00000nam 2200000zi 4500 9.933683 CaOODSP 20250702130746 m o d f cr mn||||||||| 240208e202403 oncab ob f000 0 eng d 9780660701462 CaOODSP eng rda CaOODSP n-cn-nf ln----- x5y1 Fs70-5/2024-015E-PDF Champagnat, Juliette, author. Development of a state space assessment model for cod (Gadus morhua) in NAFO Subdivision 3Ps / J. Champagnat, J. Vigneau, D.A. Varkey, P. Regular, D.W. Ings, J. Babyn, J. Morgan. Ottawa ON : Canadian Science Advisory Secretariat (CSAS), March 2024. ©2024 1 online resource (iv, 98 pages) : illustrations (chiefly colour), colour map. text txt rdacontent computer c rdamedia online resource cr rdacarrier Research document, 1919-5044 ; 2024/015 Issued also in French under title: Élaboration d'un modèle à espace d'état pour l'évaluation du stock de morue (Gadus morhua) dans la sous-division 3Ps de l'OPANO. Includes bibliographical references (pages 13-14). "A state-space assessment model (SAM) that incorporates commercial catches and survey indices is developed for the 3Ps cod stock. It allows for process and observations errors and uses random walks in fishing mortality rate to estimate time variant selectivity. The model provides estimates of stock size, fishing mortality and recruitment together with their uncertainties and would eventually have the ability to provide stochastic forecasts. The objective of the study is to achieve an accurate estimation of the stock dynamics and better account for uncertainty. Four runs of the model are presented here with different options on mortality and survey inputs. Runs produce comparable estimation but lead to different stock status in the recent period. They also perform differently in terms of retrospective analysis, residual patterns, and description of latent processes. Three runs out of four produced outputs with concerning issues, so they could not be accepted as basis for assessment advice. The last one (called sentinel run) was kept as a "control model," which means it would be use for comparison purpose alongside with the accepted model (i.e., state-space model [HYBRID])"--Abstract, page iv. Atlantic cod Newfoundland and Labrador Atlantic Coast. Atlantic cod fisheries Newfoundland and Labrador Atlantic Coast. Fish stock assessment Newfoundland and Labrador Atlantic Coast. State-space methods. Canadian Science Advisory Secretariat, issuing body. Canada. Department of Fisheries and Oceans. Newfoundland and Labrador Region, issuing body. Élaboration d'un modèle à espace d’état pour l'évaluation du stock de morue (Gadus morhua) dans la sous-division 3Ps de l'OPANO / (CaOODSP)9.933684 Research document (Canadian Science Advisory Secretariat) 2024/015. (CaOODSP)9.507396 PDF 11.92 MB https://publications.gc.ca/collections/collection_2024/mpo-dfo/fs70-5/Fs70-5-2024-015-eng.pdf