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040 |aCaOODSP|beng|erda|cCaOODSP
0410 |aeng|beng|bfre
043 |an-cn-bc|an-us-wa|apn-----
045 |ax4x8
0861 |aFs97-4/1905E-PDF|zFs97-4/1905E
1001 |aWestrheim, S. J., |eauthor.
24510|aStock assessment of Pacific cod (Gadus macrocephalus) in Georgia and Juan de Fuca Straits, 1954-84 / |cby S.J. Westrheim and R.P. Foucher.
264 1|aNanaimo, British Columbia : |bDepartment of Fisheries and Oceans, Fisheries Research Branch, Pacific Biological Station, |cJanuary 1987.
264 4|c©1987
300 |a1 online resource (iv, 84 pages) : |billustrations, maps.
336 |atext|btxt|2rdacontent
337 |acomputer|bc|2rdamedia
338 |aonline resource|bcr|2rdacarrier
4901 |aCanadian manuscript report of fisheries and aquatic sciences, |y0706-6473 ; |vno. 1905
500 |aDigitized edition from print [produced by Department of Fisheries and Oceans].
504 |aIncludes bibliographical references (pages 23-25).
5203 |a"Four important stocks of Pacific cod were delineated in Georgia and Juan de Fuca straits, primarily based on results of extensive Canadian and U.S. tagging experiments during 1954-79. All four stocks were exploited seasonally, almost exclusively by on-bottom trawls. Two stocks were resident year-round (MSA 14 and Gulf Islands), and two were itinerant and seasonal (Nanoose and MSA 19). Standardized landing statistics and landings-at-age were employed to assess each stock. No stock exhibited symptoms of recruitment overfishing, despite relatively high estimates of total mortality rate (Z = 1.03 - 1.50). Estimates of M (0.59) and q (1.373 x 10 ⁻³) were obtained from only one stock (MSA 14), by regressing Z on effort. Yield-per-recruit analysis indicated that maximizing YPR was impractical because the required mesh size was too large for the mixed-species fishery. Current legal, minimum mesh (4.25", synthetic materials) was satisfactory for maximizing catch profitability (YPR/F)"--Abstract, page iii.
546 |aIncludes abstracts in English and French.
650 0|aPacific cod|zGeorgia, Strait of (B.C. and Wash.)
650 0|aPacific cod|zJuan de Fuca, Strait of (B.C. and Wash.)
650 0|aPacific cod fisheries|zGeorgia, Strait of (B.C. and Wash.)
650 0|aPacific cod fisheries|zJuan de Fuca, Strait of (B.C. and Wash.)
650 0|aFish stock assessment|zGeorgia, Strait of (B.C. and Wash.)
650 0|aFish stock assessment|zJuan de Fuca, Strait of (B.C. and Wash.)
650 6|aMorue du Pacifique|zGéorgie, Détroit de (C.-B. et Wash.)
650 6|aMorue du Pacifique|zJuan de Fuca, Détroit de (C.-B. et Wash.)
650 6|aMorue du Pacifique|xPêche commerciale|zGéorgie, Détroit de (C.-B. et Wash.)
650 6|aMorue du Pacifique|xPêche commerciale|zJuan de Fuca, Détroit de (C.-B. et Wash.)
650 6|aRessources halieutiques|xÉvaluation|zGéorgie, Détroit de (C.-B. et Wash.)
650 6|aRessources halieutiques|xÉvaluation|zJuan de Fuca, Détroit de (C.-B. et Wash.)
7101 |aCanada. |bDepartment of Fisheries and Oceans, |eissuing body.
7102 |aPacific Biological Station (1972- ), |eissuing body.
830#0|aCanadian manuscript report of fisheries and aquatic sciences ;|vno. 1905.|w(CaOODSP)9.505211
85640|qPDF|s1.82 MB|uhttps://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-4/Fs97-4-1905-eng.pdf