00000nam 2200000zi 4500 9.895603 CaOODSP 20221107174055 m o d f cr bn||||||||| 210122s1987 nscbd ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-nk n-cn-ns Fs70-8/87-36E-PDF Buerkle, U‏., author. Results of the 1986 and 1987 winter acoustic surveys of NAFO div. 4WX herring stocks / U. Buerkle. [Dartmouth, N.S.] : Canadian Atlantic Fisheries Scientific Advisory Committee ; St. Andrews, New Brunswick, Canada : Department of Fisheries and Oceans, Marine Fish Division, Biological Station, [1987?] 1 online resource (19 pages) : maps, graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier CAFSAC research document ; no. 87/36 Cover title. "Not to be cited without permission of the author." Includes bibliographical references (pages 6-7). "Results of the 1986 and 1987 winter acoustic surveys of herring are described and compared to results from the 1984 and 1985 surveys. The replicate surveys in 1986 and in 1987, were similar to those done in 1984 and 1985, and showed similar herring distributions. The herring were concentrated in varying numbers of fish patches in the southern portion and in the approaches to Chedabucto Bay, N.S. The fish patches changed shape and size with time and replicate surveys produced a wide range of estimates of acoustic abundance. The maximum acoustic estimate produced each year is taken as the best estimate of the quantity of fish present. The acoustic estimates are converted to herring biomass by a target strength estimate determined for in-situ herring in Denmark. Herring abundance detected by the surveys has increased since 1984 by about 23% per year"--Abstract, page 2. Includes abstract and series statement in French. Atlantic herring fisheries Scotian Shelf. Atlantic herring fisheries Fundy, Bay of. Fish stock assessment Scotian Shelf. Fish stock assessment Fundy, Bay of. Hareng Pêche commerciale Néo-écossaise, Plateforme. Hareng Pêche commerciale Fundy, Baie de. Ressources halieutiques Évaluation Néo-écossaise, Plateforme. Ressources halieutiques Évaluation Fundy, Baie de. Canadian Atlantic Fisheries Scientific Advisory Committee, issuing body. Canada. Dept. of Fisheries and Oceans. Scotia-Fundy Region. Marine Fish Division, issuing body. CAFSAC research document (Canadian Atlantic Fisheries Scientific Advisory Committee) no. 87/36. (CaOODSP)9.869616 PDF 1.08 MB https://publications.gc.ca/collections/collection_2021/mpo-dfo/fs70-8/Fs70-8-87-36-eng.pdf