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Book Supplement to the Pre season Return Forecasts for Fraser River Sockeye Salmon in 2015

Download or read book Supplement to the Pre season Return Forecasts for Fraser River Sockeye Salmon in 2015 written by and published by . This book was released on 2015 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: To provide context for the 2015 forecast (DFO 2015), this year's Fraser Sockeye forecast supplement report focuses specifically on the 2011 brood year for lake-type stocks, and the 2011 and 2012 brood years for river-type stocks (i.e. Harrison Sockeye). This report synthesizes information on the adult migration conditions, escapement and spawner success, fry and their lake rearing conditions, smolt and juvenile migration, and ocean conditions. In addition, stock compositions of the 2011 escapements, 2013 downstream smolt migration, juvenile ocean migration, and 2015 return forecasts are compared to evaluate proportional changes in stock composition through time. The 2014 forecast supplement report (DFO 2014b) can be used, in combination with this report, to provide context for the five year olds returning in 2015 (DFO 2015).

Book Supplement to the Pre season Run Size Forecasts for Fraser River Sockeye Oncorhynchus Nerka Salmon in 2016

Download or read book Supplement to the Pre season Run Size Forecasts for Fraser River Sockeye Oncorhynchus Nerka Salmon in 2016 written by Canadian Science Advisory Secretariat and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Pre season Run Size Forecasts for Fraser River Sockeye Oncorhynchus Nerka and Pink O Gorbuscha Salmon in 2015

Download or read book Pre season Run Size Forecasts for Fraser River Sockeye Oncorhynchus Nerka and Pink O Gorbuscha Salmon in 2015 written by and published by . This book was released on 2015 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pre-season run size forecasts of returning Fraser River adult Sockeye and Pink Salmon in 2015 were requested by Fisheries and Oceans Canada (DFO) Fisheries Management. Forecasts are used for pre-season planning purposes and for in-season management. They are most useful early in each stock-group's return migration, before in-season test fisheries are able to provide reliable in-season run size estimates. Forecasts are produced by DFO as stipulated in Annex IV, Chapter 4 of the Pacific Salmon Treaty and are presented by stock and run timing group. This Science Response Report results from the Science Response Process of November 25, 2014 on the Pre-season abundance forecasts for Fraser River Sockeye and Pink Salmon returns in 2015. The 2015 forecast relies on methods of past CSAS processes and publications (Cass et al. 2006; DFO 2006, 2009, 2011, 2012, 2013a, 2014a, 2014b; Grant & MacDonald 2013; MacDonald & Grant 2012).

Book Pre season Run Size Forecasts for Fraser River Sockeye Oncorhynchus Nerka Salmon in 2016

Download or read book Pre season Run Size Forecasts for Fraser River Sockeye Oncorhynchus Nerka Salmon in 2016 written by and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chilko marine survival, similar to the total Fraser Sockeye survival trend, declined in the 1990's and culminated in the lowest survival on record in the 2009 return year. [...] Analysis and Response Data Fraser Sockeye stock-recruitment data used in the forecast process includes the following: • The last brood year for which full recruitment data (four and five year olds) are available for the 2016 forecast is 2009, with the exception of Harrison Sockeye (three and four year olds) where data are included to the 2010 brood year. [...] Five year old forecasts derived from the sibling model were used for the following stocks and the rationales for using the sibling model are described below: 6 Pacific Region Pre-Season Run Size for Fraser River Sockeye Salmon 2016 • Weaver: a high proportion of five year olds in the original selected model forecast (93%) due to the very low brood year escapement in 2012 (400 EFS), exceptionally l [...] However, if the Larkin model had been used for these stocks in 2015, instead of the Ricker model, then the returns (which were comprised of ~75% four year olds) would have fallen closer to the mid-point of the forecast distribution. [...] Given the exceptional brood year escapement in 2010, the improved performance (return minus forecast) of the Larkin model to predict four year old recruits from the 2011 brood year that returned in 2015, indicates the possibility that these stocks experienced delayed-density dependent survival in the 2011 brood year.

Book Pre season Run Size Forecasts for Fraser River Sockeye Oncorhynchus Nerka Salmon in 2018

Download or read book Pre season Run Size Forecasts for Fraser River Sockeye Oncorhynchus Nerka Salmon in 2018 written by Canadian Science Advisory Secretariat and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Pre season Run Size Forecasts for Fraser River Sockeye Oncorhynchus Nerka Salmon in 2020

Download or read book Pre season Run Size Forecasts for Fraser River Sockeye Oncorhynchus Nerka Salmon in 2020 written by Mike Hawkshaw and published by . This book was released on 2020 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: