000 02256nam  2200313za 4500
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008150406s1998    oncd    ob   f000 0 eng d
040 |aCaOODSP|beng
041 |aeng|bfre
043 |an-cn---
0861 |aFs70-1/1998-94E-PDF
1001 |aLilly, G. R.,|d1945-
24510|aSize-at-age and condition of cod in subdivision 3Ps as determined from bottom-trawl surveys (1972-1997) |h[electronic resource] / |cby G.R. Lilly.
260 |aOttawa : |bFisheries and Oceans Canada, |c1998.
300 |a29 p. : |bfig., graphs, tables.
4901 |aCanadian Stock Assessment Secretariat research document, |x1480-4883 ; |v98/94
504 |aIncludes bibliographical references (p. 9-10).
520 |aCod (Gadus morhua) in several areas of Atlantic Canada experienced pronounced declines in growth and condition during the late 1980s and early 1990s. The degree to which such changes occured in the stock off the south coast of Newfoundland (Subdivision 3Ps) is difficult to assess because the DFO bottom-trawl surveys have varied considerably in timing and there appear to be strong year effects in size-at-age data that have not yet been explained. The major purpose of this paper is to explore in more detail the size at age and condition data available from cod sampled during the surveys in 1972-1996 and to update the analyses with data collected in 1997. A second purpose is to document the method used to calculate the January 1 weights-at-age used during the 1998 assessment of 3Ps cod. The relative merits of commercial data and research vessel data are discussed, and the reasons for continuing to use commercial weights-at-age at this time are described.
69207|2gccst|aFisheries resources
69207|2gccst|aSalt water fish
69207|2gccst|aFishing area
69207|2gccst|aFisheries management
7101 |aCanada. |bDepartment of Fisheries and Oceans.
7102 |aCanada.|bCanadian Stock Assessment Secretariat.
830#0|aCanadian Stock Assessment Secretariat research document,|x1480-4883 ; |v98/94|w(CaOODSP)9.507740
85640|qPDF|s166 KB|uhttps://publications.gc.ca/collections/collection_2015/mpo-dfo/Fs70-1-1998-94-eng.pdf