Northern cod recruitment before, during and after the collapse / Peter A. Shelton and Don E. Stansbury. : Fs70-1/2000-089E-PDF

This paper shows that clear recruitment signals are present in the research vessel and commercial catch at age data for northern cod from extension of jurisdiction to moratorium. There have been three main periods of strong recruitment, preceded and followed by brief periods of much lower recruitment. SPA provides good model fits to the first two pulses but is unable to reconcile survey and catch data with respect to the third pulse, under standard assumptions. This research document uses a diagnostic formulation that estimates unaccounted for deaths in the early 1990s to evaluate recruitment before and during the collapse. A relative recruitment strength series for the post-collapse period is reconstructed from a number of indices using an iterative reweighting procedure. Recruitment has decreased with the decline in spawner biomass and has been particularly low since the collapse.

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Renseignements sur la publication
Ministère/Organisme Canada. Department of Fisheries and Oceans.
Canada. Canadian Stock Assessment Secretariat.
Titre Northern cod recruitment before, during and after the collapse / Peter A. Shelton and Don E. Stansbury.
Titre de la série Canadian Stock Assessment Secretariat research document, 1480-4883 ; 2000/089
Type de publication Série - Voir l'enregistrement principal
Langue [Anglais]
Format Électronique
Document électronique
Note(s) Includes bibliographical references (p. 8).
Information sur la publication Ottawa : Fisheries and Oceans Canada, 2000.
Auteur / Contributeur Shelton, P. A.
Stansbury, D. E.
Description 18 p. : fig., graphs, tables.
Numéro de catalogue
  • Fs70-1/2000-089E-PDF
Descripteurs Fisheries resources
Salt water fish
Fishing area
Fisheries management
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