00000nam 2200000zi 4500 9.950112 CaOODSP 20250429074106 m o d f cr mn||||||||| 250414e198804##bccb ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-bc pn----- x8x8 Fs97-6/1615E-PDF Fs97-6/1615E Olsen, N. H., author. Swiftsure and Amphitrite Banks juvenile salmon survey, September 25-29, October 9-13, November 16-18 and November 23-25, 1987 / by N.H. Olsen, J.F.T. Morris, and M.C. Healey. Nanaimo, British Columbia : Department of Fisheries and Oceans, Fisheries Research Branch, Pacific Biological Station, April 1988. ©1988 1 online resource (iv, 25 pages) : maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian technical report of fisheries and aquatic sciences, 0706-6457 ; no. 1615 Digitized edition from print [produced by Department of Fisheries and Oceans]. Includes bibliographical references (page 6). "Aggregations of juvenile chinook (Oncorhynchus tshawytscha) and coho (O. kisutch) salmon are known to exist over Swiftsure and other banks, which lie on the continental shelf off southwest Vancouver Island. These aggregations are hypothesized to form in response to eddies caused by tidal current rectification. In the spring and fall, respectively, the summer and winter circulation over the continental shelf undergo a transition phase during which eddying and other stable components of shelf circulation break down. We hypothesize that these events cause the dispersal and redistribution of juvenile salmon aggregations. Employing commercial trolling methods, we conducted exploratory surveys on Swiftsure and Amphitrite Banks in September, October, and November of 1987 to obtain data on juvenile abundance, distribution, and size and species compositions before and during the fall transition. This report summarizes the information obtained"--Abstract, page iii. Includes abstracts in English and French. Chinook salmon Infancy British Columbia Pacific Coast. Coho salmon Infancy British Columbia Pacific Coast. Fish surveys British Columbia Pacific Coast. Saumoneau quinnat Colombie-Britannique Pacifique, Côte du. Saumoneau coho Colombie-Britannique Pacifique, Côte du. Inventaires ichtyologiques Colombie-Britannique Pacifique, Côte du. Canada. Department of Fisheries and Oceans, issuing body. Pacific Biological Station (1972- ), issuing body. Canadian technical report of fisheries and aquatic sciences ; no. 1615. (CaOODSP)9.504449 PDF 712 KB https://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-6/Fs97-6-1615-eng.pdf