Download or read book Escapement and Harvest of Chilkoot River Sockeye Salmon 2007 2012 written by Randall L. Bachman and published by . This book was released on 2014 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of a stock assessment program conducted by the Alaska Department of Fish and Game, Division of Commercial Fisheries to estimate escapements and harvest of adult Chilkoot Lake sockeye salmon (Oncorhynchus nerka) in 2007-2012.
Download or read book Escapement and Harvest of Chilkoot River Sockeye Salmon 2004 2006 written by Randall L. Bachman and published by . This book was released on 2013 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of a stock assessment program conducted by the Alaska Department of Fish and Game, Division of Commercial Fisheries to estimate escapements and harvest of adult Chilkoot Lake sockeye salmon (Oncorhynchus nerka) in 2004-2006.
Download or read book Chilkoot Lake Sockeye Salmon Stock Status and Escapement Goal Review written by Rich Brenner and published by . This book was released on 2018 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chilkoot Lake, located in upper Lynn Canal near the city of Haines, supports one of the largest runs of sockeye salmon (Oncorhynchus nerka) in southeast Alaska. This stock is currently managed as a sustainable escapement goal range with a lower bound of 38,000 and an upper bound of 86,000 spawners. Escapement is monitored by the Alaska Department of Fish and Game with a weir on the Chilkoot River, and stock of origin from the District 15 commercial drift gillnet fishery harvest is determined using scale pattern analysis. We used Ricker spawner-recuit models in a Bayesian framework to fit data from brood years 1976-2010. Given significant autocorrelation at lag-1, we chose an autoregressive Ricker model for this assessment. Based on model results, maximum sustainable yield would be achieved with an escapement of approximately 52,900 sockeye salmon (median of spawning abundance at maximum sustained yield), and a range of 45,000-60,000 spawners would result in a greater than 80% probability of achieving at least 90% of maximum sustainable yield. This range of escapements fits within the current escapement goal range and, given considerable uncertainty in parameter estimates, we do not recommend changes to the goal at this time. However, some large escapements since 2012 will provide contrast to the existing data once the resulting recruits can be enumerated; thus, we recommend reassessing this escapement goal prior to the Alaska Board of Fisheries meeting in 2021.
Download or read book Chilkat Lake Sockeye Salmon Escapement Goal Review written by Sara E. Miller and published by . This book was released on 2018 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: We reviewed the escapement goal for the Chilkat Lake sockeye salmon (Oncorhynchus nerka) run, which is intensely harvested in the District 15 commercial drift gillnet fishery in Lynn Canal, Southeast Alaska. The current biological escapement goal of 70,000 to 150,000 sockeye salmon was established in 2009, based on a spawner-recruit analysis with weir counts converted to mark-recapture units. We fit age-structured state-space spawner-recruit models to updated 1976-2016 data on abundance, harvest, age composition, and coefficients of variation to examine the effect of autocorrelation and fry plants on recruits and to recommend a new biological escapement goal in Dual-frequency Identification Sonar (DIDSON) units. Historical mark-recapture and weir counts were considered indices of escapement, while the DIDSON counts (2008-2016) were considered 'true' counts of escapement. Fishery management reference points as well as optimal yield, optimal recruitment, and overfishing profiles were estimated from the final state-space Ricker model. Estimates derived from the state-space Ricker model suggest that the probability of achieving yields greater than 90% of maximum sustained yield from escapements at the current upper and lower bounds is 62% and 34%, respectively, and an average 65% over the entire escapement goal range. Therefore, we recommend maintaining the current biological escapement goal of 70,000 to 150,000 sockeye salmon counted at the Chilkat Lake weir site with the DIDSON sonar.
Download or read book Estimation of Fraser River Sockeye Escapements from Commercial Harvest Data 1892 1944 written by International Pacific Salmon Fisheries Commission and published by . This book was released on 1992 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Production Harvest and Escapement of Chilkat River Coho Salmon 2009 2010 written by Brian W. Elliott and published by . This book was released on 2013 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to conduct a full stock assessment of Chilkat River coho salmon Oncorhynchus kisutch. Coho salmon smolt were captured in the Chilkat River during spring 2009, marked with an adipose fin clip and a coded wire tag (CWT), and sampled for age, weight, and length. In 2010, adult coho salmon were sampled for CWTs in sport and commercial fishery harvests throughout Southeast Alaska and in the Chilkat River to estimate the marked fraction. In addition, the 2010 escapement to the Chilkat River was estimated by expanding peak survey counts.
Download or read book Stock Assessment of Sockeye Salmon in the Buskin River 2007 2009 written by Julia S. Schmidt and published by . This book was released on 2010 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents 2007-2009 study results, including daily and seasonal sockeye salmon escapement counts, harvests, estimates of age and sex composition and mean-length-at-age by sex, and spawner-recruitment analyses of the Buskin River, Kodiak Island, Alaska.
