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Monitoring Salt Wedge Dynamics, Food Availability and Black Bream (Acanthopagrus Butcheri) Recruitment in the Coorong During 2018-19

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Monitoring Salt Wedge Dynamics, Food Availability and Black Bream (Acanthopagrus Butcheri) Recruitment in the Coorong During 2018-19 Monitoring salt wedge dynamics, food availability and black bream (Acanthopagrus butcheri) recruitment in the Coorong during 2018-19 Qifeng Ye, Luciana Bucater, Deborah Furst, Zygmunt Lorenz, George Giatas and David Short SARDI Publication No. F2018/000425-2 SARDI Research Report Series No. 1045 SARDI Aquatics Sciences PO Box 120 Henley Beach SA 5022 December 2019 Ye, Q. et al. (2019) Salt wedge dynamics, food availability and black bream recruitment 2018-19 Monitoring salt wedge dynamics, food availability and black bream (Acanthopagrus butcheri) recruitment in the Coorong during 2018-19 Qifeng Ye, Luciana Bucater, Deborah Furst, Zygmunt Lorenz, George Giatas and David Short SARDI Publication No. F2018/000425-2 SARDI Research Report Series No. 1045 December 2019 II Ye, Q. et al. (2019) Salt wedge dynamics, food availability and black bream recruitment 2018-19 This publication may be cited as: Ye, Q., Bucater, L., Furst, D., Lorenz, Z., and Giatas, G. and Short, D. (2019). Monitoring salt wedge dynamics, food availability and black bream (Acanthopagrus butcheri) recruitment in the Coorong during 2018-19. South Australian Research and Development Institute (Aquatic Sciences), Adelaide. SARDI Publication No. F2018/000425-2. SARDI Research Report Series No. 1045. 48pp. South Australian Research and Development Institute SARDI Aquatic Sciences 2 Hamra Avenue West Beach SA 5024 Telephone: (08) 8207 5400 Facsimile: (08) 8207 5415 www.pir.sa.gov.au/research Cover photos: Anthony Moore (CEWO) DISCLAIMER The contents of this publication do not purport to represent the position of the Commonwealth of Australia or the MDBA in any way and, as appropriate, are presented for the purpose of informing and stimulating discussion for improved management of the Basin's natural resources. To the extent permitted by law, the copyright holders (including its employees and consultants) exclude all liability to any person for any consequences, including but not limited to all losses, damages, costs, expenses and any other compensation, arising directly or indirectly from using this report (in part or in whole) and any information or material contained in it. 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, the Commonwealth, the MDBA and DEW 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, the Commonwealth, the MDBA and DEW 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. © 2019 SARDI DEW MDBA and CEWO 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. With the exception of the Commonwealth Coat of Arms, the Murray-Darling Basin Authority, SARDI and DEW logos and photographs, all material presented in this document is provided under a Creative Commons Attribution 4.0 Australia licence (https://creativecommons.org/licences/by/4.0/). For the avoidance of any doubt, this licence only applies to the material set out in this document. The details of the licence are available on the Creative Commons website (accessible using the links provided) as is the full legal code for the CC BY 4.0 AU licence ((https://creativecommons.org/licences/by/4.0/legalcode ). SARDI Publication No. F2018/000425-2 SARDI Research Report Series No. 1045 Author(s): Qifeng Ye, Luciana Bucater, Deborah Furst, Zygmunt Lorenz, George Giatas and David Short Reviewer(s): Jason Earl (SARDI), Anthony Moore (CEWO), Lucy Carlile (CEWO), Adrienne Rumbelow (DEW) Approved by: A/Prof Xiaoxu Li Science Leader – Aquaculture Signed: Date: 23 December 2019 Distribution: DEW, MDBA, CEWO, SAASC Library, University of Adelaide Library, Parliamentary Library, State Library and National Library Circulation: Public Domain III Ye, Q. et al. (2019) Salt wedge dynamics, food availability and black bream recruitment 2018-19 TABLE OF CONTENTS TABLE OF CONTENTS ......................................................................................................... IV LIST OF FIGURES ................................................................................................................. V LIST OF TABLES .................................................................................................................. VII ACKNOWLEDGEMENTS .................................................................................................... VIII EXECUTIVE SUMMARY .........................................................................................................1 1. INTRODUCTION ..............................................................................................................3 1.1. Background ...............................................................................................................3 1.2. Need .......................................................................................................................... 5 1.3. Objectives ..................................................................................................................6 2. METHODS ........................................................................................................................ 7 2.1. Salt wedge monitoring ...............................................................................................7 2.2. Zooplankton assessment ...........................................................................................8 2.3. Sampling YOY black bream ......................................................................................9 2.4. Data analysis ...........................................................................................................11 3. RESULTS ....................................................................................................................... 12 3.1. Barrage releases and environmental water use ......................................................12 3.2. Characterising salt wedge conditions ......................................................................14 3.3. Linking flow discharge with suitable larval habitat area ...........................................19 3.4. Assessing larval fish food resources .......................................................................21 3.5. Black bream recruitment ..........................................................................................25 4. DISCUSSION .................................................................................................................29 5. CONCLUSION AND MANAGEMENT IMPLICATIONS .................................................. 35 REFERENCES ...................................................................................................................... 37 APPENDIX ............................................................................................................................. 41 IV Ye, Q. et al. (2019) Salt wedge dynamics, food availability and black bream recruitment 2018-19 LIST OF FIGURES Figure 1-1. Map of the Coorong presenting Murray Estuary, North and South lagoons. ........ 5 Figure 2-1. Map of the Coorong presenting sites for salinity, water temperature and dissolved oxygen profiling along the Goolwa, Tauwitcherie and Coorong transects. Sites marked with a star represent where zooplankton sampling occurred. ..................................... 7 Figure 2-2. Map of the Coorong presenting sampling sites (solid black circles) for YOY black bream using fyke nets and a small seine net. Dashed line indication boundary between Murray Estuary and North Lagoon. ........................................................................... 10 Figure 3-1. Total annual flow discharge to the Coorong (GL.year-1). Discharge from 2003-04 to 2012-13 were modelled data (Data source: MDBA) and from 2013-14 to 2018-19 were calculated dashboard data (Data source: DEW). ............................................. 12 Figure 3-2. Daily flow discharge by individual barrages (ML.day-1) for 2018-19. a) Goolwa barrage, b) Mundoo barrage, c) Boundary Creek barrage, d) Ewe Island barrage, e) Tauwitcherie barrage and f) Combined discharge (five barrages). Blue bars are the timing of field trips. Data source: DEW. .................................................................... 13 Figure 3-3. The longitudinal and depth profile of salinities measured at multiple sites with ~1 km interval along the Goolwa (G1−G8), Tauwitcherie
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