00000nam 2200000zi 4500 9.952818 CaOODSP 20250627134807 m o d f cr mn||||||||| 250627e198701##bccab ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-bc n-us-wa pn----- x4x8 Fs97-4/1905E-PDF Fs97-4/1905E Westrheim, S. J., author. Stock assessment of Pacific cod (Gadus macrocephalus) in Georgia and Juan de Fuca Straits, 1954-84 / by S.J. Westrheim and R.P. Foucher. Nanaimo, British Columbia : Department of Fisheries and Oceans, Fisheries Research Branch, Pacific Biological Station, January 1987. ©1987 1 online resource (iv, 84 pages) : illustrations, maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian manuscript report of fisheries and aquatic sciences, 0706-6473 ; no. 1905 Digitized edition from print [produced by Department of Fisheries and Oceans]. Includes bibliographical references (pages 23-25). "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. Includes abstracts in English and French. Pacific cod Georgia, Strait of (B.C. and Wash.) Pacific cod Juan de Fuca, Strait of (B.C. and Wash.) Pacific cod fisheries Georgia, Strait of (B.C. and Wash.) Pacific cod fisheries Juan de Fuca, Strait of (B.C. and Wash.) Fish stock assessment Georgia, Strait of (B.C. and Wash.) Fish stock assessment Juan de Fuca, Strait of (B.C. and Wash.) Morue du Pacifique Géorgie, Détroit de (C.-B. et Wash.) Morue du Pacifique Juan de Fuca, Détroit de (C.-B. et Wash.) Morue du Pacifique Pêche commerciale Géorgie, Détroit de (C.-B. et Wash.) Morue du Pacifique Pêche commerciale Juan de Fuca, Détroit de (C.-B. et Wash.) Ressources halieutiques Évaluation Géorgie, Détroit de (C.-B. et Wash.) Ressources halieutiques Évaluation Juan de Fuca, Détroit de (C.-B. et Wash.) Canada. Department of Fisheries and Oceans, issuing body. Pacific Biological Station (1972- ), issuing body. Canadian manuscript report of fisheries and aquatic sciences ; no. 1905. (CaOODSP)9.505211 PDF 1.82 MB https://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-4/Fs97-4-1905-eng.pdf