Download or read book Sport Effort Harvest and Escapement of Sockeye Salmon in the Buskin River Kodiak Alaska 1988 written by John B. Murray and published by . This book was released on 1989 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Summary of Harvest and Escapement Information and Recommendations for Improved Data Collection and Escapement Goals for Unalakleet River Chinook Salmon written by Jeffrey L. Estensen and published by . This book was released on 2006 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides a description of the chinook salmon, Oncorhynchus tshawytscha, fisheries in the Unalakleet Area; summarizes available harvest, escapement, age and sex information for returns to the Unalakleet River; and provides recommendations for improved data collection and escapement goals.
Download or read book Biological Escapement Goals for Five Sockeye Salmon Stocks Returning to Streams in the Yakutat Area of Alaska written by John H. Clark and published by . This book was released on 1995 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Age compositions, escapements, and harvests of sockeye salmon Oncorhynchus nerka returning to the Alsek, Akwe, East Alsek, Italio, and Lost rivers ... was used to develop brood tables and to estimate spawner-recruit relationships"--Abstract.
Download or read book Kodiak Management Area Salmon Escapement and Catch Sampling Results 2007 written by Matthew Birch Foster and published by . This book was released on 2008 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Roughly 1.2 million sockeye salmon Oncorhynchus nerka were estimated to escape through Alaska Department of Fish and Game salmon counting weirs in the Kodiak Management Area (KMA) during 2007. Adult sockeye salmon were sampled for age, sex, and length determination on river systems in the KMA and approximately 14,000 escapement scale samples were used to represent escapement age compositions.
Download or read book Anchor River Chinook and Coho Salmon Escapement 2007 2008 written by Carol M. Kerkvliet and published by . This book was released on 2012 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Run Reconstruction and Escapement Goals for Alsek River Sockeye Salmon written by Douglas Murrell Eggers and published by . This book was released on 2011 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report discusses escapement goal analyses for stocks of sockeye salmon in the transboundary Alsek River and in one of its tributaries, the Klukshu River. Data and estimates for harvest, in-river run size, harvest rates, relative age composition, and escapements for calendar years 1976 through 2008 are provided.
Download or read book Sockeye Salmon Stock Status and Escapement Goals in Southeast Alaska written by Steven C. Heinl and published by . This book was released on 2011 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summarizes escapement and harvest information of sockeye salmon in the southeast Alaska and Yakutat areas.
Download or read book Chinook Salmon Escapement in the Gulkana River 2007 2008 written by Linda J. Perry-Plake and published by . This book was released on 2009 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Takotna River Salmon Studies 2007 written by Daniel J. Costello and published by . This book was released on 2008 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Takotna River is a tributary of the upper Kuskokwim River that supports runs of Pacific salmon Oncorhynchus spp. A weir operated on the Takotna River is one of several projects operated in the Kuskokwim Area that form an integrated geographic array of escapement monitoring projects. Collectively, and in accordance with the State of Alaska's Policy for the Management of Sustainable Salmon Fisheries (5 AAC 39.222), this array of projects is a tool to ensure appropriate geographic and temporal distribution of spawners, and provides a means to track trends in escapement that should be monitored and considered in harvest management decisions. To this end, Takotna River weir has been operated annually since 2000 to determine daily and total salmon escapements; to estimate age, sex, and length compositions of Chinook, chum, and coho salmon escapement; to monitor environmental variables that influence salmon productivity; and to serve as part of an integrated platform in support of other Kuskokwim Area fisheries projects.
Download or read book Kogrukluk River Salmon Studies 2007 written by Derick L. Williams and published by . This book was released on 2008 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Kogrukluk River produces Chinook salmon Oncorhynchus tshawytscha, chum salmon O. keta, sockeye salmon O. nerka, and coho salmon O. kisutch that contribute to intensive subsistence and commercial salmon fisheries downstream. Located in the upper Holitna River basin, which is a major tributary of the Kuskokwim River, the Kogrukluk River weir is one of several projects operated in the Kuskokwim Area that form an integrated geographic array of escapement monitoring projects. Collectively, and in accordance with the State of Alaska's Policy for the Management of Sustainable Salmon Fisheries (5 AAC 39.222), this array of projects provides the means to assess escapement trends that must be monitored and considered in harvest management decisions. Towards this end, the Kogrukluk River weir has been operated annually since 1976 to determine daily and total salmon escapements of returning salmon species; to estimate age, sex, and length compositions of Chinook, chum, and coho salmon escapement; to monitor environmental variables that influence salmon productivity; and to contribute to an integrated platform in support of other Kuskokwim Area fisheries projects. In 2007, a fixed-picket weir was operated on the Kogrukluk River from 26 June through 23 September, with a total of 24 inoperable days. In addition to enumerating escapement and estimating ASL composition, the weir served as a platform for other projects, including Kuskokwim River Chinook Salmon Run Reconstruction and Kuskokwim River Sockeye Salmon Investigations. Furthermore, the weir project served as a sampling location for the collection of pink salmon (O. gorbuscha) and Dolly Varden (Salvelinus malma) genetic tissue.
