000 02457nam  2200325za 4500
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008150406s2000    oncd    ob   f000 0 eng d
040 |aCaOODSP|beng
041 |aeng|bfre
043 |an-cn---
0861 |aFs70-1/2000-081E-PDF
1001 |aHealey, B. P.
24510|aEstimating pup production and population size of the northwest Atlantic harp seal (Phoca groenlandica) |h[electronic resource] / |cB.P. Healey and G.B. Stenson.
260 |aOttawa : |bFisheries and Oceans Canada, |c2000.
300 |a28 p. : |bfig., graphs, tables.
4901 |aCanadian Stock Assessment Secretariat research document, |x1480-4883 ; |v2000/081
504 |aIncludes bibliographical references (p. 13-16).
520 |aPup 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.
69207|2gccst|aFisheries resources
69207|2gccst|aSeals
69207|2gccst|aFishing area
69207|2gccst|aFisheries management
7001 |aStenson, Garry B. |q(Garry Bruce), |d1954-
7101 |aCanada. |bDepartment of Fisheries and Oceans.
7102 |aCanada.|bCanadian Stock Assessment Secretariat.
830#0|aCanadian Stock Assessment Secretariat research document,|x1480-4883 ; |v2000/081|w(CaOODSP)9.507740
85640|qPDF|s220 KB|uhttps://publications.gc.ca/collections/collection_2015/mpo-dfo/Fs70-1-2000-081-eng.pdf