Mulloway Stock Assessment Report 2013/14 SUMMARY PRESENTATION Fish assemblages in the Coorong A/Prof Qifeng Ye, SARDI Aquatic Sciences Luciana Bucater, David Short and Neil Wellman Chris Bice, Brenton Zampatti and Jason Earl
Coorong Sandy sprat fishes Black bream Smallmouthed hardyhead Congolli Greenback flounder Lamprey Yelloweye mullet Mulloway
Fishes and Estuaries Diadromous Estuarine Marine Freshwater Adapted from Whitfield 1999
Dynamic estuarine – lagoonal system • Flow • Connectivity Salinity Productivity
Annual barrage flow Flood/flow Drought
2007 – 2010 Toad fish Australian salmon (drought) ‘Marine stragglers’ King george whiting Kelpfish Australian herring Australian anchovy
Distribution Recruitment/Abundance 2500 16.0 14.0 12.0 10.0 8.0 2000 6.0 E Abundance (fish.hour -1 ) Discharge (GL.month -1 ) 4.0 2.0 1.0 1500 0.8 1000 0.6 0.4 500 NL 0.2 0.0 0 2006/07 2007/08 2008/09 2009/10 2010/11 2011/12 2012/13 2013/14 SL Drought Period Data: Bice & Zampatti
2010 – 2013 (flow) ‘Estuarine’ ‘Freshwater’ ‘Diadromous’ Congolli Lagoon goby Australian smelt ‘Marine migrant’ Mulloway Bony herring Sandy sprat Pouched lamprey
Distribution Recruitment/Abundance 2500 16.0 14.0 12.0 10.0 8.0 2000 E 6.0 Abundance (fish.hour -1 ) Discharge (GL.month -1 ) 4.0 2.0 1.0 1500 0.8 1000 0.6 0.4 500 NL 0.2 0.0 0 2006/07 2007/08 2008/09 2009/10 2010/11 2011/12 2012/13 2013/14 SL 2010 – 2013 (flow) Data: Bice & Zampatti
Mulloway production – Coorong estuary Research sampling ( multi-panel gill nets ) LMS SOM
Summary • Dynamic fish assemblages in the Coorong – Flow, salinity and connectivity key drivers • Freshwater inflows promote diversity, abundance, recruitment and distribution in estuarine-dependent fish • High variability of estuarine system – long-term data needed to support management and policy decisions
Acknowledgements - This project was funded by the DEWNR and is part of the SA Government’s Murray Futures program, funded in turn by the Australian Government’s Water for the Future initiative, and is supported by the MDBA Living Murray program. - Baseline work was funded by the FRDC, CSIRO WfHC Flagship and MDBA through SAMDB NRMB. - DEWNR staff Paul McEvoy, Adrienne Rumbelow, Rebecca Quin, Adam Watt, Kirsty Wedge, Jason Higham, Ann-Marie Jolley and Liz Barnett for support and project management. - Lakes and Coorong fishers for sample supply. - Ngarrindjeri Regional Authority (NRA) to provide field assistance (funded by the MDBA via IPP). - SARDI staff Jason Earl, Juan Livore, David Fleer, Greg Ferguson, Hanru Wang, Arron Strawbridge, Craig Noell and George Giatas.
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