Download or read book Estimation of Chum Salmon Abundance and Spawning Distribution in the Fish River Complex 2002 written by Gary L. Todd and published by . This book was released on 2004 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Chum salmon were seined in the lower Fish River for biological sampling and 100 radio tags were deployed. Mark-recapture methodology, using Niukluk River counting tower as recapture location was used to estimate total chum salmon abundance in the Fish River"--P. vi.
Download or read book Estimation of Chum Salmon Abundance Migration Timing and Spawning Distribution in the Fish River Complex Norton Sound Alaska 2002 2004 written by Gary L. Todd and published by . This book was released on 2005 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimation of Abundance and Distribution of Chum Salmon in the Unalakleet River Drainage 2004 written by Jeffrey L. Estensen and published by . This book was released on 2005 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimation of Chinook Salmon Abundance and Spawning Distribution in the Unalakleet River 2010 written by Philip John Joy and published by . This book was released on 2014 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimation of Chinook Salmon Abundance and Spawning Distribution in the Unalakleet River 2009 written by Philip John Joy and published by . This book was released on 2014 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abundance Distribution and Migration Patterns of Summer Chum Salmon in the Yukon River Drainage 2014 2015 written by Sean Larson and published by . This book was released on 2017 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summer chum salmon (Oncorhynchus keta) in the Yukon River support robust commercial and subsistence fisheries; however, fishery managers have had incomplete information about their run timing, spawning distribution, stock composition, and abundance. To address this, a radiotelemetry study was implemented on summer chum salmon in 2014 and 2015. A total of 1,232 (2014) and 1,199 (2015) summer chum salmon were fitted with radio transmitters. Radiotagged summer chum salmon were mapped, travel rates were estimated, and proportions of tagged fish recovered within different tributaries were determined. Basic mark-recapture assumptions were tested and abundance above the tagging site was estimated. Summer chum salmon were found to be widely distributed within the Yukon River drainage. Although a few tagged fish were observed in most locations, roughly 50% of tagged fish were observed in the Anvik, Koyukuk, and Bonasila rivers each year. Summer chum salmon destined for upper river spawning areas traveled faster than those to lower river areas. Summer chum salmon tended to recover quickly after being tagged, and traveled relatively fast within the mainstem Yukon River, but slowed down after entering their spawning tributaries. The 2014 mark-recapture abundance estimate was about 2,100,000 fish, which corresponded with summer chum salmon passage at the mainstem Yukon River sonar near Pilot Station. The 2015 mark-recapture abundance estimate was also about 2,100,000 fish, which was larger than the summer chum salmon passage at the sonar near Pilot Station. Results from this study help to evaluate sonar passage estimates and provide fishery managers with more detailed information about distribution and migratory patterns of individual summer chum salmon stocks within the Yukon River drainagewide population.
Download or read book Abundance and Spawning Distribution of Susitna River Chum Onchorhynchus Keta and Coho O Kisutch Salmon 2012 written by Peter Mallon Cleary and published by . This book was released on 2016 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2009, the Alaska Department of Fish and Game began a 4-year spawning distribution and abundance estimation study in response to concerns over the status of the Susitna River chum (Oncorhynchus keta) and coho (O. kisutch) salmon stocks. This report summarizes results of mark-recapture abundance and distribution assessments completed during 2012. Four fish wheels were used at river mile (RM) 22 in the Susitna River to capture and tag chum and coho salmon with dart tags in July and August 2012. Two fish wheels were used at RM 6 in the Yentna River and 2 fish wheels were used at RM 34 in the mainstem Susitna River to sample salmon for tags. Estimated spawning abundance of chum salmon was 229,903 (SE 155,193) fish for the mainstem Susitna River and 99,442 (SE 84,876) fish for the Yentna River. Estimated spawning abundance of coho salmon was 90,397 (SE 36,701) fish for the mainstem Susitna River and 93,919 (SE 10,688) fish for the Yentna River. A total of 799 radio tags were placed in chum and coho salmon. Their movements were tracked using 10 ground tracking stations, 15 aerial surveys of the mainstem Susitna River, 6 aerial surveys of the Yentna River, and 2 drainagewide aerial surveys. All but 50 of the radio tags were relocated, and 716 (89.6%) were assigned a putative spawning location. Both chum and coho salmon exhibited bank orientation at the tagging site.
