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Lyle, JM, Bell, JD, Chuwen, BM, Barrett, N, Tracey, SR & Buxton, C Assessing the impacts of gillnetting in Tasmania: Implications for by-catch and biodiversity Jeremy M. Lyle, Justin D. Bell, Ben M. Chuwen, Neville Barrett, Sean R. Tracey, Colin D. Buxton August 2014 FRDC Project No 2010/016 FRDC 2010/016 - Impacts of gillnetting © 2014 Fisheries Research and Development Corporation. All rights reserved. ISBN 978-1-86295-758-9 Assessing the impacts of gillnetting in Tasmania: implications for by-catch and biodiversity 2010/016 June 2014 Ownership of Intellectual property rights Unless otherwise noted, copyright (and any other intellectual property rights, if any) in this publication is owned by the Fisheries Research and Development Corporation and the Institute for Marine and Antarctic Studies, University of Tasmania. This publication (and any information sourced from it) should be attributed to ‘Lyle, J.M., Bell, J.D., Chuwen, B.M, Barrett, N., Tracey, S.R., and Buxton, C.D., Institute for Marine and Antarctic Studies, University of Tasmania, 2014, Assessing the impacts of gillnetting in Tasmania: implications for by-catch and biodiversity, Hobart, August, CC BY 3.0’. Creative Commons licence All material in this publication is licensed under a Creative Commons Attribution 3.0 Australia Licence, save for content supplied by third parties, logos and the Commonwealth Coat of Arms. Creative Commons Attribution 3.0 Australia Licence is a standard form licence agreement that allows you to copy, distribute, transmit and adapt this publication provided you attribute the work. A summary of the licence terms is available from creativecommons.org/licenses/by/3.0/au/deed.en. The full licence terms are available from creativecommons.org/licenses/by/3.0/au/legalcode. Inquiries regarding the licence and any use of this document should be sent to: [email protected]. Disclaimer The authors do not warrant that the information in this document 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 document or for any consequences arising from its use or any reliance placed upon it. The information, opinions and advice containe d in this document may not relate, or be relevant, to a readers particular circumstances. Opinions expressed by the authors are the individual opinions expressed by those persons and are not necessarily those of the publisher, research provider or the FRDC. The Fisheries Research and Development Corporation plans, invests in and manages fisheries research and development throughout Australia. It is a statutory authority within the portfolio of the federal Minister for Agriculture, Fisheries and Forestry, jointly funded by the Australian Government and the fishing industry. Researcher Contact Details FRDC Contact Details Name: Jeremy Lyle Address: 25 Geils Court Address: Nubeena Crescent Deakin ACT 2600 Taroona TAS Phone: 02 6285 0400 Phone: +61 3 62 277 255 Fax: 02 6285 0499 Fax: +61 3 62 278 035 Email: [email protected] Email: [email protected] Web: www.frdc.com.au In submitting this report, the researcher has agreed to FRDC publishing this material in its edited form. FRDC 2010/016 - Impacts of gillnetting Contents List of tables ............................................................................ iv List of Figures ........................................................................ vii Acknowledgments .................................................................. ix Abbreviations ........................................................................... x Executive Summary ................................................................ xi Introduction .............................................................................. 1 Tasmanian gillnet fisheries ............................................................................................................... 1 Management of gillnet fishing in Tasmania ...................................................................................... 1 By-catch ............................................................................................................................................ 3 Post release survival .......................................................................................................................... 3 Need .................................................................................................................................................. 4 Objectives ................................................................................. 5 Methodology ............................................................................. 6 Overview ........................................................................................................................................... 6 Research fishing ................................................................................................................................ 6 Commercial catch sampling .............................................................................................................. 7 Effects of gillnet soak time on capture condition .............................................................................. 8 Effects of fish size on how fish are meshed ...................................................................................... 9 Post release survival of gillnet caught fish ........................................................................................ 9 Physiological effects of gillnet capture ........................................................................................... 10 Spatial and temporal variation in the abundance and diversity of fish communities ...................... 11 Threatened, endangered and protected species analysis ................................................................. 12 Recreational fisher survey ............................................................................................................... 13 Ecological risk assessment .............................................................................................................. 13 Results .................................................................................... 16 Tasmanian gillnet fisheries ............................................................................................................. 16 Condition and survival of gillnet caught fish .................................................................................. 27 Estimating post release survival using mark-recapture techniques ................................................. 40 Physiological effects of gillnet capture ........................................................................................... 43 Interactions with threatened, endangered and protected species and habitat .................................. 47 Variation in the abundance and diversity of fish communities with links to gillnetting ................. 52 Motivations, behaviour and attitudes of recreational gillnet fishers ............................................... 68 Ecological risk assessment .............................................................................................................. 81 Discussion ............................................................................ 102 Catch and by-catch in Tasmanian gillnet fisheries ........................................................................ 102 Condition and survival of gillnet caught fish ................................................................................ 104 Estimating post release survival using mark-recapture techniques ............................................... 108 Page ii FRDC 2010/016 - Impacts of gillnetting Physiological effects of gillnet capture .......................................................................................... 109 Interactions with threatened, endangered and protected species ................................................... 111 Interactions with habitat ................................................................................................................. 114 Variation in the abundance and diversity of fish communities with links to gillnetting ............... 114 Motivations, behaviour and attitudes of recreational gillnet fishers .............................................. 117 Ecological risk assessment ............................................................................................................. 119 Conclusion ........................................................................... 122 Implications .......................................................................... 125 Recommendations ............................................................... 127 Further development ...................................................................................................................... 129 Extension and Adoption ..................................................... 129 Project coverage ............................................................................................................................. 131 Appendix 1: Staff list ........................................................... 132 Appendix 2: Intellectual Property ....................................... 132 Appendix 3: Data summaries and additional statistical analyses ................................................................................ 133 Appendix 4: References ...................................................... 164 Page iii FRDC 2010/016
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