Genetic Stock Composition Analysis of Chum Salmon Bycatch from the 2013 Bering Sea Walleye Pollock Trawl Fishery PDF Download
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Author: Jackie Whittle
Publisher:
ISBN:
Category : Bycatches (Fisheries)
Languages : en
Pages : 50
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Book Description
A genetic analysis of chum salmon (Oncorhynchus keta) bycatch from the 2013 Bering Sea walleye pollock (Gadus chalcogrammus) trawl fishery was undertaken to determine the overall stock composition of the sample set. Samples were genotyped for 11 microsatellite markers and results were estimated using the current chum salmon microsatellite baseline. Since 2011, genetic samples from the chum salmon bycatch were collected systematically to reduce sample biases that may exist in collections from previous years. In 2013, one genetic sample was collected for every 30.3 chum salmon caught in the 99.8% of the mid water trawl fishery that was sampled. Evaluation of sampling based on time, location, and vessel indicated that the genetic samples were representative of the total bycatch. Based on the analysis of 3,880 chum salmon bycatch samples collected throughout the 2013 Bering Sea trawl fishery, the North east Asia stocks dominated the sample set ( 45 %); moderate contributions came from Southeast Asia (15 %), Eastern Gulf of Alaska (GOA)/Pacific Northwest (PNW) (15%), and Western Alaska (18%) stocks, and smaller contributions came from Upper/Middle Yukon River (6 %) and Southwest Alaska (1%) stocks. The regional stock estimates for the 2013 chum salmon bycatch were similar to those for the 2012 bycatch, but differed significantly from estimates for other years, especially for the Asian and the Eastern GOA/PNW regions. There were significant spatial differences in stock distribution with the South east Asia contribution higher in the northwestern U.S. waters of the Bering Sea than in the southeastern Bering Sea, and the Eastern GOA/PNW contribution highest in the easternmost area sampled in the southeastern Bering Sea. Analysis of temporal strata revealed changes in stock composition during the course of the fall "B" season with increasing contribution of Northeast Asia stocks, decreasing contribution of Eastern GOA/PNW stocks, and variable contribution from Southeast Asia and Western Alaska.
Author: Jackie Whittle
Publisher:
ISBN:
Category : Bycatches (Fisheries)
Languages : en
Pages : 50
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Book Description
A genetic analysis of chum salmon (Oncorhynchus keta) bycatch from the 2013 Bering Sea walleye pollock (Gadus chalcogrammus) trawl fishery was undertaken to determine the overall stock composition of the sample set. Samples were genotyped for 11 microsatellite markers and results were estimated using the current chum salmon microsatellite baseline. Since 2011, genetic samples from the chum salmon bycatch were collected systematically to reduce sample biases that may exist in collections from previous years. In 2013, one genetic sample was collected for every 30.3 chum salmon caught in the 99.8% of the mid water trawl fishery that was sampled. Evaluation of sampling based on time, location, and vessel indicated that the genetic samples were representative of the total bycatch. Based on the analysis of 3,880 chum salmon bycatch samples collected throughout the 2013 Bering Sea trawl fishery, the North east Asia stocks dominated the sample set ( 45 %); moderate contributions came from Southeast Asia (15 %), Eastern Gulf of Alaska (GOA)/Pacific Northwest (PNW) (15%), and Western Alaska (18%) stocks, and smaller contributions came from Upper/Middle Yukon River (6 %) and Southwest Alaska (1%) stocks. The regional stock estimates for the 2013 chum salmon bycatch were similar to those for the 2012 bycatch, but differed significantly from estimates for other years, especially for the Asian and the Eastern GOA/PNW regions. There were significant spatial differences in stock distribution with the South east Asia contribution higher in the northwestern U.S. waters of the Bering Sea than in the southeastern Bering Sea, and the Eastern GOA/PNW contribution highest in the easternmost area sampled in the southeastern Bering Sea. Analysis of temporal strata revealed changes in stock composition during the course of the fall "B" season with increasing contribution of Northeast Asia stocks, decreasing contribution of Eastern GOA/PNW stocks, and variable contribution from Southeast Asia and Western Alaska.
Author: Charles. M. Guthrie
Publisher:
ISBN:
Category : Bycatches (Fisheries)
Languages : en
Pages : 21
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Book Description
A genetic analysis of samples from the Chinook salmon (Oncorhynchus tshawytscha) bycatch of the 2013 Bering Sea - Aleutian Island (BSAI) trawl fishery for walleye pollock (Gadus chalcogrammus) was undertaken to determine the overall stock composition of the bycatch. Samples were genotyped for 43 single nucleotide polymorphism (SNP) DNA markers and results were estimated using the Alaska Department of Fish and Game (ADF&G) SNP baseline. In 2013, genetic samples from the Bering Sea were collected using a systematic random sampling protocol where one out of every 10 Chinook salmon encountered was sampled. Based on the analysis of 1,246 Chinook salmon bycatch samples collected throughout the 2013 BSAI walleye pollock trawl fishery, Coastal Western Alaska stocks dominated the sample set (50 %) with smaller contributions from British Columbia (16 %), North Alaska Peninsula (14 %), and West Coast U.S. (OR/CA/WA) (7 %) stocks. Analysis of temporal groupings within the pollock "A" and "B" seasons revealed changes in stock composition during the course of the year with lower contributions of North Alaska Peninsula and Upper Yukon stocks and higher contributions of West Coast U.S. and NW Gulf of Alaska stocks during the "B" season .
