Un modèle à effets mixtes simple pour lisser et extrapoler les poids selon l’âge des morues de la sous-division 3Ps

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Language of the publication
French
Date
2023
Type
Report
Author(s)
  • Cadigan, N.
Publisher
Pêches et Océans Canada, Secrétariat canadien des avis scientifiques

Abstract

Good estimates of weight-at-age for fishery catches and the stock are necessary for more reliable stock assessment and projections. I use a simple model to filter out “noise” in the 3Ps cod weight-at-age estimates, and to fill in missing values, especially for older ages and the age 14+ group that will be used in assessment models for the stock. The weight model is applied to estimated weight-at-age from fishery monitoring activities and also weight-at-age from the Fisheries and Oceans Canada (DFO) Spring research vessel (RV) survey which are assumed to represent weight-at-age in the stock. The other important model inputs are information about the precision of sampling estimates of weight-at-age which the model uses to help distinguish between population variability and measurement error. The model fits the fishery weights-at-age closely for those ages with low measurement error coefficients of variation (CVs). The survey weights-at-age have more between-year variability and presumably higher CVs and therefore the model did not fit these data as well but did capture the overall trends in the weights-at-age over time.

Description

1 online resource (iv, 50 pages) : charts

Subject

  • Nature and environment,
  • Water

Pagination

iv, 50 pages

Identifiers

Government document number
Fs70-5/2023-024F-PDF
ISBN
9780660479767
ISSN
2292-4272

Report

Report no.
2023/024
Series title
Document de recherche (Secrétariat canadien des avis scientifiques)

Citation(s)

Cadigan, N. 2023. Un modèle à effets mixtes simple pour lisser et extrapoler les poids selon l’âge pour la morue présente dans la sous-division 3Ps. Secr. can. des avis. sci. du MPO. Doc. de rech. 2023/024. iv + 50 p.

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Fisheries

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