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Monitoring of Native Fish Communities in the Broken Creek and Broken River

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Monitoring of Native Fish Communities in the Broken Creek and Broken River Monitoring of Native Fish Communities in the Broken Creek and Broken River 2008 Arthur Rylah Institute for Environmental Research Arthur Rylah Institute for Environmental Research Monitoring of Native Fish Communities in the Broken Creek and Broken River Justin O’Connor and Frank Amtstaetter Arthur Rylah Institute for Environmental Research 123 Brown Street, Heidelberg, Victoria 3084 July 2008 Arthur Rylah Institute for Environmental Research Department of Sustainability and Environment Heidelberg, Victoria Report produced by: Arthur Rylah Institute for Environmental Research Department of Sustainability and Environment PO Box 137 Heidelberg, Victoria 3084 Phone (03) 9450 8600 Website: www.dse.vic.gov.au/ari © State of Victoria, Department of Sustainability and Environment 2008 This publication is copyright. Apart from fair dealing for the purposes of private study, research, criticism or review as permitted under the Copyright Act 1968 , no part may be reproduced, copied, transmitted in any form or by any means (electronic, mechanical or graphic) without the prior written permission of the State of Victoria, Department of Sustainability and Environment. All requests and enquires should be directed to the Customer Service Centre, 136 186 or email [email protected] Citation: O’Connor, J. and Amtstaetter, F. (2008) Monitoring Native Fish Communities in the Broken Creek and Broken River. Client Report fot the Goulburn Broken CMA. Arthur Rylah Institute for Environmental Research. Department of Sustainability and Environment, Heidelberg, Victoria ISBN ISBN 978-1-74208-703-0 (print) Disclaimer: This publication may be of assistance to you but the State of Victoria and its employees do not guarantee that the publication is without flaw of any kind or is wholly appropriate for your particular purposes and therefore disclaims all liability for any error, loss or other consequence which may arise from you relying on any information in this publication. Front cover photo: (clockwise from top left), Numurkah Weirpool, Broken River upstream of Gowangardie Weir, Broken River Murray cod sampled from upstream of Caseys Weir, Broken Creek upstream of Nathalia Town Weir. Photos: Justin O’Connor. Authorised by: Victorian Government, Melbourne ii Contents List of tables and figures................................................................................................................. iv Summary............................................................................................................................................1 1 Introduction.............................................................................................................................4 2 Methods....................................................................................................................................5 2.1 Study site...................................................................................................................................5 2.1.1 Broken Creek.............................................................................................................6 2.1.2 Broken River .............................................................................................................7 2.2 Water Quality............................................................................................................................8 2.3 Electrofishing............................................................................................................................8 2.3.1 Broken Creek.............................................................................................................9 2.3.2 Broken River .............................................................................................................9 2.4 Data analysis...........................................................................................................................10 2.4.1 Broken Creek...........................................................................................................10 2.4.2 Broken River ...........................................................................................................10 3 Results....................................................................................................................................10 3.1 Broken Creek ..........................................................................................................................10 3.1.1 Water Quality ..........................................................................................................10 3.1.2 Habitat .....................................................................................................................10 3.1.3 Electrofishing surveys .............................................................................................11 3.2 Broken River...........................................................................................................................13 3.2.1 Water Quality ..........................................................................................................13 3.2.2 Electrofishing surveys .............................................................................................13 3.2.3 Catch Per Unit Effort...............................................................................................14 4 Discussion ..............................................................................................................................18 4.1 Broken Creek ..........................................................................................................................18 4.2 Broken River...........................................................................................................................19 5 Recommendations.................................................................................................................21 References........................................................................................................................................22 Appendix 1 .......................................................................................................................................24 Water quality from Broken Creek and Broken River .............................................................24 iii List of tables and figures List of tables Table 1: Site locations on the Broken Creek...................................................................................... 7 Table 2: Site locations on the Broken River....................................................................................... 8 Table 3: Number of native and introduced fish sampled, by species and site, from the Broken Creek in May 2008 using boat and backpack mounted electrofishing units.......................... 11 Table 4: Total abundance of species collected by bank mounted (BM EF) and boat mounted electrofishing (BOAT EF) at survey sites on the Broken River. Abundances include counts of species observed but not collected..................................................................................... 14 List of figures Figure 1. Map of the Broken River system in north-eastern Victoria indicating study sites on the Broken Creek (BC) and Broken River (BR). ........................................................................... 6 Figure 4: Comparison of percent native and percent native biomass in the Broken Creek between Nathalia and Numurkah in 2008 and a previous study conducted in the Broken Creek (O’Connor 2006). Error bars indicate ±1 SE. ....................................................................... 12 Figure 5: Number of large native fish (Murray cod and golden perch > 200 mm) observed in the Broken Creek between Nathalia and Numurkah in 2008 for three habitat classifications..... 13 Figure 6: Percentage species composition of CPUE of fish sampled using boat electrofishing in the Broken River fish survey ....................................................................................................... 15 Figure 7: Percentage species composition of CPUE of fish sampled using bank mounted electrofishing in the Broken River fish survey....................................................................... 17 iv Acknowledgements Wayne Tennant from the Goulburn Broken CMA reviewed the project plan and report. John Mahoney (ARI) assisted in field work. Wayne Tennant and Mark Turner (GB CMA) and Wayne Koster and Tim O’Brien (ARI) provided helpful comments on the final manuscript. This study was conducted under the following permits: • DSE Animal Care and Ethics approval permit No. AEC 07/09 • Vic DSE Flora and Fauna Guarantee Act Permit No. 10003509 • Victorian Fisheries Permit Number RP 827 v vi Summary Connectivity of river habitats, which is recognised as important for maintaining and restoring native fish populations, is compromised by river regulation. The Murray Darling Basin is the most regulated river system in Australia and the Broken River system, in north eastern Victoria, is among the most regulated systems within the Murray Darling Basin. Some of the greatest threats to native fish populations in the Broken River system result from the presence of weirs which act as barriers to fish movement. Knowledge of the status of native and introduced fish communities is important in managing natural resources. Our understanding of the fish community in the Broken Creek below the township of Nathalia is continuing to improve, however, a recent study indicated
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