Download or read book Yukon River Chinook Salmon Aging Consistency written by Larry DuBois and published by . This book was released on 2010 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurate and consistent age estimation is an inherent assumption of historical age trend analysis. During the years that the Alaska Department of Fish and Game (ADF&G) has collected scales from Yukon River Chinook salmon Oncorhynchus tshawytscha many different readers have interpreted scale growth patterns and assigned ages. This study assessed the percent agreement and temporal consistency by ADF&G in estimating Chinook salmon ages from scales.
Download or read book Chinook Salmon Age Sex and Length Analysis from Selected Escapement Projects on the Yukon River written by Karen Hyer and published by . This book was released on 2005 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anecdotal information from fishers along the Yukon River suggests that the length of chinook salmon harvested and the proportion of female Chinook salmon in the run have decreased over time. To determine whether sex composition, size, age, and size-at-age of chinook salmon in spawning escapements have experienced a basin-wide decline over time, we examined escapement data from the Andreafsky, Anvik, Gisasa, Salcha, Chena, and Big Salmon Rivers. The scope of the analysis is limited to a relatively small number of spawning tributaries over a relatively short time period during which both fisheries and environmental changes have occurred confounding the ability to establish the sources of the decreasing size trend in Yukon River Chinook salmon.
Download or read book Estimation of U S Canada Border Age composition of Yukon River Chinook Salmon 1982 2006 written by Toshihide Hamazaki and published by . This book was released on 2018 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study estimated age and sex composition of Canadian-origin Yukon River Chinook salmon at the United States (U.S.)-Canada border from 1982 to 2006. In 2012, the Joint Technical Committee of the Yukon River Panel (JTC) adopted a change to the assessment methods used to estimate U.S.-Canada border passage of Canadian-origin Chinook salmon from a fish wheel mark-recapture operated by Fisheries and Oceans Canada (DFO) to a sonar with a gillnet test fishery at Eagle operated jointly by the Alaska Department of Fish and Game (ADF&G) and DFO since 2005. Because the 2 fish capturing methodologies (fish wheel versus gillnet) resulted in different age-sex compositions, it was necessary to adjust the age-sex composition assessed by the fish wheel to those of the gillnet test fishery. Age, sex, and length (ASL) data were collected from fish sampled using both methods from 2005 to 2012, except 2009. Using 2007, 2008, 2010-2012 data, fish wheel age-sex compositions were adjusted using 2 methods: (1) age-sex selectivity and (2) length selectivity, and compared to the age-sex compositions observed in the gillnet test fishery. Although both methods performed similarly, the age-sex selectivity method was slightly better than the length selectivity method to adjust age-sex composition. However, because of uncertainties about the 2007-2012 data representing historical fish wheel data, the length selectivity method was chosen to adjust the 1982-2006 age-sex composition. Length selectivity converted 1982-2006 age-sex proportion are presented, and the uncertainties and limitations are discussed.
Download or read book Salmon Age and Sex Composition and Mean Lengths for the Yukon River Area 2014 written by Shane M. Eaton and published by . This book was released on 2016 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biological data were collected from Chinook (Oncorhynchus tshawytscha), summer chum (O. keta), fall chum (O. keta), and coho (O. kisutch) salmon at 19 locations along the U.S. portion of the Yukon River drainage in 2014. Age, sex, and length (ASL) data were obtained from 2,969 Chinook, 4,637 summer chum, 3,120 fall chum, and 1,654 coho salmon from commercial and subsistence harvests, as well as test fisheries and escapement projects. Samples were collected from salmon caught with gillnets, dip nets, fish wheels, beach seines, weir traps, and from hand-picked carcass. Where available, escapement estimates from weir projects were separated into temporal segments (strata) and commercial harvests were separated by fishing periods. The ASL data collected during the corresponding stratum or period was applied to the corresponding escapement estimate or commercial harvest to generate estimates of proportions and numbers by age and sex. At test fishery projects ASL data were stratified into quartiles based on catch per unit effort (CPUE), commercial period, or mesh size. In 2014, age-1.3 Chinook salmon predominated from all of the test fishery and escapement projects; and most of the subsistence harvest samples. At many long standing projects 5-year-old (age-1.3 and age-2.2) Chinook salmon percentages were above the long-term and 5-year averages, whereas the 4-year-old (age-1.2 and age-2.1) and 6-year-old (age-1.4 and age-2.3) percentages were near or below the long-term and 5-year averages. Both summer and fall chum salmon samples were primarily composed of age-0.3 and age-0.4 fish. Age-2.1 coho salmon predominated in the commercial and test fishery samples.
