Fishes in the CLLMM and foodweb
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1 Mulloway Stock Assessment Report 2013/14 SUMMARY PRESENTATION Fishes in the CLLMM and foodweb A/Prof Qifeng Ye, SARDI Aquatic Sciences Chris Bice, Luciana Bucater, Jason Earl, Greg Ferguson, George Giatas, Scotte Wedderburn and Brenton Zampatti
2 Fishes in the CLLMM Congolli Mulloway Black bream Bony herring Lamprey Sandy sprat Yarra pygmy perch Greenback flounder Murray hardyhead Yelloweye mullet Smallmouthed hardyhead Southern pygmy perch Murray cod Golden perch Tamar River goby
3 Fish functional groups Freshwater Marine Estuarine Diadromous Adapted from Whitfield 1999
4 Terminal lakes and dynamic estuarine lagoonal system River flow Lake water levels Connectivity Salinity Productivity
5 Fish monitoring and studies Funded by the MDBA TLM Program & Murray Futures CLLMM Program Lower Lakes Small-bodied fish monitoring (e.g. Bice et al. 2013; Wedderburn et al. 2014a); Investigating the large-bodied fish assemblage fisheries data (Ferguson and Ye 2016); Murray Estuary & Coorong Fish intervention and condition monitoring research and fisheries data (e.g. Ye et al. 2015a, b) Fish movement and recruitment focusing on diadromous species (e.g. Bice and Zampatti 2015); Conceptual foodweb models focusing on fishes (Giatas and Ye 2016).
6 Annual barrage flow Flood/flow / / / / / / / / / / / / / /15 Flow (GL.year -1 ) Drought 0 Flow effects on fish and foodweb?
7 Highlights for the Coorong
8 Australian salmon (drought) Marine stragglers Toad fish King george whiting Kelpfish Australian herring Australian anchovy
9 Distribution Recruitment/Abundance E NL Abundance (fish.hour -1 ) Discharge (GL.month -1 ) / / / / / / / /14 0 SL Drought Period Data: Bice & Zampatti
10 (flow) Freshwater Diadromous Estuarine Congolli Lagoon goby Australian smelt Bony herring Marine estuarine opportunist Mulloway Sandy sprat Pouched lamprey
11 Distribution Recruitment/Abundance E NL Abundance (fish.hour -1 ) Discharge (GL.month -1 ) / / / / / / / /14 0 SL (flow) Data: Bice & Zampatti
12 LMS SOM Mulloway production Coorong estuary Research sampling (multi-panel gill nets)
13 Coorong foodweb model Giatas and Ye Low flow ( ) 3 2 High flow ( ) ME NL SL ME NL SL pelagic production benthic production
14 Foodweb structure (high vs low flows) Pelagic component of the foodweb dominates in ME and NL during high flows. High flow Low flow Benthic component dominates during low flows, particularly in NL and SL. Decreased foodweb complexity in NL and SL during low flows. pelagic production benthic production Quantitative data from Coorong Outside literature or observations
15 Key Messages Diverse fish assemblages in the CLLMM Flow key driver: lake levels, estuarine salinity, productivity & connectivity Freshwater flows Promote diversity, abundance, recruitment and distribution of estuarine-dependent fish species Enhance foodweb function and resilience High variability of estuarine system Long-term data needed to support management and policy decisions Consider antecedent conditions and population dynamics
16 Acknowledgements - SARDI staff David Short, Neil Wellman, Juan Livore, David Fleer, Hanru Wang, Arron Strawbridge, Craig Noell and many... - 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).
17 Condition Monitoring of Threatened Fish Populations in Lake Alexandrina and Lake Albert Scotte Wedderburn Thomas Barnes
18 Native fishes of the lakes Larger fishes Golden perch (callop) Black bream Bony bream Congolli Small-bodied fishes Murray hardyhead Southern pygmy perch Yarra pygmy perch Unspecked hardyhead Australian smelt Murray rainbowfish Southern purple-spotted gudgeon Carp gudgeon Flathead gudgeon Dwarf flathead gudgeon Common galaxias Smallmouth hardyhead Lagoon Goby Tamar River goby Western blue-spot goby Sandy sprat The University of Adelaide 2
19 Lake water level recession The University of Adelaide 3
20 Proportion of total catch Fish assemblages: March % 90% 80% 70% 60% 50% 40% 30% 20% 10% Alien Diadromous Estuarine Threatened species Freshwater common 0% The University of Adelaide 4
21 Pygmy perches Extirpated in wild but captive population maintained Small home range Well-vegetated habitat Distributed EMLR & L. Alexandrina Southern pygmy perch Endangered in SA Distribution in the MDB restricted to Lake Alexandrina Genetically distinct population Yarra pygmy perch Vulnerable EPBC Act 1999 Critically Endangered in SA The University of Adelaide 5
22 Murray hardyhead Maintained in drought refugia and captive breeding Annual life cycle Distributed from Kerang in Victoria to Lakes Lakes population is genetically distinct Endangered EPBC Act 1999 The University of Adelaide 6
23 Mean number of fish per site Southern pygmy perch Year The University of Adelaide 7
24 Southern pygmy perch Pre The University of Adelaide 8
25 Mean number of fish per site Yarra pygmy perch Year The University of Adelaide 9
26 Yarra pygmy perch Pre-2005 The University of Adelaide 10
27 Mean number of fish per site Murray hardyhead Year The University of Adelaide 11
28 Murray hardyhead Pre The University of Adelaide 12
29 Population recovery River flows (volume, timing, duration) Water levels in obligate habitats Salinity, aquatic plants, alien species Zooplankton life cycle (e.g. Rotifera) Alien fishes Eastern gambusia Redfin perch Photo: Russ Shiel Photo: Luke Pearce The University of Adelaide 13
30 Management of threatened fish populations Ongoing monitoring MDBA s The Living Murray Acknowledge loss of Yarra pygmy perch? (more reintroductions) Investigate factors influencing recovery (water levels, alien fishes) Drought preparedness Drought refugia crucial (prevent extirpation, seeding for recovery, avoid captivity) The University of Adelaide 14
31 Acknowledgements This project was funded by The Living Murray initiative of the Murray Darling Basin Authority, through the Condition Monitoring program. The project has been managed by the Department of Environment, Water and Natural Resources, through the Lower Lakes, Coorong and Murray Mouth Icon Site staff Adrienne Rumbelow, Kirsty Wedge and Rebecca Turner. Thank you to Thomas Barnes and Colin Bailey for help with field work and reporting. We acknowledge the people of the Ngarrindjeri Nation as the traditional custodians of the land on which this study was undertaken. Thanks to Owen Love, Tom Trevorrow, Cyril Trevorrow, Russell Rigney, Tim Hartman, Jeremy Rigney, Anthony Long, Joseph Smith, Joe Trevorrow, Chris Kropinyeri, Anthony Camilleri, Conway Johnson and Yanima Hartman from the Ngarrindjeri Regional Authority for their valued field assistance. Thank you to the landholders who allowed access to sites, including Colin and Sally Grundy (Mundoo Island), Phil and Yvonne Giles (Nindethana), Lesley and Mick Fischer (Campbell House), Nigel Treloar (Belcanoe), Kevin and Benita Wells (Shadows Lagoon), Ack and Jenny Vercoe (Dog Lake), Chris and Beth Cowan (Poltalloch), Amanda Burger (Boggy Creek), Jamie Withers (Nalpa Station) and Terry McAnaney (Boggy Lake). The University of Adelaide 15
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