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Distribution and Conservation Status of the Endangered Oxleyan Pygmy Perch Nannoperca Oxleyana Whitley in New South Wales

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Distribution and Conservation Status of the Endangered Oxleyan Pygmy Perch Nannoperca Oxleyana Whitley in New South Wales FISHERIES FINAL REPORT SERIES | NO. 153 Distribution and conservation status of the endangered Oxleyan pygmy perch Nannoperca oxleyana Whitley in New South Wales James T. Knight Published by the NSW Department of Primary Industries Distribution and conservation status of the endangered Oxleyan pygmy perch Nannoperca oxleyana Whitley in New South Wales NSW DPI – Fisheries Final Report Series No. 153 First published August 2016 ISSN 2204-8669* More information Author: James T. Knight Port Stephens Fisheries Institute, Locked Bag 1, Nelson Bay, NSW 2315, Australia www.dpi.nsw.gov.au Acknowledgments © State of New South Wales through the Department of Industry, Skills and Regional Development, 2016. You may copy, distribute and otherwise freely deal with this publication for any purpose, provided that you attribute the NSW Department of Primary Industries as the owner. Disclaimer: The information contained in this publication is based on knowledge and understanding at the time of writing (August 2016). However, because of advances in knowledge, users are reminded of the need to ensure that information upon which they rely is up to date and to check currency of the information with the appropriate officer of the Department of Primary Industries or the user’s independent adviser. *Before July 2004, this report series was published by NSW Fisheries as the ‘NSW Fisheries Final Report Series’ with ISSN 1440-3544. Then, following the formation of the NSW Department of Primary Industries it was published as the ‘NSW Department of Primary Industries – Fisheries Final Report Series’ with ISSN 1449-9967. It was then published by Industry & Investment NSW as the ‘Industry & Investment NSW – Fisheries Final Report Series’ with ISSN 1837-2112. It is now published as the ‘Fisheries Final Report Series’ with ISSN 2204-8669. Knight Distribution and conservation status of the endangered Oxleyan pygmy perch in NSW Contents List of tables ............................................................................................................................. iii List of figures ............................................................................................................................ v Acknowledgments .................................................................................................................. vii Abbreviations .......................................................................................................................... vii Non-technical summary ......................................................................................................... viii Key words ................................................................................................................................. viii Summary .................................................................................................................................. viii Introduction ............................................................................................................................... 1 Background ................................................................................................................................. 1 Oxleyan pygmy perch ................................................................................................................. 2 Rationale for the Project .......................................................................................................................... 3 Methods ..................................................................................................................................... 7 Study area................................................................................................................................... 7 Location and extent of each survey area ................................................................................................ 7 Environmental characteristics ................................................................................................................. 9 Land use ................................................................................................................................................ 11 Site selection............................................................................................................................. 12 General site selection procedures ......................................................................................................... 12 Sites sampled for survey 1 .................................................................................................................... 14 Sites sampled for survey 2 .................................................................................................................... 15 Fish sampling protocol .............................................................................................................. 16 Habitat assessment................................................................................................................... 17 General habitat assessment .................................................................................................................. 17 Assessment of Oxleyan pygmy perch habitat ....................................................................................... 17 Additional habitat assessment undertaken during survey 1 .................................................................. 18 Data management..................................................................................................................... 19 Survey 1: Distributional Limits of the Oxleyan Pygmy Perch in New South Wales ........... 20 Distribution, total catch and sampling effectiveness .................................................................. 20 Relative abundance and population structure of Oxleyan pygmy perch ............................................... 25 Assessment of habitats supporting Oxleyan pygmy perch ................................................................... 26 Additional habitat assessment of all sites ............................................................................................. 30 Survey 2: Distribution of the Oxleyan Pygmy Perch in Bundalung and Yuraygir National Park ........................................................................................................................... 33 Distribution and total catch ........................................................................................................ 33 Relative abundance and population structure of Oxleyan pygmy perch ............................................... 42 i NSW Department of Primary Industries, August 2016 Knight Distribution and conservation status of the endangered Oxleyan pygmy perch in NSW Assessment of habitats supporting Oxleyan pygmy perch ................................................................... 44 General Discussion and Recommendations ......................................................................... 49 Distribution of the Oxleyan pygmy perch ................................................................................... 49 Conservation status of extant NSW populations ........................................................................ 54 Other species and habitats of conservation significance ........................................................... 56 Summary of recommendations ................................................................................................. 57 References............................................................................................................................... 59 Appendices .............................................................................................................................. 69 Appendix 1 ................................................................................................................................ 69 Appendix 2 ............................................................................................................................... 73 Appendix 3 ................................................................................................................................ 77 Appendix 4 ............................................................................................................................... 80 Appendix 5 ................................................................................................................................ 81 Appendix 6 ................................................................................................................................ 82 Appendix 7 ................................................................................................................................ 83 Appendix 8 ................................................................................................................................ 85 Appendix 9 ................................................................................................................................ 86 Appendix 10 .............................................................................................................................. 87 Appendix 11 .............................................................................................................................. 88 ii NSW Department of Primary Industries, August 2016 Knight Distribution and conservation status of the endangered Oxleyan pygmy perch in NSW List of tables Table 1 Freshwater fish
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