Download or read book Abundance and Spawning Distribution of Susitna River Chum Oncorhynchus Keta and Coho O Kisutch Salmon 2011 written by Peter Mallon Cleary and published by . This book was released on 2016 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2009, the Alaska Department of Fish and Game began a 4-year spawning distribution and abundance estimation study in response to concerns over the status of the Susitna River chum (Oncorhynchus keta) and coho (O. kisutch) salmon stocks. This report summarizes results of mark-recapture abundance and distribution assessments completed during 2011. Four fish wheels were used to capture and tag chum and coho salmon with dart tags at river mile (RM) 22 in the Susitna River in July and August 2011. Two fish wheels were used at RM 7 in the Yentna River and 2 fish wheels were used at RM 34 in the mainstem Susitna River to sample salmon for tags. Estimated abundance of chum salmon was 1,473,969 (SE 123,933) fish for the mainstem Susitna River and 278,063 (SE 42,780) fish for the Yentna River. Estimated abundance of coho salmon was 131,878 (SE 24,146) fish for the mainstem Susitna River and 84,677 (SE 9,981) fish for the Yentna River. A total of 734 radio tags were placed in chum and coho salmon. Their movements were tracked using 6 ground tracking stations, 7 aerial surveys of the mainstem Susitna River, 6 aerial surveys of the Yentna River, and 3 drainagewide aerial surveys. All but 31 of the radio tags were relocated and 635 (86.5%) were assigned a putative spawning location. Both chum and coho salmon exhibited bank orientation at the tagging site.
Download or read book Spawning Abundance of Chinook Salmon in the Taku River in 2003 written by and published by . This book was released on 2006 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: A cooperative study involving the Department of Fisheries and Oceans Canada, the Alaska Department of Fish and Game, and the Taku River Tlingit First Nation was conducted to estimate the number of spawning Chinook salmon Oncorhynchus tshawytscha in the Taku River in 2003 with a mark-recapture experiment. Fish were captured at Canyon Island on the lower Taku River with fish wheels from May through August and were individually marked with back-sewn, solid-core spaghetti tags. All tagged fish were also batch marked with an opercle punch plus removal of the left axillary appendage. Sampling on the spawning grounds in tributaries was used to estimate the fraction of the population that had been marked. The estimated spawning abundance of small Chinook salmon ( 400 mm long; mid-eye to fork of tail) was 3,489 (SE = 1,052). Spawning abundance of medium-size Chinook salmon (401-659 mm) was estimated to be 16,780 (SE = 2,274). Finally, spawning abundance of large-size fish (= 660 mm) was estimated to be 36,435 (SE = 6,705), and the estimated total of all fish was 56,704 (SE = 7,158). The sum of the peak aerial survey counts of large spawning Chinook salmon conducted at five index tributaries of the Taku River was 16% of the mark-recapture estimate. Age 1.3 fish (1998 brood year) constituted an estimated 40% of the spawning population, followed by age 1.2 fish (1999 brood year), which constituted an estimated 29% of the population
Download or read book Estimation of Abundance and Distribution of Chum Salmon Oncorhynchus Keta in the Unalakleet River Drainage 2005 written by Jeffrey L. Estensen and published by . This book was released on 2007 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document reports on the second of a 3-year project using radiotelemetry mark and recapture methods to determine the proportion of chum salmon, Oncorhynchus keta, migrating into North River and above a proposed weir site on Unalakleet River, and to estimate total Unalakleet drainage abundance.
Download or read book Re introduction of Lower Columbia River Chum Salmon Into Duncan Creek written by Todd Hillson and published by . This book was released on 2002 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abundance and Spawning Distribution of Susitna River Chum Oncorhynchus Keta and Coho O Kisutch Salmon 2010 written by Peter Mallon Cleary and published by . This book was released on 2013 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Estimates for Chum Salmon Spawning in the Mainstem Columbia River 2002 written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurate and precise population estimates of chum salmon (Oncorhynchus keta) spawning in the mainstem Columbia River are needed to provide a basis for informed water allocation decisions, to determine the status of chum salmon listed under the Endangered Species Act, and to evaluate the contribution of the Duncan Creek re-introduction program to mainstem spawners. Currently, mark-recapture experiments using the Jolly-Seber model provide the only framework for this type of estimation. In 2002, a study was initiated to estimate mainstem Columbia River chum salmon populations using seining data collected while capturing broodstock as part of the Duncan Creek re-introduction. The five assumptions of the Jolly-Seber model were examined using hypothesis testing within a statistical framework, including goodness of fit tests and secondary experiments. We used POPAN 6, an integrated computer system for the analysis of capture-recapture data, to obtain maximum likelihood estimates of standard model parameters, derived estimates, and their precision. A more parsimonious final model was selected using Akaike Information Criteria. Final chum salmon escapement estimates and (standard error) from seining data for the Ives Island, Multnomah, and I-205 sites are 3,179 (150), 1,269 (216), and 3,468 (180), respectively. The Ives Island estimate is likely lower than the total escapement because only the largest two of four spawning sites were sampled. The accuracy and precision of these estimates would improve if seining was conducted twice per week instead of weekly, and by incorporating carcass recoveries into the analysis. Population estimates derived from seining mark-recapture data were compared to those obtained using the current mainstem Columbia River salmon escapement methodologies. The Jolly-Seber population estimate from carcass tagging in the Ives Island area was 4,232 adults with a standard error of 79. This population estimate appears reasonable and precise but batch marks and lack of secondary studies made it difficult to test Jolly-Seber assumptions, necessary for unbiased estimates. We recommend that individual tags be applied to carcasses to provide a statistical basis for goodness of fit tests and ultimately model selection. Secondary or double marks should be applied to assess tag loss and male and female chum salmon carcasses should be enumerated separately. Carcass tagging population estimates at the two other sites were biased low due to limited sampling. The Area-Under-the-Curve escapement estimates at all three sites were 36% to 76% of Jolly-Seber estimates. Area-Under-the Curve estimates are likely biased low because previous assumptions that observer efficiency is 100% and residence time is 10 days proved incorrect. If managers continue to rely on Area-Under-the-Curve to estimate mainstem Columbia River spawners, a methodology is provided to develop annual estimates of observer efficiency and residence time, and to incorporate uncertainty into the Area-Under-the-Curve escapement estimate.
