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The Stock Structure of Northern and Western Australian Spanish Mackerel

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The Stock Structure of Northern and Western Australian Spanish Mackerel Fishery Report No. 88 The Stock Structure of Northern and Western Australian Spanish Mackerel R C Buckworth1, S J Newman2, J R Ovenden3, R J G Lester4 and G R McPherson5 1 Fisheries, Department of Primary Industry, Fisheries & Mines, GPO Box 3000, Darwin NT 0801, Australia. 2 Western Australian Marine Research Laboratories, Department of Fisheries, Government of Western Australia, P.O. Box 20, North Beach, WA 6920, Australia. 3 Molecular Fisheries Laboratory, Queensland Department of Primary Industries and Fisheries, University of Queensland, PO Box 6097 St Lucia, Qld 4067, Australia. 4 School of Molecular and Microbial Sciences, University of Queensland, Qld 4072, Australia. 5 Fisheries, Queensland Department of Primary Industries & Fisheries, Northern Fisheries Centre, PO Box 5396, Cairns, Qld 4870, Australia. FRDC Project No. 1998/159 Title: The Stock Structure of Northern and Western Australian Spanish Mackerel By R C Buckworth, S J Newman, J R Ovenden, R J G Lester and G R McPherson Copyright: © 2007 Fisheries Research and Development Corporation, Northern Territory Government, Queensland Government, Queensland University and Western Australian Government. Disclaimer: 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. The information provided by Fisheries, Department of Primary Industry, Fisheries and Mines (DPIFM) is given in good faith and is accurate and current at the time of publication. DPIFM accepts no responsibility for any loss or liability which may result from the application of this information. Bibliography: Buckworth, R. C., Newman, S. J., Ovenden, J. R., Lester, R. J. G., and McPherson, G. R. (2007). The Stock Structure of Northern and Western Australian Spanish Mackerel. Final Report, Fisheries Research & Development Corporation Project 1998/159. Department of Primary Industry, Fisheries and Mines, Northern Territory Government, Australia. Fishery Report 88, i-vi, 225 p. ISBN 0 7245 4726 6 Corresponding author: Dr Rik Buckworth, Department of Primary Industry, Fisheries and Mines GPO Box 3000, Darwin, NT 0801 Australia Phone: +61 8 8999 2144 Email: [email protected] CONTENTS NON TECHNICAL SUMMARY .............................................................................. 1 Objectives:......................................................................................................... 1 Outcomes Achieved to Date ............................................................................. 2 Summary ........................................................................................................... 4 ACKNOWLEDGEMENTS...................................................................................... 8 CHAPTER 1 INTRODUCTION .............................................................................. 9 Overview ........................................................................................................... 9 Background ..................................................................................................... 11 Need................................................................................................................ 13 Objectives........................................................................................................ 14 Methods........................................................................................................... 15 Development of sampling approach using intrinsic time scales and stock structure hypotheses....................................................................... 15 Sampling................................................................................................ 17 Analyses ................................................................................................ 18 Results and Discussion................................................................................... 19 Benefits............................................................................................................ 23 Further Development....................................................................................... 24 Planned Outcomes.......................................................................................... 25 Conclusion....................................................................................................... 25 References ...................................................................................................... 27 CHAPTER 2 HISTORICAL STOCK DEFINITION RESEARCH ON SCOMBEROMORUS COMMERSON IN QUEENSLAND WATERS ........................................ 30 Historical Development ................................................................................... 30 Historical industry understanding of narrow-barred Spanish mackerel life ........................................................................................................ 30 Department of Primary Industries Spanish mackerel life history research ........................................................................................................ 34 FIRTA- and FRDC-funded stock definition research............................. 37 FRDC-funded mackerel movement model of 1981-1988...................... 40 Re-assessment of the movement model prior to and during the FRDC mackerel stock assessment study 1998-2002 ................................................ 53 References ...................................................................................................... 55 Appendix 1: During season fish movement model......................................... 58 Appendix 2: Post-spawning season fish movement model............................ 59 Appendix 3: Pre-spawning season fish movement model ............................. 60 CHAPTER 3 SPATIAL SUBDIVISION OF ADULT ASSEMBLAGES OF SPANISH MACKEREL, SCOMBEROMORUS COMMERSON (PISCES: SCOMBRIDAE) FROM WESTERN, NORTHERN AND EASTERN AUSTRALIAN WATERS THROUGH STABLE ISOTOPE RATIO ANALYSIS OF SAGITTAL OTOLITH CARBONATE ................................................................................ 61 Abstract ........................................................................................................... 61 Introduction...................................................................................................... 62 Materials and Methods.................................................................................... 64 Sampling design .................................................................................... 64 THE STOCK STRUCTURE OF NORTHERN AND WESTERN AUSTRALIAN SPANISH MACKEREL iii Otolith preparation .................................................................................71 Statistical analysis..................................................................................71 Results.............................................................................................................72 Discussion .......................................................................................................85 Fishery management implications ...................................................................87 Acknowledgements..........................................................................................91 References ......................................................................................................91 CHAPTER 4 GENETIC POPULATION STRUCTURE OF SPANISH MACKEREL ...........93 Abstract............................................................................................................93 Introduction ......................................................................................................94 Population genetics for fisheries stock structure analyses ....................94 Temporal comparisons of allozyme data...............................................96 History of allozyme genetics of Spanish mackerel ................................97 Need ................................................................................................................97 Objectives ........................................................................................................98 Methods ...........................................................................................................99 Genetic population ptructure..................................................................99 Temporal comparison of allozyme data...............................................106 Results...........................................................................................................108 Genetic population structure................................................................108 Temporal comparison of allozyme data...............................................122 Discussion .....................................................................................................134 Population structure.............................................................................134 Allozyme
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