Download or read book Growth and Degree of Maturity of Chinook Salmon in the Ocean written by Willis Horton Rich and published by . This book was released on 1925 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Age Sex and Length for Chinook and Summer Chum Salmon Within the Yukon Area 2018 written by Sean D. Larson and published by . This book was released on 2020 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biological data were collected from Chinook Oncorhynchus tshawytscha and summer chum O. keta salmon along the United States portion of the Yukon River drainage in 2018. Age, sex, and length data were obtained from 4,774 Chinook and 5,907 summer chum salmon from commercial and subsistence harvests, test fisheries, and escapement projects. Samples were collected from salmon caught using gillnets, dip nets, fish wheels, beach seines, weir traps, and from hand-picked carcasses. Sex and length were recorded for nearly all salmon sampled. Ages were successfully estimated for 89% of the Chinook salmon and 93% of the summer chum salmon. This report provides a summary of the age, sex, and length data collected in 2018 for Chinook and summer chum salmon and is a single source document for historical summaries of long-term projects that collect age, sex, and length data from the Yukon Area. This report also provides a brief description of the Arctic-Yukon-Kuskokwim Database Management System (AYKDBMS) which is a publicly accessible online data archiving system that acts as an interface to query and download historical age, sex, and length data.
Download or read book Origins of Chinook Salmon in the Yukon River Fisheries 2013 written by Larry DuBois and published by . This book was released on 2016 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The stock and age composition of Chinook salmon Oncorhynchus tshawytscha harvest within the Yukon River drainage was estimated for 2013. Stock composition was estimated by genetic analysis for 3 geographically-based stock groups termed Lower, Middle, and Upper. Stock composition estimates from sampled fish were applied to specific harvests across all age classes. Ages of sampled fish were determined from scales; age composition was estimated from the sample proportions in each age class. Age composition estimates were applied to specific harvests across all stock groups. The total estimated Yukon River harvest in 2013 was 13,345 Chinook salmon; of these 13.4% were estimated to be of Lower, 21.0% Middle, and 65.6% Upper stock group origin. On average over all harvests, age-1.4 fish dominated the harvest at 44.5%, age-1.3 fish were 37.2%, age-1.2 fish were 15.3%, and other age classes combined were 3.0% of the total.
Download or read book Length girth Length weight and Fecundity of Yukon River Chinook Salmon Oncorhynchus Tshawytscha written by James R. Jasper and published by . This book was released on 2006 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report discusses morphometric data, including length, girth, and weight measurements, that were obtained along with age and sex data from Yukon River chinook salmon, Oncorhynchus tshawytscha, caught in the test fisheries of the ADF & G sonar projects located near the villages of Pilot Station and Eagle in 2005.
Download or read book Informational Leaflet written by and published by . This book was released on 1984 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Origins of Chinook Salmon in the Yukon River Fisheries 2007 written by Larry DuBois and published by . This book was released on 2011 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports on estimations of the stock and age composition of all harvests of Chinook salmon, Oncorhynchus tshawytscha, within the Yukon River drainage in 2007. Also includes historical data from 1981-2007.
Download or read book Bering Sea Chinook Salmon Bycatch Management Regulatory Impact Review initial Regulatory Flexibility Analysis written by and published by . This book was released on 2009 with total page 842 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Yukon River Salmon Age Sex and Length Database Error Checking and Finalization written by Holly A. Krenz and published by . This book was released on 2006 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Origins of Chinook Salmon in the Yukon River Fisheries 2012 written by Larry DuBois and published by . This book was released on 2015 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this project are to estimate the total Yukon River Chinook salmon harvest by 1) broad-scale stock grup and 2) age class, during the 2012 season.
Download or read book Origins of Chinook Salmon in the Yukon River Fisheries 2008 written by Heather Leba and published by . This book was released on 2011 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports on estimations of the stock composition of all harvests and test fishery catches of Chinook salmon, Oncorhynchus tshawytscha, within the Yukon River drainage in 2008. Stock composition was estimated for 3 geographically-based stock groups termed Lower, Middle, and Upper, and commercial and subsistence harvest age compositions were estimated from aged scales collected. Age compositions from sampled fish, in combination with genetic stock estimates, were used to estimate the stock composition for each age class. Also includes historical data from 1981-2008.
Download or read book Origins of Chinook Salmon in the Yukon River Fisheries 2009 written by Larry DuBois and published by . This book was released on 2013 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports on estimations of the stock composition of all harvests and test fishery catches of Chinook salmon, Oncorhynchus tshawytscha, within the Yukon River drainage in 2009. Stock composition was estimated for 3 geographically-based stock groups termed Lower, Middle, and Upper, and commercial and subsistence harvest age compositions were estimated from aged scales collected. Age compositions from sampled fish, in combination with genetic stock estimates, were used to estimate the stock composition for each age class. Also includes historical data from 1981-2008.
Download or read book Origins of Chinook Salmon in the Yukon River Fisheries 2011 written by Larry DuBois and published by . This book was released on 2015 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this project are to estimate the total Yukon River Chinook salmon harvest by 1) broad-scale stock grup and 2) age class, during the 2011 season.
Download or read book Salmon Age and Sex Composition and Mean Lengths for the Yukon River Area 2012 written by Kyle Schumann and published by . This book was released on 2014 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report discusses biological data collected from Chinook Oncorhynchus tshawytscha, summer chum O. keta, fall chum O. keta, and coho salmon O. kisutch at 34 locations along the U.S. portion of the Yukon River drainage in 2012.
