00000nam 2200000za 4500 9.805938 CaOODSP 20221107135755 cr ||||||||||| 150406s2000 oncd ob f000 0 eng d CaOODSP eng eng fre n-cn--- Fs70-1/2000-081E-PDF Healey, B. P. Estimating pup production and population size of the northwest Atlantic harp seal (Phoca groenlandica) [electronic resource] / B.P. Healey and G.B. Stenson. Ottawa : Fisheries and Oceans Canada, 2000. 28 p. : fig., graphs, tables. Canadian Stock Assessment Secretariat research document, 1480-4883 ; 2000/081 Includes bibliographical references (p. 13-16). Pup production and population size of northwest Atlantic harp seals (Phoca groenlandica) for the period 1960 to 2000 were estimated using independent survey estimates of pup production, annual estimates of pregnancy rates, and age-structured removals. Removals included reported catch, estimated by-catch and assumed levels of seals killed but not landed (struck and lost). These data were fit to a three-parameter age structured population model that allows for differing assumptions of pup mortality. The two parameters estimated in the model are the pup selection parameter (s) and unaccounted mortality (m). The impact of assuming that the mortality of young seals (age class 0) was greater than that of seals one year of age and older (1+) was illustrated by using a fixed parameter (y) as the ratio of age class 0 mortality to that of older seals. Replacement yields were estimated using differing assumptions of the age structure of the harvest. The uncertainty associated with the estimates was determined by randomly re-sampling from within the sampling error of the pup production estimates. gccst Fisheries resources gccst Seals gccst Fishing area gccst Fisheries management Stenson, Garry B. (Garry Bruce), 1954- Canada. Department of Fisheries and Oceans. Canada. Canadian Stock Assessment Secretariat. Canadian Stock Assessment Secretariat research document, 1480-4883 ; 2000/081 (CaOODSP)9.507740 PDF 220 KB https://publications.gc.ca/collections/collection_2015/mpo-dfo/Fs70-1-2000-081-eng.pdf