Proceedings of the Pacific Regional Peer Review on An Evaluation of West Coast Vancouver Island Chinook Salmon Visual Spawning Escapement Estimation Methods PDF Download
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Author: Lesley MacDougall
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Languages : en
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Author: Lesley MacDougall
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Category :
Languages : en
Pages :
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Category : Chinook salmon
Languages : en
Pages : 7
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Category :
Languages : en
Pages : 0
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The Chair discussed the ground rules for the meeting, the role of participants, the purpose of the various RPR publications that will result from this process (a Research Document and Proceedings), and the definition and process around achieving consensus. [...] The Chair reviewed the Terms of Reference (TOR) (Appendix A) for the meeting, outlining the standard objective of a pre-COSEWIC review by DFO, and the specific objectives of the meeting. [...] The authors second criteria for infilling, where data is not infilled if the gap is greater than the average age of fish, could affect the sensitivity of results, therefore different lengths of gaps that can be filled should be included in the sensitivity analysis. [...] DAVID O'BRIEN The reviewer concurred with the previous review and also praised the authors for the amount of work done, and especially appreciated the sensitivity analysis described at the meeting. [...] In order to operationalize something that recognizes the spirit of the WSP, the authors made available the magnitude of enhancement for each CU (Appendices C and D in the working paper).
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Languages : en
Pages :
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Author: Canada. Department of Fisheries and Oceans
Publisher: Nanaimo, B.C. : Fisheries and Oceans, Canada
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Languages : en
Pages : 49
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Author: C. J. Perrin
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Category :
Languages : en
Pages : 49
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Escapement estimates provide a basis for setting exploitation rates and for assessing the effect of exploitation or habitat manipulation on stocks, as well as for comparing and contrasting management policies using stock-recruitment relationships. Several methods are available to estimate escapement, but for any one spawning run they can field widely different results. This report reviews estimates of `survey life' (SL) (the number of days that mature salmon are alive in a survey area) for Pacific salmon. SL is an important parameter in the area-under-the-curve (AUC) method often used to estimate the spawning escapement of Pacific salmon. The report assembles data from many sources to determine if variation in SL measurements collected for the 5 species of Pacific salmon found in B.C. can be explained by biological and environmental variables. The study determined if extrapolation of SL estimates among streams and years is valid when the AUC method is used to estimate escapement.
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Languages : en
Pages : 0
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The Chair discussed the role of participants, the purpose of the various publications that will result from this process (Proceedings and a Research Document), and reviewed the definition and process around achieving consensus decisions and advice. [...] Everyone was invited to participate fully in the discussion and to contribute knowledge to the process, with the goal of delivering scientifically defensible conclusions and advice. [...] The Chair reviewed the Agenda (Appendix C) and the Terms of Reference for the meeting, highlighting the objectives and identifying the Rapporteurs for the meeting. [...] If the species is already on Schedule 1 of SARA, the Minister may decide to keep the species on the list, reclassify it as per the COSEWIC assessment, or to remove it from the list (Section 27 of SARA). [...] Fisheries and Oceans Canada (DFO), as a generator and archivist of information on marine species and some freshwater species, is to provide COSEWIC with the best information available to ensure that an accurate assessment of the status of a species can be undertaken.
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Category : Fishery management
Languages : en
Pages : 118
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Author: Cornelis Groot
Publisher: UBC Press
ISBN: 9780774803595
Category : Nature
Languages : en
Pages : 602
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Pacific salmon are an important biological and economic resource of countries of the North Pacific rim. They are also a unique group of fish possessing unusually complex life histories. There are seven species of Pacific salmon, five occurring on both the North American and Asian continents (sockeye, pink, chum, chinook, and coho) and two (masu and amago) only in Asia. The life cycle of the Pacific salmon begins in the autumn when the adult female deposits eggs that are fertilized in gravel beds in rivers or lakes. The young emerge from the gravel the following spring and will either migrate immediately to salt water or spend one or more years in a river or lake before migrating. Migrations in the ocean are extensive during the feeding and growing phase, covering thousands of kilometres. After one or more years the maturing adults find their way back to their home river, returning to their ancestral breeding grounds to spawn. They die after spawning and the eggs in the gravel signify a new cycle. Upon this theme Pacific salmon have developed many variations, both between as well as within species. Pacific Salmon Life Histories provides detailed descriptions of the different life phases through which each of the seven species passes. Each chapter is written by a scientist who has spent years studying and observing a particular species of salmon. Some of the topics covered are geographic distribution, transplants, freshwater life, ocean life, development, growth, feeding, diet, migration, and spawning behaviour. The text is richly supplemented by numerous maps, illustrations, colour plates, and tables and there is a detailed general index, as well as a useful geographical index.
![An Investigation Into the Factors Influencing Escapement Estimation for Chinook Salmon (Oncorhynchus Tshawytscha) on the Lower Shuswap River, British Columbia [microform] PDF](https://books.google.com/books/content/images/frontcover/5NQBywEACAAJ?fife=w80-h100)
Author: Nicole Dorothy Trouton
Publisher: Library and Archives Canada = Bibliothèque et Archives Canada
ISBN: 9780494036549
Category : Chinook salmon
Languages : en
Pages : 214
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The area-under-the-curve (AUC), method based on helicopter visual enumeration, is a commonly used technique to estimate escapement of chinook salmon (Oncorhynchus tshawytscha) for the Fraser River and its tributaries. Two key factors associated with this method are survey life and observer efficiency. The survey life currently assumed by Fisheries and Oceans Canada (DFO) for Thompson Basin streams is seven days and for most counting flights the assumed observer efficiency is 100%. Telemetry and tower observations were used to estimate annual (2000-2002) survey lives for male (telemetry) and female (telemetry and tower observation) chinook salmon in the Lower Shuswap River. Mark-recapture based survey lives were directly estimated by dividing the mark-recapture escapement estimate by the AUC estimate of total spawner days. Observer efficiency was estimated by comparing observer counts from helicopters to counts from photographs. Various combinations of total fish counts, observer efficiencies, and survey lives were used in AUC escapement estimates, and compared to mark-recapture and peak count estimates. Survey lives varied annually. Many of the estimated mean survey lives were significantly less than seven days; mark-recapture based survey lives were generally less than those estimated from telemetry and observations from towers; and mean survey lives for males were higher than for females. The mean observer efficiency of helicopter enumeration was 97% (95% CI is * 6%), this is not significantly different than the 100% assumed by DFO.
