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Stewart, J & Hughes, JM 2008, Determining Appropriate Sizes At Determining appropriate sizes at harvest for species shared by the commercial trap and recreational fisheries in New South Wales John Stewart and Julian M. Hughes NSW Department of Primary Industries Cronulla Fisheries Research Centre of Excellence PO Box 21 Cronulla NSW 2230 Australia FRDC Project No. 2004/035 February 2008 NSW Department of Primary Industries – Fisheries Final Report Series No. 97 ISSN 1449-9967 Determining appropriate sizes at harvest for species shared by the commercial trap and recreational fisheries in New South Wales February 2008 Authors: John Stewart & Julian M. Hughes Published By: NSW Department of Primary Industries (now incorporating NSW Fisheries) Postal Address: Cronulla Fisheries Research Centre of Excellence, PO Box 21, NSW, 2230 Internet: www.dpi.nsw.gov.au © NSW Department of Primary Industries and the Fisheries Research and Development Corporation This work is copyright. Except as permitted under the Copyright Act, no part of this reproduction may be reproduced by any process, electronic or otherwise, without the specific written permission of the copyright owners. Neither may information be stored electronically in any form whatsoever without such permission. DISCLAIMER The publishers do not warrant that the information in this report is free from errors or omissions. The publishers do not accept any form of liability, be it contractual, tortuous or otherwise, for the contents of this report for any consequences arising from its use or any reliance placed on it. The information, opinions and advice contained in this report may not relate to, or be relevant to, a reader’s particular circumstance. ISSN 1449-9967 (Note: Prior to July 2004, this report series was published as the ‘NSW Fisheries Final Report Series’ with ISSN number 1440-3544) Contents iii TABLE OF CONTENTS TABLE OF CONTENTS ..............................................................................................................................III LIST OF TABLES .......................................................................................................................................... V LIST OF FIGURES....................................................................................................................................... VI ACKNOWLEDGEMENTS ........................................................................................................................... X NON-TECHNICAL SUMMARY ................................................................................................................XI 1. INTRODUCTION...................................................................................................................................... 13 1.1. Background................................................................................................................................ 13 1.2. Need ........................................................................................................................................... 13 1.3. Objectives .................................................................................................................................. 13 2. GENERAL MATERIALS AND METHODS.................................................................................................... 14 2.1. Landings in NSW ....................................................................................................................... 14 2.2. Reproduction ............................................................................................................................. 15 2.3. Age and growth.......................................................................................................................... 17 2.4. Mortality estimates .................................................................................................................... 17 2.5. Market price............................................................................................................................... 18 2.6. Per recruit analyses ................................................................................................................... 18 2.7. Spawning potential ratio............................................................................................................ 18 2.8. Information fact sheets .............................................................................................................. 19 3. BIOLOGY AND FISHERY FOR RUBBERLIP MORWONG .............................................................................. 20 3.1. Introduction ............................................................................................................................... 20 3.2. Materials and methods .............................................................................................................. 20 3.3. Results........................................................................................................................................ 20 3.4. Discussion.................................................................................................................................. 38 4. BIOLOGY AND FISHERY FOR TARWHINE................................................................................................. 40 4.1. Introduction ............................................................................................................................... 40 4.2. Materials and methods .............................................................................................................. 41 4.3. Results........................................................................................................................................ 42 4.4. Discussion.................................................................................................................................. 63 5. BIOLOGY AND FISHERY FOR BLACKSPOT PIGFISH .................................................................................. 67 5.1. Introduction ............................................................................................................................... 67 5.2. Materials and methods .............................................................................................................. 67 5.3. Results........................................................................................................................................ 68 5.4. Discussion.................................................................................................................................. 87 6. BIOLOGY AND FISHERY FOR MAORI WRASSE ......................................................................................... 89 6.1. Introduction ............................................................................................................................... 89 6.2. Materials and methods .............................................................................................................. 89 6.3. Results........................................................................................................................................ 90 6.4. Discussion................................................................................................................................ 107 7. BIOLOGY AND FISHERY FOR RED ROCKCOD ......................................................................................... 109 7.1. Introduction ............................................................................................................................. 109 7.2. Materials and methods ............................................................................................................ 109 7.3. Results...................................................................................................................................... 110 7.4. Discussion................................................................................................................................ 130 8. BIOLOGY AND FISHERY FOR PEARL PERCH........................................................................................... 132 8.1. Introduction ............................................................................................................................. 132 8.2. Materials and methods ............................................................................................................ 133 8.3. Results...................................................................................................................................... 134 Project No. 2004/035 Biology of coastal fish, Stewart & Hughes iv Contents 8.4. Discussion ................................................................................................................................ 157 9. BIOLOGY AND FISHERY FOR OCEAN LEATHERJACKET .......................................................................... 161 9.1. Introduction.............................................................................................................................. 161 9.2. Materials and methods............................................................................................................. 161 9.3. Results ...................................................................................................................................... 162 9.4. Discussion ................................................................................................................................ 171 10. BIOLOGY
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