00000nam 2200000zi 4500 9.949323 CaOODSP 20250530144521 m o d f cr mn||||||||| 250320e197904##bcca obs f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-bc pn----- x5x7 Fs97-4/1511E-PDF Fs97-4/1511 Ketchen, K. S., author. An overview of the Strait of Georgia winter trawl fishery, 1951-52 to 1977-78 / by K.S. Ketchen. Nanaimo, British Columbia : Department of Fisheries and Oceans, Fisheries and Marine Service, Resource Services Branch, Pacific Biological Station, April 1979. ©1979 1 online resource (iv, 63 pages) : illustrations. text txt rdacontent computer c rdamedia online resource cr rdacarrier Fisheries and Marine Service manuscript report, 0701-7618 ; 1511 Digitized edition from print [produced by Department of Fisheries and Oceans]. Includes bibliographical references (pages 17-19). "Statistics of catch and effort for a 27-yr period have been examined to identify trends in landings and relative abundance of groundfish, with special reference to foodfish species consisting primarily of Pacific cod. A downward trend in fishing effort occurred throughout the study period, whereas catch and CPUE declined only until about 1968-69 after which there was a sharp reversal of trend. CPUE in the mid-1970's was as high or higher than that in the early 1950's, but it is uncertain whether the same can be said for relative abundance because efficiency of the unit of effort may have increased. An indicator of profitability shows a downward trend through most of the study period. It is hypothesized that relatively high effort in early years led to overfishing; that after a certain point in the decline of fishing effort, foodfish stocks began to rebuild; and that continued low profitability discouraged a resurgence of effort at least until 1977-78"--Abstract, page iii. Includes abstracts in English and French. Trawls and trawling Georgia, Strait of (B.C. and Wash.) Statistics. Trawls and trawling Catch effort Georgia, Strait of (B.C. and Wash.) Statistics. Chalutage Géorgie, Détroit de (C.-B. et Wash.) Statistiques. Chalutage Effort de pêche Géorgie, Détroit de (C.-B. et Wash.) Statistiques. Statistics lcgft Statistiques rvmgf Canada. Fisheries and Marine Service, issuing body. Pacific Biological Station (1972- ), issuing body. Manuscript report (Canada. Fisheries and Marine Service) 1511. (CaOODSP)9.924185 PDF 1.76 MB https://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-4/Fs97-4-1511-eng.pdf