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Book Mark recapture Studies of Taku River Adult Sockeye Salmon Stocks in 2003

Download or read book Mark recapture Studies of Taku River Adult Sockeye Salmon Stocks in 2003 written by I. Boyce and published by . This book was released on 2005 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mark-recapture studies of adult Taku River sockeye salmon (Oncorhyncus nerka) stocks were conducted by the Alaska Department of Fish and Game and the Taku River Tlingit First Nation in 2003. The objectives of the studies were to provide inseason estimates of the inriver abundance of sockeye O. nerka and to document biological charactieristics (migratory timing, migratory raes and age, sex, and size composition) of Taku River sockeye stocks. Tagged-to-untaggedratios of salmon harvested in the Canadian inriver gillnet fisheries were used to develop the estimates of the inriver abundance of sockeye. A total of 5,969 sockeye salmon were captured in fish wheels located in Canyon Island, Alaska, of which 5,463, were tagged and 1,744 (31.9%) were subsequently recovered in fisheries or on the spawning grouds. The inriver run of sockeye salmon past Canyon Island from June 5 to September 17 was estimated to be 200,918 fish (95% confidence interval 180,905 to 220,931). Canadian commercial, aboriginal and test fisheries harvested 32,933, 267 and 27 sockeye, respectively, resulting in a spawning escapement estimate estimate of 167,691 sockeye salmon. Based on mean date and standard deviation of migration timing the sockeye salmon run was approximately one day earlier and more compressed than the 1984-2002 average. The Kuthai Lake sockeye salmon stocks dominated the early portion of the run, the Little Trapper Lake the middle portion, and the Tatsamenie Lake and mainstem stocks the late portion. The fish wheel catches of 15,604 pink salmon, 262 chum salmon, and 49steelhead salmon were 2.8%, 50.8% below average and 29,7% above average, respectively. The pinksalmon run was five days earlier and slightly more compressed than average.

Book Mark recapture Studies of Taku River Adult Sockeye Salmon Stocks from 1998 to 2002

Download or read book Mark recapture Studies of Taku River Adult Sockeye Salmon Stocks from 1998 to 2002 written by James Everett Andel and published by . This book was released on 2004 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annual mark-recapture studies of adult Taku River sockeye salmon (Oncorhyncus nerka) stocks were conducted by the Alaska Department of Fish and Game, the Canadian Department of Fisheries and Oceans and the Taku River First Nation from 1998 to 2002. The objectives of the program were: to provide annual inseason estimates of the inriver abundance of sockeye salmon and to document biological characteristics (migratory timing, migratory rates and age, sex, and size composition) of Taku River sockeye stocks. Marked-to unmarked ratios of salmon harvested in the Canadian inriver gillnet fisheries were used to develop estimates of the inriver abundance of sockeye. During the years 1998 to 2002, an annual averageof 5,349 sockeye salmon were tagged in fish wheels located at Canyon Island, Alaska, of which an average of 1,080 (20.2%) sockeye were subsequently recovered in fisheries or on the spawning grounds.The annual post-season inriver runestimates of sockeye salmon past Canyon Island from 1998 to 2002 was estimated to be 91,548, 113,705, 115,693, 192,269, and 135,233, fish respectively. Annual inriver Canadian commercial, aboriginal and test fisheries combined harvested 19,038, 20,681, 27,942, 47,998, and 31,053 sockeye salmon during those same years (1998 to 2002). The resulting annual spawning escapement estimtes for Taku River sockeye salmon from 1998 to 2002 was 72,271, 95,562, 87,298, 144,071, 103,343, fish respectively.The migratory timing (mean dates and standard deviation of migration) and run timing of the sockeye salmon run was similar to the 15 year average. The Kuthai Lake sockeye salmon stocks dominated the early portion, the Little Trapper Lake the middle portion, and the Tatsamenie Lake and mainstem stocks the late portion of the Taku River sockeye salmon run. Pink fish wheel catches were strong in 1998 and 1999 but below average in 2000 to 2002. Chum salmon fish wheel catches for this 5-year period continued to exhibit the trend of low catches that began in the mid-1980's.

Book Adult Mark recapture Studies of Taku River Salmon Stocks in 1989

Download or read book Adult Mark recapture Studies of Taku River Salmon Stocks in 1989 written by Andrew J. McGregor and published by . This book was released on 1991 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Mark recapture Studies of Taku River Adult Salmon Stocks in 1995

Download or read book Mark recapture Studies of Taku River Adult Salmon Stocks in 1995 written by M. Scott Kelley and published by . This book was released on 1997 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: A report on a study of tagging operations of chinook, sockeye, and coho salmon in the Taku River around Canyon Island, Alaska in order to estimate escapement.

