00000nam 2200000zi 4500 9.950043 CaOODSP 20250411104716 m o d f cr mn||||||||| 250411e198807##bccab ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-bc x4x8 Fs97-6/1638E-PDF Fs97-6/1638E Kadowaki, R., author. Stock assessment of early run Skeena River coho salmon and recommendations for management / by R.K. Kadowaki. Nanaimo, British Columbia : Department of Fisheries and Oceans, Biological Sciences Branch, Pacific Biological Station, July 1988. ©1988 1 online resource (iv, 29 pages) : illustrations, maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian technical report of fisheries and aquatic sciences, 0706-6457 ; no. 1638 Digitized edition from print [produced by Department of Fisheries and Oceans]. Includes bibliographical references (pages 10-11). "Concerns have previously been expressed for the stock status of early run Skeena River coho salmon because of declining escapement levels. Available data on spawning escapements and subsequent recruitment were analyzed using a Ricker model under various assumptions about fishery interception rates to derive maximum sustainable yield (MSY) escapement levels. A key feature of this analysis was the use of a test fishing index, collected in a consistent manner since 1956, to derive the escapement to the river-mouth, rather than the usual visual observations made on the spawning grounds. The major weakness of the analysis was the number of assumptions that had to be made about the catch distribution of the stock. An escapement level of 33,000 spawners is recommended to achieve MSY. Recent estimates of spawning escapement levels (1985 to 1987) are only 61 percent of the MSY level. Previous stock concerns appear to be valid and extremely serious. Recommendations for future research and stock monitoring are also made"--Abstract, page iii. Includes abstracts in English and French. Coho salmon British Columbia Skeena River. Fish stock assessment British Columbia Skeena River. Escapement (Fisheries) British Columbia Skeena River. Saumon coho Colombie-Britannique Skeena, Fleuve. Ressources halieutiques Évaluation Colombie-Britannique Skeena, Fleuve. Échappée (Pêches) Colombie-Britannique Skeena, Fleuve. Canada. Department of Fisheries and Oceans, issuing body. Pacific Biological Station (1972- ), issuing body. Canadian technical report of fisheries and aquatic sciences ; no. 1638. (CaOODSP)9.504449 PDF 422 KB https://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-6/Fs97-6-1638-eng.pdf