Download or read book Anchor River Chinook Salmon Stock Assessment 2013 written by Carol M. Kerkvliet 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 Operational Plan written by Holly I. Dickson and published by . This book was released on 2020 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2020-2024, Chinook salmon (Oncorhynchus tshawytscha) will be enumerated at 2 Anchor River sites from mid-May through early August to monitor escapement for the drainage. The south fork site, located at approximately river kilometer (RKM) 4.0, will be monitored by an Adaptive Resolution Imaging Sonar (ARIS) during high flow periods, and a resistance board weir fitted with underwater video will be used thereafter. The north fork site, located at about RKM 5.3, will be monitored by a resistance board weir with underwater video from the beginning of the Chinook salmon run in early May. Motion-detection technology will be used at each weir to record fish passage 24 hours per day. Weekly beach seine surveys will be used to capture Chinook salmon for age-sex-length (ASL) samples downstream of the confluence of the south and north forks. Chinook salmon data will be used to update estimates of the spawner-recruit relationship and harvest rate, and to provide inseason run information to managers. Coho salmon and steelhead will also be monitored in the fall of each year using the resistance board weir and video system on each fork. Coho salmon age, sex, and length will be collected via beach seining. Coho salmon escapement and harvest rate will be estimated along with an index of steelhead abundance and catch rate.

Download or read book Chinook Salmon Stock Assessment and Research Plan 2013 written by Alaska. Division of Sport Fish and published by . This book was released on 2013 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent Alaska-wide downturns in productivity and abundance of Chinook salmon stocks have created social and economic hardships across many communities in rural and urban Alaska. There is a fundamental need to more precisely characterize productivity and abundance trends of Chinook salmon stocks across Alaska, gather essential information necessary to understand root causes of these widespread declines, and track population trends into the future. This document outlines a foundation of stock assessment and research programs among a suite of indicator stocks across Alaska designed as a long-term commitment to address fundamental knowledge gaps, elucidate causal mechanisms behind observed trends, and improve management capabilities. A team of nine Alaska Department of Fish and Game biologists and scientists worked collaboratively with federal agencies and academic partners to develop this plan to guide efforts towards better understanding productivity and abundance trends of Chinook salmon. In this plan we describe the general life history of Chinook salmon in Alaska; document stock-specific declines in productivity, abundance, and harvest that have occurred; and, described gaps in knowledge that limit management options when responding to downturns in productivity. The core of this proposed plan is a stock-specific, life history-based approach to research focused on twelve indicator stocks from around Alaska, representing diverse life history and migratory characteristics across a broad geographic range. Stock assessment programs on indicator stocks target specific objectives so that gaps in our knowledge of Chinook salmon can be addressed in a practical, cost-effective, and structured approach. The twelve indicator stocks, from Southeast Alaska to the Arctic-Yukon-Kuskokwim are: Unuk, Stikine, Taku, Chilkat, Copper, Susitna, Kenai, Karluk, Chignik, Nushagak, Kuskokwim, and Yukon rivers. Recommended stock assessments include enumeration of adult escapement and stock-specific harvests in all relevant fisheries, as well as estimates of juvenile Chinook salmon abundance during the smolt stage (Table 1 and Table 2). As a companion to these stock-specific and fishery-based projects, we also recommend a suite of local and traditional knowledge studies (Table 2), nearshore marine surveys, and life history process studies (Table 3). Approximate annual costs by type of activity are shown in Table 4. This plan represents a long-term effort where implementation of stock assessment programs on indicator stocks addresses critical knowledge gaps that limit management capabilities. Implementation to the fullest extent possible provides most opportunity for improved information to assist managers, particularly during times of low abundance.

Download or read book Relation of Scale Characteristics to River of Origin in Four Stocks of Chinook Salmon oncorhynchus Tshawytscha in Alaska written by Richard G. Rowland and published by . This book was released on 1969 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stock Status and Recommended Escapement Goal for Anchor River Chinook Salmon written by Nicole J. Szarzi and published by . This book was released on 2007 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Anchor River Chinook Salmon Escapement 2013 written by Carol M. Kerkvliet and published by . This book was released on 2018 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2013 Anchor River Chinook salmon (Oncorhynchus tshawytscha) escapement (4,401 fish, SE 117) fell within the sustainable escapement goal (SEG) range of 3,800?10,000 fish. High river flows changed the channel morphology at the confluence of the north and south forks, which rendered the 2003?2012 mainstem dual-frequency identification sonar (DIDSON) site unsuitable for monitoring escapement. Thus, for the 2013 season, the DIDSON was relocated about 0.3 RKM downstream and was operated throughout the high-water period. Once flows subsided, 2 alternative escapement monitoring sites were identified upstream: 1 on the south fork and 1 on the north fork. The north fork site was located approximately 1.5 RKM upstream from the confluence and the south fork site was located approximately 0.2 RKM upstream of the confluence. Weirs and underwater video systems were used at both sites to monitor escapement. The midpoint of the Chinook salmon run was 19 June. The daily Chinook salmon escapement counts were positively correlated with daily average river stage, but not with daily average river temperature. The dominant age class was ocean age 3 (43.5%, SE 4.1%). Overall mean length of males (604 mm, SE 15) was smaller than that of females (734 mm, SE 25). The inriver sport fishery was restricted by a series of emergency orders that probably resulted in a near record low harvest of 97 fish.

