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Migratory Dynamics and Recruitment of Snapper, Pagrus Auratus, in Victorian Waters

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Migratory Dynamics and Recruitment of Snapper, Pagrus Auratus, in Victorian Waters Migratory dynamics and recruitment of snapper, Pagrus auratus, in Victorian waters Paul A. Hamer and Gregory P. Jenkins Project No. 1999/134 FRDC Report 99/134 Migratory dynamics and recruitment of snapper, Pagrus auratus, in Victorian waters Paul A. Hamer and Gregory P. Jenkins Marine and Freshwater Systems, Primary Industries Research Victoria, Department of Primary Industries Queenscliff March 2007 1999/134 Migratory dynamics and recruitment of snapper in Victoria i FRDC Report 99/134 © Fisheries Research and Development Corporation and Primary Industries Research Victoria. [2007] This work is copyright. Except as permitted under the Copyright Act 1968 (Cth), no part of this publication 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. The Fisheries Research and Development Corporation plans, invests in and manages fisheries research and development throughout Australia. It is a statutory authority within the portfolio of the federal Minister for Agriculture, Fisheries and Forestry, jointly funded by the Australian Government and the fishing industry. ISBN 978-1-74199-078-2 Preferred way to cite: Hamer PA, Jenkins GP (2007) Migratory dynamics and recruitment of snapper, Pagrus auratus, in Victorian waters. Final report to Fisheries Research and Development Corporation Project No. 199/134. Primary Industries Research Victoria, Marine and Freshwater Systems, Queenscliff. Published by Primary Industries Research Victoria, Department of Primary Industries, Queenscliff, Victoria, 3225. Formatted/designed by Primary Industries Research Victoria Queenscliff Printed by PIRVic Queenscliff, Victoria DISCLAIMER The authors do not warrant that the information in this book is free from errors or omissions. The authors do not accept any form of liability, be it contractual, tortious or otherwise, for the contents of this book or for any consequences arising from its use or any reliance placed upon it. The information, opinions and advice contained in this book may not relate to, or be relevant to, a reader's particular circumstances. Opinions expressed by the authors are the individual opinions of those persons and are not necessarily those of the publisher or research provider. Migratory dynamics and recruitment of snapper in Victoria ii FRDC Report 99/134 Table of Contents Migratory dynamics and recruitment of snapper, Pagrus auratus, in Victorian waters .... 1 NON-TECHNICAL SUMMARY: .............................................................................................. 2 OUTCOMES ACHIEVED TO DATE.....................................................................................................................2 NON TECHNICAL SUMMARY.............................................................................................................................3 Acknowledgments ....................................................................................................................... 5 1. Background............................................................................................................................... 6 1.1 Snapper – biology................................................................................................................................................6 1.2 Victorian snapper fishery...................................................................................................................................6 1.3 Juvenile recruitment dynamics .........................................................................................................................7 1.4 Linkages between juvenile sources and fishery recruitment......................................................................7 1.5 Otolith chemistry – natural tags........................................................................................................................7 1.6 Migratory dynamics ............................................................................................................................................8 1.7 Report outline.......................................................................................................................................................8 1.8 Need .....................................................................................................................................................................10 1.9 Objectives............................................................................................................................................................11 2. Spatial and temporal variation in recruitment of 0-age snapper in Victorian waters . 12 2.1 Introduction ........................................................................................................................................................12 2.2 Methods...............................................................................................................................................................14 2.2.1 Sampling locations.......................................................................................................................................14 2.2.2 Plumb-staff beam trawl...............................................................................................................................14 2.2.3 Water temperature.......................................................................................................................................14 2.2.4 Data analyses................................................................................................................................................15 2.3 Results..................................................................................................................................................................16 2.3.1 Spatial and temporal variation among estuaries:....................................................................................16 2.3.2 Variation within estuaries...........................................................................................................................17 2.3.3 Size distributions..........................................................................................................................................18 2.3.4 Water temperature.......................................................................................................................................20 2.4 Discussion...........................................................................................................................................................21 2.4.1 Interannual recruitment variation .............................................................................................................21 2.4.2 Variation within bays and estuaries..........................................................................................................22 2.4.3 Temperature and recruitment variation in Port Phillip Bay..................................................................22 2.4.4 Conclusions...................................................................................................................................................23 Migratory dynamics and recruitment of snapper in Victoria iii FRDC Report 99/134 3. Spatio and temporal variation in otolith chemistry of 0-age snapper in Victorian waters ........................................................................................................................................... 24 3.1 Introduction ....................................................................................................................................................... 24 3.2 Methods .............................................................................................................................................................. 25 3.2.1 Fish collection .............................................................................................................................................. 25 3.2.2 Otolith preparation ..................................................................................................................................... 27 3.2.3 Otolith analysis............................................................................................................................................ 28 3.2.4 Data analysis................................................................................................................................................ 30 3.3 Results................................................................................................................................................................. 31 3.3.1 Fish size and otolith weight....................................................................................................................... 31 3.3.2 Individual elements .................................................................................................................................... 31 3.3.3 Multi-element otolith chemistry................................................................................................................ 35 3.3.4 Influence of temporal variation in multi-elemental otolith chemistry on spatial discrimination.... 37 3.4 Discussion .........................................................................................................................................................
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