Book A Comprehensive Review of Chilkat Lake and River Sockeye Salmon Stock Assessment Studies

Download or read book A Comprehensive Review of Chilkat Lake and River Sockeye Salmon Stock Assessment Studies written by Julie Bednarski and published by . This book was released on 2017 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1967 the Alaska Department of Fish and Game, Division of Commercial Fisheries, has operated a stock assessment program to estimate escapements and harvests of Chilkat sockeye salmon (Oncorhynchus nerka). Sockeye salmon were counted through a weir near the outlet of Chilkat Lake, and age, length, and sex data were collected and analyzed each year. Since 1994, mark-recapture studies were conducted to estimate Chilkat sockeye salmon escapements. Since the start of the 2008 season, DIDSON sonar has been used at the weir site to directly enumerate adult sockeye salmon escapement into Chilkat Lake. Visual scale pattern analysis was conducted to determine the proportion of Chilkat sockeye salmon harvested annually in the District 15 commercial drift gillnet fishery. In addition, limnological sampling was conducted in Chilkat Lake and analyzed each year. The intent of this report was to review Chilkat sockeye salmon stock assessment data from 1971 to 2016. The visual and DIDSON weir counts provide an index of escapement; however concerns regarding mark-recapture as a reliable index of abundance lead us to recommend eliminating mark-recapture studies in 2017 and, instead, maintain the DIDSON to estimate escapement into Chilkat Lake. We also recommend reviewing the current Chilkat Lake biological escapement goal to ensure that the goal and escapement estimates are in the same units, which is currently based on mark-recapture units. An average of 77,800 Chilkat Lake sockeye salmon were harvested annually in the District 15 commercial drift gillnet fishery (1976-2016). A comparison of historical fish wheel counts to Chilkat Lake escapement estimates demonstrates that the fish wheel project provides a rough indication of Chilkat Lake run strength. Zooplankton samples from Chilkat Lake were composed primarily of one species of copepod (Cyclops columbianus) and three species of cladocerans (Bosmina longerostris, Daphnia longiremus, and Daphnia rosea).

Book Stock Assessment Studies of Chilkat River Adult Sockeye and Chum Salmon Stocks in 2003 and 2004

Download or read book Stock Assessment Studies of Chilkat River Adult Sockeye and Chum Salmon Stocks in 2003 and 2004 written by Randall L. Bachman and published by . This book was released on 2010 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses the mark-recapture studies of adult Chilkat River sockeye (Oncorhynchus nerka) and chum (O. keta) salmon in 2003 and 2004 by the Alaska Department of Fish and Game and the Northern Southeastern Regional Aquaculture Association. These studies were done in order to estimate the escapement of chum and sockeye salmon in the Chilkat River, and sockeye salmon in Chilkat Lake, and to summarize age, sex, and length compositions for these populations.

Book Tagging Response Distribution and Migration of Taku River Sockeye Salmon 2020

Download or read book Tagging Response Distribution and Migration of Taku River Sockeye Salmon 2020 written by Raymond F. Vinzant and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2020, a radiotelemetry study was conducted on Taku River sockeye salmon (Oncorhynchus nerka) to assess dropout rates (and potential bias) in annual mark–recapture studies, and to estimate the spawning distribution and migration rates among stocks. Every sixth sockeye salmon captured in fish wheels was radiotagged (406 fish) and no differences were detected between the length distributions of radiotagged and nonradiotagged fish (i.e., spaghetti tagged fish in the mark–recapture study). The total fish wheel catch was estimated to be 29.6% river-type and 70.4% lake-type stocks, based on genetic stock identification analysis of radiotagged fish. King Salmon Lake was the largest contributor (30.5%), followed by mainstem Taku River (27.7%), Little Trapper Lake (14.3%), Kuthai Lake (13.0%), Tatsamenie Lake (12.6%), and Tatsatua Lake (1.7%). Analysis of tag recoveries, based on 24 aerial surveys, was used to determine fates of the 406 radiotagged fish. Two radiotagged fish were censored because they were not detected after deployment. Of the 404 remaining radiotagged fish, the estimated dropout rate was 17.8% (i.e., the proportion that did not cross the U.S./Canada border), 9.9% were harvested in the Canadian commercial fishery, and 72.3% were tracked to a probable spawning location. Based on aerial surveys, the estimated proportion of river- and lake-type stocks was 66.8% river-type and 33.2% lake-type. Three hundred forty-eight of the 404 radiotagged fish met or exceeded the 95% probability threshold required for individual genetic assignment to reporting group and were matched to the individual radiotagged fish tracked to probable spawning locations. Thirty-five individually assigned fish were harvested in the Canadian commercial fishery between 0 and 16 days after being radiotagged. On average, radiotagged fish were harvested 3 days after tagging and 48.6% were harvested less than 5 days after tagging.