Download or read book Stock Assessment of Early run Chinook Salmon in the Kenai River 2002 2006 written by Timothy R. McKinley and published by . This book was released on 2010 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stock Assessment of Chinook Sockeye and Chum Salmon in the Nushagak River written by Gregory B. Buck and published by . This book was released on 2012 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Unalakleet River Chinook Salmon Escapement Monitoring and Assessment 2013 2014 written by Scott Kent and published by . This book was released on 2016 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Declining run sizes and ensuing state and federal restrictions and closures to Unalakleet River Chinook salmon Oncorhynchus tshawytscha fisheries highlighted the need to obtain more complete estimates of spawning escapement. In response, multiple agencies and entities began the Unalakleet River weir project in 2010 funded by United States Fish and Wildlife Service's Office of Subsistence Management to obtain estimates of the mainstem Chinook salmon escapement and its age, sex, and length composition. An estimated 667 and 1,126 Chinook salmon were enumerated during the 2013 and 2014 seasons. The central 50% of the Chinook salmon run was enumerated 7 July-18 July in 2013 and could not be determined in 2014 because Chinook salmon passage was not fully evaluated. In 2013, there were 3 days of partial counts. Interpolation of missed counts could not be completed in 2014 because of incomplete information about the exact duration and extent of unmonitored periods. Age composition could not be determined from the 2013 escapement samples because the minimum sampling goal was not achieved; sex composition was 52% female. In 2014, age-1.3 Chinook salmon comprised the majority (68%) of the escapement samples.

Download or read book Anchor River Chinook Salmon Escapement 2014 written by Carol M. Kerkvliet and published by . This book was released on 2020 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2014, the Anchor River Chinook salmon (Oncorhynchus tshawytscha) escapement was fully enumerated with combined daily counts from the north and south forks of the Anchor River using weirs fitted with underwater video systems. The 2014 escapement (2,499) fell below the sustainable escapement goal (SEG) range of 3,800-10,000 Chinook salmon. It was the lowest escapement observed since Chinook salmon were first fully enumerated on the Anchor River in 2003. A series of emergency orders were issued in 2014 that restricted the inriver and nearby marine sport fisheries. The midpoint of the combined north and south fork Chinook salmon runs occurred on 15 June. No correlation was detected between daily Chinook salmon counts on the south fork and average river stage or average river temperature. Age composition was estimated from samples collected during weekly beach seining in the mainstem, downstream of the weirs. The dominant age class was ocean age 3 (40.4%; SE 3.0%). No significant differences were detected between mean lengths of ocean-age-3 males and females or between ocean-age-4 males and females. There were no significant differences between the proportion Chinook salmon ≤508 mm total length collected from beach seine samples and video weir observations. The escapement and age composition data will be used in a spawner-recruit analysis to derive appropriate escapement goals.

Download or read book Alexander Creek Chinook Salmon Stock Assessment 2016 and 2017 written by Nick Logelin and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon (Oncorhynchus tshawytscha) were enumerated in 2016 and 2017 using a resistance board weir at river kilometer 21 of Alexander Creek in the Northern Cook Inlet Management Area. A lack of funding in 2016 and 2017 lead to abbreviated field seasons that concluded on August 9 and July 25, respectively. In 2016, the total Chinook salmon escapement to Alexander Creek was 727 fish; the midpoint of the run was June 22. The dominant age classes of the 2016 Chinook salmon run were 1.3 (61.9%, SE 6.3%) and 1.2 (22.6%, SE 5.0%). In 2017, the total Chinook salmon escapement to Alexander Creek was 354 fish; the midpoint of the run was June 26. The dominant age classes of the 2017 Chinook salmon run were 1.2 (53.3%, SE 7.5%) and 1.3 (33.5%, SE 6.3%).

