00000nam 2200000za 4500 9.805968 CaOODSP 20221107135800 cr ||||||||||| 150406s2000 oncd ob f000 0 eng d CaOODSP eng eng fre n-cn--- Fs70-1/2000-089E-PDF Shelton, P. A. Northern cod recruitment before, during and after the collapse [electronic resource] / Peter A. Shelton and Don E. Stansbury. Ottawa : Fisheries and Oceans Canada, 2000. 18 p. : fig., graphs, tables. Canadian Stock Assessment Secretariat research document, 1480-4883 ; 2000/089 Includes bibliographical references (p. 8). 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. gccst Fisheries resources gccst Salt water fish gccst Fishing area gccst Fisheries management Stansbury, D. E. Canada. Department of Fisheries and Oceans. Canada. Canadian Stock Assessment Secretariat. Canadian Stock Assessment Secretariat research document, 1480-4883 ; 2000/089 (CaOODSP)9.507740 PDF 88 KB https://publications.gc.ca/collections/collection_2015/mpo-dfo/Fs70-1-2000-089-eng.pdf