Author: Charles. M. Guthrie
Publisher:
ISBN:
Category : Bycatches (Fisheries)
Languages : en
Pages : 33
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Book Description
A genetic analysis of samples from the Chinook salmon (Oncorhynchus tshawytscha) bycatch of the 2015 Bering Sea-Aleutian Island (BSAI) trawl fishery for walleye pollock (Gadus chalcogrammus) was undertaken to determine the overall stock composition of the bycatch. Samples were genotyped for 43 single nucleotide polymorphism (SNP) DNA markers and results were estimated using the Alaska Department of Fish and Game (ADF&G) SNP baseline. In 2015, genetic samples from the Bering Sea were collected using a systematic random sampling protocol where one out of every 10 Chinook salmon encountered was sampled. Based on the analysis of 1,757 Chinook salmon bycatch samples collected throughout the 2015 BSAI walleye pollock trawl fishery, Coastal Western Alaska stocks dominated the sample set (40%) with smaller contributions from British Columbia (22%), West Coast U.S. (WA/OR/CA) (15%), and North Alaska Peninsula (11%) stocks. Analysis of temporal groupings within the pollock "A" and "B" seasons revealed changes in stock composition during the course of the year with lower contributions of Coastal Western Alaska, North Alaska Peninsula, and Upper Yukon stocks and higher contributions of West Coast U.S. (WA/OR/CA), British Columbia, NW Gulf of Alaska, and Coastal Southeast Alaska stocks during the "B" season. [doi:10.7289/V5/TM-AFSC-342 (http://dx.doi.org/10.7289/V5/TM-AFSC-342)]
Author: Charles. M. Guthrie
Publisher:
ISBN:
Category : Bycatches (Fisheries)
Languages : en
Pages : 32
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Book Description
A genetic analysis of samples from the Chinook salmon (Oncorhynchus tshawytscha) bycatch of the 2016 Bering Sea-Aleutian Island (BSAI) trawl fishery for walleye pollock (Gadus chalcogrammus) was undertaken to determine the overall stock composition of the bycatch. Samples were genotyped for 43 single nucleotide polymorphism (SNP) DNA markers and results were estimated using the Alaska Department of Fish and Game (ADF&G) SNP baseline. In 2016, genetic samples from the Bering Sea were collected using a systematic random sampling protocol where one out of every 10 Chinook salmon encountered was sampled. Based on the analysis of 1,910 Chinook salmon bycatch samples collected throughout the 2016 BSAI walleye pollock trawl fishery, Coastal Western Alaska and British Columbia regions (34% and 29% respectively) dominated the sample set with smaller contributions from West Coast US (14%), and North Alaska Peninsula (13%) regions. Analysis of temporal groupings within the pollock "A" and "B" seasons revealed changes in stock composition during the course of the year with lower contributions of Coastal Western Alaska and North Alaska Peninsula regions and higher contributions of West Coast US, British Columbia, and NW Gulf of Alaska, regions during the "B" season when compared to the "A" season. . [doi:10.7289/V5/TM-AFSC-365 (https://doi.org/10.7289/V5/TM-AFSC-365)]
Author: Charles. M. Guthrie
Publisher:
ISBN:
Category : Bycatches (Fisheries)
Languages : en
Pages : 28
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Book Description
A genetic analysis of samples from the Chinook salmon (Oncorhynchus tshawytscha) bycatch of the 2011 Bering Sea-Aleutian Island (BSAI) and Gulf of Alaska (GOA) pollock trawl fisheries was undertaken to determine the stock composition of the sample set. Samples were genotyped for 43 single nucleotide polymorphism (SNP) DNA markers and results were estimated using the Alaska Department of Fish and Game (ADF&G) SNP baseline. In 2011, genetic samples from the Bering Sea were collected using a systematic random sampling protocol from one out of every 10 Chinook salmon encountered. Based on the analysis of 2,473 Chinook salmon bycatch samples collected throughout the 2011 BSAI walleye pollock (Theragra chalcogramma) trawl fishery, Coastal Western Alaska stocks dominated the sample set (68%) with smaller contributions from North Alaska Peninsula (9%), British Columbia (8%), and U.S. west coast (6%) stocks. Analysis of temporal groupings within the pollock "A" and "B" seasons revealed changes in stock composition during the course of the year with lower contributions of North Alaska Peninsula and Yukon River stocks during the "B" season. Genetic samples were also collected from Chinook salmon taken in the bycatch of the 2011 Gulf of Alaska (GOA) pollock trawl fisheries. In contrast with the Bering Sea, genetic samples were collected opportunistically in the GOA during 2011; consequently, the resulting stock composition estimates should be considered as stock compositions of the sample set rather than a representative composition of the entire GOA Chinook salmon bycatch. Based on the analysis of 240 Chinook salmon bycatch samples, British Columbia (40%) and U.S. west coast (26%) stocks comprised the largest stock groups with smaller contributions from Northwest GOA (15%) and Coastal Southeast Alaska (14%) stocks.
