Research Document 2012/096
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Document de recherche 2012/096
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Maritimes Region
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Région des Maritimes
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Population dynamics of Northwest Atlantic porbeagle (Lamna nasus), with an assessment of status and projections for recovery
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Dynamique des populations de la maraîche de l’Atlantique Nord-Ouest (Lamna nasus), avec une évaluation de la situation et des prévisions de rétablissement
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S.E. Campana, A.J.F. Gibson, M. Fowler, A. Dorey, and W. Joyce
Population Ecology Division
Science Branch, Maritimes Region
Department of Fisheries and Oceans
Bedford Institute of Oceanography
P.O. Box 1006, 1 Challenger Drive
Dartmouth, Nova Scotia B2Y 4A2
TABLE OF CONTENTS
Abstract iii
Résumé iv
Introduction 1
Population Biology 2
Morphometry 2
Stock Structure 2
Age, Growth, Longevity and Natural Mortality 3
Porbeagle Reproduction 3
Temperature, Depth and Feeding 3
Porbeagle Shark Survey 4
The Fishery 5
Landings 5
Location and Size Composition of the Catch 5
Discards 6
Population Model – Input Data 8
Commercial Catch Rates (CPUE) 8
Catch at Length 9
Tagging Data 9
Population Model 9
Population Dynamics in the Model 9
Commercial Fisheries 10
Initial Conditions 11
Predictions from the Model 11
The Tagged Population 12
Likelihood Equations 13
The Production Model and Reference Points 14
Population Viability Analysis 15
Results 16
Fits to the Data 16
Population Dynamics 17
Reference Points 17
Trends in Abundance and Exploitation 18
Population Status 18
Recovery Trajectories 18
Discussion 18
References 21
Tables 25
Figures 40
Correct citation for this publication:
Campana, S.E., Gibson, A.J.F., Fowler, M., Dorey, A. and Joyce, W. 2013. Population dynamics of Northwest Atlantic porbeagle (Lamna nasus), with an assessment of status and projections for recovery. DFO Can. Sci. Advis. Sec. Res. Doc. 2012/096. iv + 84 p.
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