Fishery Stock Assessment 2018/19
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Linnane, A. et al. (2020) Southern Zone Rock Lobster Fishery Southern Zone Rock Lobster (Jasus edwardsii) Fishery Stock Assessment 2018/19 A. Linnane, R. McGarvey, J. Feenstra and P. Hawthorne SARDI Publication No. F2007/000276-14 SARDI Research Report Series No. 1063 SARDI Aquatic Sciences PO Box 120 Henley Beach SA 5022 July 2020 Fishery Assessment Report to PIRSA Fisheries and Aquaculture i Linnane, A. et al. (2020) Southern Zone Rock Lobster Fishery Southern Zone Rock Lobster (Jasus edwardsii) Fishery Stock Assessment 2018/19 Fishery Assessment Report to PIRSA Fisheries and Aquaculture A. Linnane, R. McGarvey, J. Feenstra and P. Hawthorne SARDI Publication No. F2007/000276-14 SARDI Research Report Series No. 1063 July 2020 ii Linnane, A. et al. (2020) Southern Zone Rock Lobster Fishery This report may be cited as: Linnane, A., McGarvey, R., Feenstra, J. and Hawthorne, P. (2020). Southern Zone Rock Lobster (Jasus edwardsii) Fishery 2018/19. Fishery Assessment Report to PIRSA Fisheries and Aquaculture. South Australian Research and Development Institute (Aquatic Sciences), Adelaide. SARDI Publication No. F2007/000276-14. SARDI Research Report Series No. 1063. 68pp. South Australian Research and Development Institute SARDI Aquatic Sciences 2 Hamra Avenue West Beach SA 5024 Telephone: (08) 8207 5400 Facsimile: (08) 8207 5415 http://www.pir.sa.gov.au/research DISCLAIMER The authors warrant that they have taken all reasonable care in producing this report. The report has been through the SARDI internal review process, and has been formally approved for release by the Research Director, Aquatic Sciences. Although all reasonable efforts have been made to ensure quality, SARDI does not warrant that the information in this report is free from errors or omissions. SARDI and its employees do not warrant or make any representation regarding the use, or results of the use, of the information contained herein as regards to its correctness, accuracy, reliability and currency or otherwise. SARDI and its employees expressly disclaim all liability or responsibility to any person using the information or advice. Use of the information and data contained in this report is at the user’s sole risk. If users rely on the information they are responsible for ensuring by independent verification its accuracy, currency or completeness. The SARDI Report Series is an Administrative Report Series which has not been reviewed outside the department and is not considered peer-reviewed literature. Material presented in these Administrative Reports may later be published in formal peer-reviewed scientific literature. © 2020 SARDI This work is copyright. Apart from any use as permitted under the Copyright Act 1968 (Cth), no part may be reproduced by any process, electronic or otherwise, without the specific written permission of the copyright owner. Neither may information be stored electronically in any form whatsoever without such permission. SARDI Publication No. F2007/000276-14 SARDI Research Report Series No. 1063 Author(s): A. Linnane, R. McGarvey, J. Feenstra and P. Hawthorne Reviewer(s): B. Stobart and J. Earl (SARDI) and A. Jones (PIRSA) Approved by: Dr S. Mayfield Science Leader – Fisheries Signed: Date: 1 July 2020 Distribution: PIRSA Fisheries and Aquaculture, Southern Zone Rock Lobster licence holders, SAASC Library, Parliamentary Library, State Library and National Library Circulation: Public Domain iii Linnane, A. et al. (2020) Southern Zone Rock Lobster Fishery TABLE OF CONTENTS TABLE OF CONTENTS ...................................................................................................................... iv LIST OF TABLES ................................................................................................................................ vi LIST OF FIGURES ............................................................................................................................. vii ACKNOWLEDGEMENTS .................................................................................................................. viii EXECUTIVE SUMMARY ...................................................................................................................... 1 1 INTRODUCTION .......................................................................................................................... 3 1.1 Overview ................................................................................................................................ 3 1.2 Description of the fishery .................................................................................................... 3 1.2.1 Access ................................................................................................................................ 3 1.2.2 Management arrangements ............................................................................................... 3 1.2.3 Recreational fishery ............................................................................................................ 4 1.3 Biology of Southern Rock Lobster ..................................................................................... 6 1.4 Research program ................................................................................................................ 6 1.5 Information sources for assessment .................................................................................. 7 1.5.1 Commercial catch and effort data ...................................................................................... 7 1.5.2 Recreational catch and effort data ..................................................................................... 7 1.5.3 Voluntary catch sampling ................................................................................................... 7 1.5.4 Puerulus monitoring program ............................................................................................. 7 1.5.5 Fishery-Independent Monitoring Survey ............................................................................ 8 1.5.6 “qR” and “LenMod” stock assessment models ................................................................... 8 1.6 Harvest strategy .................................................................................................................... 9 1.6.1 Management plan ............................................................................................................... 9 1.6.2 Performance indicators ...................................................................................................... 9 1.7 Stock status classification................................................................................................. 10 2 METHODS .................................................................................................................................. 12 2.1 Commercial catch and effort statistics ............................................................................ 12 2.2 Recreational catch and effort data .................................................................................... 12 2.3 Voluntary catch sampling .................................................................................................. 12 2.4 Puerulus monitoring program ........................................................................................... 13 2.5 Fishery-Independent Monitoring Survey (FIMS).............................................................. 13 2.6 “qR” and “LenMod” stock assessment models .............................................................. 14 2.6.1 qR model .......................................................................................................................... 15 2.6.2 LenMod ............................................................................................................................. 15 2.7 Quality assurance of data .................................................................................................. 16 3 RESULTS ................................................................................................................................... 17 3.1 Commercial catch and effort statistics ............................................................................ 17 3.1.1 Zone ................................................................................................................................. 17 3.1.2 Within-season trends ........................................................................................................ 19 3.1.3 Spatial trends.................................................................................................................... 22 3.1.4 Additional indices ............................................................................................................. 27 3.2 Recreational catch and effort ............................................................................................ 30 3.3 Voluntary catch sampling .................................................................................................. 30 3.4 Puerulus monitoring program ........................................................................................... 33 3.5 Fishery-Independent Monitoring Survey (FIMS).............................................................. 35 iv Linnane, A. et al. (2020) Southern Zone Rock Lobster Fishery 3.6 “qR” and “LenMod” stock assessment models .............................................................. 37 3.6.1 Model fits .........................................................................................................................