Un modèle à effets mixtes simple pour lisser et extrapoler les poids selon l’âge des morues de la sous-division 3Ps
- 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
Relation
- Is translation of:
- https://open-science.canada.ca/handle/123456789/1557
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.