Download or read book Ninilchik River Chinook Salmon Stock Assessment and Supplementation 2016 2018 written by Holly I. Dickson and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: During 2016–2018, an instream video weir enumerated the entire run of Ninilchik River Chinook salmon with average wild and hatchery escapements of 1,121 and 895, respectively. Enumerating the entire run allowed ADF&G to establish a sustainable escapement goal (SEG) based on total escapement versus an SEG based on an index period from 3 to 31 July. The current SEG of 750–1,300 Chinook salmon was met during all 3 years of the study (2016–2018). The current average wild escapement was below the average from when the run was last fully enumerated (1999–2015), but above the average from when the run was expanded based on weir counts (2006–2015). In contrast, the current average hatchery escapement was above the average from 1999–2015. Age-sex-length compositions were assessed during broodstock collection in 2016–2018. Wild Chinook salmon were predominantly ocean age 2 or 3, whereas hatchery-reared were predominantly ocean age 1 or 2. On average, wild Chinook salmon were larger than their hatchery-reared components of the same sex and age class. The sex composition of the wild Chinook salmon run ranged from 18% to 61% female, whereas the hatchery-reared sex composition ranged from 27% to 42% female. Approximately 150,000 age-0 smolt were stocked annually upstream of the weir (RKM 25.8) during 2016–2018, continuing the supplementation of the Ninilchik River with hatchery-reared Chinook salmon. The stocking occurred during the third week in May in 2016 and 2018. In 2017, smolt were stocked in early May at RKM 7.7. The broodstock collection goal to restock the Ninilchik River was met in all years. In 2017, instead of using Ninilchik River broodstock to stock Kachemak Bay terminal fisheries, broodstocks from other Cook Inlet locations were used. In 2018, extra Ninilchik River broodstock was collected to make up for regional broodstock shortfalls. Stocking in Halibut Cove Lagoon was discontinued after 2017 in favor of increased stocking at Nick Dudiak Fishing Lagoon where adaptive stocking methods were used in all years to avoid mortality associated with Chaetoceros spp. diatoms.

Download or read book Ninilchik River Chinook Salmon Stock Assessment and Supplementation 2009 written by Michael D. Booz and published by . This book was released on 2012 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: From July 3-31, 2009, wild (naturally-produced) and hatchery-reared Chinook salmon, Oncorhynchus tshawytscha, runs to the Ninilchik River were assessed with a weir to determine the stock composition of total escapements. The Ninilchik River Chinook salmon supplementation program has provided important sport fishing opportunities for the Ninilchik River and terminal saltwater fisheries. Continuation of the Chinook salmon assessment at Ninilchik River weir is recommended to ensure that adequate escapement of wild Chinook salmon is maintained.

Download or read book Ninilchik River Chinook Salmon Stock Assessment and Supplementation 2008 written by Michael D. Booz and published by . This book was released on 2011 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: From 30 June through 7 August 2008, wild (naturally-produced) and hatchery-reared Chinook salmon, Oncorhynchus tshawytscha, runs to the Ninilchik River were assessed with a weir to determine the stock composition of total escapements. The Ninilchik River Chinook salmon supplementation program has provided important sport fishing opportunities for the Ninilchik River and terminal saltwater fisheries. Continuation of the Chinook salmon assessment at Ninilchik River weir is recommended to ensure that adequate escapement of wild Chinook salmon is maintained.

Download or read book Anchor River Chinook Salmon Stock Status Update 2004 written by Carol M. Kerkvliet and published by . This book was released on 2004 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ninilchik River Chinook Salmon Stock Assessment and Supplementation 2010 written by Michael D. Booz and published by . This book was released on 2016 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2010, the total number of Chinook salmon counted at the Ninilchik River weir was 658 fish, of which 623 were wild and 35 were hatchery-reared. The wild Chinook salmon escapement corresponding to the sustainable escapement goal (SEG) index monitoring period (3 July through 31 July) was 605 fish, which fell within the SEG range of 550-1,300 fish. Based on the dates of the median run times during the SEG index monitoring period, the wild Chinook salmon run was 8 days earlier than the hatchery-reared Chinook salmon run. The dominant age class was ocean age 2 for both wild and hatchery-reared Chinook salmon. No egg takes were conducted in 2010. Stocking goals were met for the Ninilchik River and all Kachemak Bay terminal saltwater fishery locations. The Ninilchik River Chinook salmon supplementation program has continued to provide sport fishing opportunities on the Ninilchik River and terminal saltwater fisheries. Continuation of Chinook salmon assessment at the Ninilchik River weir is recommended to ensure that adequate escapement of wild Chinook salmon is maintained.

Download or read book Stock Assessment of Late run Chinook Salmon in the Kenai River 1999 2006 written by Timothy R. McKinley and published by . This book was released on 2010 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: The status of late-run Chinook salmon Oncorhynchus tshawytscha in the Kenai River was assessed using information from creel surveys, an inriver sonar project, educational harvests, an inriver gillnetting project, personal use fishery harvests, commercial fishery harvests, and the Alaska Statewide Harvest Survey. This report updates stock assessment statistics with data from 1999-2006.