00000nam 2200000za 4500 9.804856 CaOODSP 20221107135519 cr ||||||||||| 150406s1999 oncdb ob f000 0 eng d eng fre n-cn--- Fs70-1/1999-21E-PDF Schweigert, J. F. Stock assessment for British Columbia herring in 1998 and forecasts of the potential catch in 1999 [electronic resource] / J. Schweigert, C. Fort, and R. Tanasichuk. Ottawa : Fisheries and Oceans Canada, 1999. 69 p. : fig., graphs, maps, tables. Canadian Stock Assessment Secretariat research document, 1480-4883 ; 99/21 Includes bibliographical references (p. 54-56). This report presents stock assessments from two analytical models which have been developed explicitly for British Columbia herring: (1) a modification of the escapement model described by Schweigert and Stocker (1988); and (2) a modification of the age-structured model described by Fournier and Archibald (1982). Both models reconstruct stock abundance for the period 1951-1998 and forecast pre-spawning abundance for the 1999 season. Forecasts of upcoming run size are based on the combination of estimates of surviving repeat spawners and newly recruited spawners which are presented as poor, average, and good, based on historical recruitment levels. gccst Fisheries resources gccst Salt water fish gccst Fishing area gccst Fisheries management Fort, C. Tanasichuk, Ronald W. Canada. Department of Fisheries and Oceans. Canada. Canadian Stock Assessment Secretariat. Canadian Stock Assessment Secretariat research document, 1480-4883 ; 99/21 (CaOODSP)9.507740 PDF 2.97 MB https://publications.gc.ca/collections/collection_2015/mpo-dfo/Fs70-1-1999-21-eng.pdf CaOODSP eng