, David T. Phillips, Michelle A. Treloar, Cynthia A. Awruck, Anne S. Gason, John Salini, and William C. Hamlett July 2008 Project Number 2002/033 Rapid assessment of sustainability for ecological risk of shark and other chondrichthyan bycatch species taken in the Southern and Eastern Scalefish and Shark Fishery FRDC Report 2002/033 Terence I. Walker, John D. Stevens, J. Matias Braccini, Ross J. Daley, Charlie Huveneers, Sarah B. Irvine, Justin D. Bell, Javier Tovar‐ Ávila, Fabian I. Trinnie, David T. Phillips, Michelle A. Treloar, Cynthia A. Awruck, Anne S. Gason, John Salini, and Hamlett, W. C. Published by Department of Primary Industries, Fisheries Research Brand, Queenscliff, Victoria, 3225. © Fisheries Research and Development Corporation, and Fisheries Victoria. 2008 This work is copyright. Except as permitted under the Copyright Act 1968 (Cth), no part of this publication may be reproduced by any process, electronic or otherwise, without the specific written permission of the copyright owners. Neither may information be stored electronically in any form whatsoever without such permission. DISCLAIMER The authors do not warrant that the information in this book is free from errors or omissions. The authors do not accept any form of liability, be it contractual, tortious or otherwise, for the contents of this book or for any consequences arising from its use or any reliance placed upon it. The information, opinions and advice contained in this book may not relate to, or be relevant to, a readerʹs particular circumstances. Opinions expressed by the authors are the individual opinions of those persons and are not necessarily those of the publisher or research provider. ISBN Preferred way to cite: Walker, T. I., Stevens, J. D., Braccini, J. M., Daley, R. J., Huveneers, C., Irvine, S. B., Bell, J. D., Tovar‐ Ávila, J., Trinnie, F. I., Phillips, D. T., Treloar, M. A., Awruck, C. A., Gason, A. S., Salini, J., and Hamlett, W. C. (2008). Rapid assessment of sustainability for ecological risk of shark and other chondrichthyan bycatch species taken in the Southern and Eastern Scalefish and Shark Fishery. Final report to Fisheries Research and Development Corporation Project No. 2002/033. (July 2008.) 354 + v pp. (Fisheries Research Brand: Queenscliff, Victoria, Australia). Formatted/designed by Marine and Freshwater Fisheries Research Institute, Queenscliff, Victoria, Australia. Printed by DPI Queenscliff, Victoria, Australia. Rapid assessment for ecological risk of chondrichthyan species in the SESSF ii FRDC Report 2002/033 Table of Contents NON‐TECHNICAL SUMMARY ................................................................................................................................. 1 OBJECTIVES:.................................................................................................................................................................... 1 NON TECHNICAL SUMMARY: ........................................................................................................................................ 1 OUTCOMES ACHIEVED ........................................................................................................................................... 3 ACKNOWLEDGMENTS .............................................................................................................................................. 4 BACKGROUND ............................................................................................................................................................. 5 ACRONYMS..................................................................................................................................................................... 5 STRUCTURE OF REPORT .................................................................................................................................................. 5 CONDUCT OF PRESENT PROJECT .................................................................................................................................... 6 PREVIOUS AND OTHER RESEARCH ................................................................................................................................. 7 NEED................................................................................................................................................................................. 7 OBJECTIVES ................................................................................................................................................................... 9 METHODS..................................................................................................................................................................... 10 DETERMINATION OF SPECIES LISTS .............................................................................................................................. 10 CATCH EVALUATION AND TREND ANALYSIS .............................................................................................................. 10 COLLECTION AND LABORATORY PREPARATION OF SPECIMENS ................................................................................. 10 BIOLOGICAL PRODUCTIVITY......................................................................................................................................... 11 Natural mortality ...................................................................................................................................................... 12 Age and growth......................................................................................................................................................... 12 Reproductive biology................................................................................................................................................ 13 CATCH SUSCEPTIBILITY ................................................................................................................................................ 15 TROPHIC POSITION ....................................................................................................................................................... 17 RESOLVING TAXONOMIC UNCERTAINTY ..................................................................................................................... 18 ECOLOGICAL RISK ASSESSMENT................................................................................................................................... 18 SUSTAINABILITY OF DOGFISH....................................................................................................................................... 18 RESULTS/DISCUSSION ............................................................................................................................................ 19 DETERMINATION OF SPECIES LISTS .............................................................................................................................. 19 CATCH EVALUATION AND TREND ANALYSIS .............................................................................................................. 19 BIOLOGICAL PRODUCTIVITY......................................................................................................................................... 20 CATCH SUSCEPTIBILITY ................................................................................................................................................ 20 TROPHIC POSITION ....................................................................................................................................................... 21 RESOLVING TAXONOMIC UNCERTAINTY ..................................................................................................................... 22 Genus Centrophorus................................................................................................................................................. 22 Genus Squalus .......................................................................................................................................................... 22 Genus Orectolobus ................................................................................................................................................... 22 Genus Mitsukurina.................................................................................................................................................... 22 ECOLOGICAL RISK ASSESSMENT................................................................................................................................... 23 SUSTAINABILITY OF DOGFISH......................................................................................................................................
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