Download or read book Abundance and Run Timing of Adult Salmon in Henshaw Creek Kanuti National Wildlife Refuge Alaska 2002 written by Gareth K. VanHatten and published by . This book was released on 2003 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports run size, timing, age, sex ratios, and length distributions for chinook and summer chum salmon spawning populations within the Henshaw Creek drainage, a tributary of the Koyukuk River.
Download or read book Lower Columbia River Juvenile Chum Salmon Monitoring written by and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: For the past 5 to 15 years, WDFW has operated juvenile monitoring traps at five separate locations: Grays River mainstem, Crazy Johnson Creek (Grays River basin), Duncan Creek spawning channel, Hamilton Creek mainstem, and Hamilton Springs spawning channel (Hamilton Creek basin). Juvenile data were collected with either a rotary screw trap (RST) or fence-panel weir. Trap sites were generally operated from late-winter and early-spring (February to March) through late spring to mid-summer (May to August). Although a portion of the collected data have previously been analyzed (i.e., chum salmon fry abundances from Duncan Creek and Hamilton Springs spawning channels), the majority had not. Therefore, the purpose of this report was to summarize the juvenile chum salmon monitoring activities in lower Columbia River since 2002, with specific focus on the generation of annual abundance estimates of juvenile outmigrants. While the emphasis of the juvenile monitoring outlined in this report was to generate unbiased and precise outmigrant estimates for chum salmon, data were collected on all species encountered. Thus, when data were available, outmigrant estimates were generated for other species, including Chinook salmon (O. tshawytscha), coho salmon (O. kisutch), and steelhead (O. mykiss). Abundance estimates were stratified by site, year, species, origin (natural and hatchery), life-stage (fry, parr, and transitional/smolt), and age-class (sub yearling and yearling). Across all five monitoring sites, we monitored a total of 35 outmigrant years and generated a total of 117 outmigrant abundance estimates and their associated levels of precision.
Download or read book Nulato River Salmon Escapement Project 2002 written by Tracy L. Lingnau and published by . This book was released on 2002 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Chinook and summer chum salmon migrating into the Nulato River were counted using counting towers to estimate the spawning abundance in 2002"--Abstract.
Download or read book Susitna River Chinook Salmon Abundance and Distribution 2018 2020 written by Nicholas A. Decovich and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adult Chinook salmon abundance and distribution were estimated for the Susitna River drainage in 2018–2020 for the 6th through 8th consecutive years. Abundance estimates for the mainstem Susitna River above river mile (RM) 34 were produced using mark–recapture techniques to deploy tags on fish caught via fish wheel and gillnet at a site in the lower river (RM 34) and recover tags using a passive integrated transponder (PIT) tag detection system at the Deshka River weir site. Spawning distribution was assessed with radiotelemetry for 2019 and 2020 only. Fish were radiotagged at the lower river tag deployment site and tracked along their spawning migration with an array of fixed-antenna tracking stations. Upstream movement of each tag was categorized into 1 of 5 stocks: Chulitna River, upper Susitna River (RM 102.4–153.4), Deshka River, Eastside Susitna River, or Talkeetna River. The estimated mainstem Susitna River abundance at RM 34 (and 95% confidence intervals) of Chinook salmon ≥500 mm mid eye to tail fork (METF) length for 2018, 2019, and 2020 were 30,605 (23,262–40,396), 57,927 (42,843–78,118), and 62,346 (45,245–87,888), respectively. For 2018–2019, the abundance estimated for Chinook salmon in the Eastside Susitna River group was 14,121 (SE = 3,473) and 21,933 (SE = 5,107) fish, respectively, and accounted for the largest proportions (24% and 35%, respectively) of the mainstem Susitna River estimate.