Author: Charles. M. Guthrie
Publisher:
ISBN:
Category : Bycatches (Fisheries)
Languages : en
Pages : 33
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Book Description
A genetic analysis of samples from the Chinook salmon (Oncorhynchus tshawytscha) bycatch of the 2012 Bering Sea-Aleutian Island (BSAI) and Gulf of Alaska (GOA) trawl fisheries for walleye pollock (Gadus chalcogrammus) was undertaken to determine the stock composition of the sample set. Samples were genotyped for 43 single nucleotide polymorphism (SNP) DNA markers and results were estimated using the Alaska Department of Fish and Game (ADF&G) SNP baseline. In 2012, genetic samples from the Bering Sea were collected using a systematic random sampling protocol where one out of every 10 Chinook salmon encountered was sampled. Based on the analysis of 1,111 Chinook salmon bycatch samples collected throughout the 2012 BSAI walleye pollock trawl fishery, Coastal Western Alaska stocks dominated the sample set (63%) with smaller contributions from North Alaska Peninsula (11%), British Columbia (10%), and West Coast U.S. (OR/CA/WA) (7%) stocks.
Author: Jeffrey Robert Guyon
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 26
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Book Description
The genetic stock composition of Chinook salmon (Oncorhynchus tshawytscha) samples from the 2012 U.S. Gulf of Alaska (GOA) trawl fishery for walleye pollock (Gadus chalcogrammus) was extended to provide an overall stock composition for the fishery bycatch and stock-specific harvests. Genetic samples were collected opportunistically in 2012 from Chinook salmon taken as the bycatch in this fishery. These samples had previously been genotyped for 43 single nucleotide polymorphism (SNP) DNA markers and the results were estimated using the available coastwide baseline of SNP markers for Chinook salmon. However, the opportunistic nature of the sampling raised concerns about applying the proportional composition of the samples to the entire bycatch because of unknown, but potentially significant, biases. Here we investigate the most appropriate means by which this extension can be made. While sample sizes varied widely and did not achieve the 10% target used to sample bycatch in the Bering Sea, using a stratified estimator weighted by stratum-specific bycatch, it was possible to estimate the stock composition of the total catch with acceptable accuracy and precision. Based on the re analysis of 948 Chinook salmon bycatch samples, the proportions o f reporting groups did not change significantly from previously published values: British Columbia (50%), U.S. West Coast (28%), and coastal Southeast Alaska (19 %) made up the largest reporting groups.
Author: Charles. M. Guthrie
Publisher:
ISBN:
Category : Bycatches (Fisheries)
Languages : en
Pages : 22
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Book Description
Author: Jeffrey Robert Guyon
Publisher:
ISBN:
Category : Bycatch excluder devices
Languages : en
Pages : 19
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Book Description
A genetic analysis of samples from the Chinook salmon (Oncorhynchus t shawytscha) bycatch of the 2013 Gulf of Alaska (GOA) trawl fisheries for Pacific rockfish (Sebastes spp.) and arrowtooth (Atheresthes stomias) flounder was undertaken to determine the stock composition of the sample sets. Samples were genotyped for 43 single nucleotide polymorphism (SNP) DNA markers and results were estimated using the Alaska Department of Fish and Game (ADF&G) SNP baseline. In 2013, genetic samples from the bycatch of the GOA rockfish fishery were collected by the fishing industry using a census sampling protocol where every Chinook salmon encountered was sampled. Based on the analysis of 2,029 Chinook salmon bycatch samples collected throughout the 2013 GOA rockfish trawl fishery, West Coast U.S. stocks (WA/OR/CA) represented the larges t stock grouping (60%) with smaller contributions from British Columbia (31%), Coastal Southeast Alaska (6%), and Northwest GOA (2%) stocks. Genetic samples were also collected from Chinook salmon taken in the bycatch of the 2013 GOA arrowtooth flounder tr awl fisheries. Those samples were collected opportunistically from a single vessel; consequently, the resulting stock composition estimates should be considered as stock compositions of the sample set rather than a representative composition of the overall bycatch. Based on the analysis of 279 Chinook salmon bycatch samples, West Coast U.S. (43%), British Columbia (39%), Coastal Southeast Alaska 14%), and Northwest GOA (3%) stocks comprised the largest stock groups. We also produced a stock composition estimate of Chinook salmon from a single test haul of the salmon excluder device performed in April 2013 in an area near Kodiak Island in Shelikof Strait. Stock composition results showed that the majority of those 95 Chinook salmon originated from West Coast U.S. (79%), British Columbia (17%), and Coastal Southeast Alaska (3%) stocks.
Author: Rebecca Lent
Publisher: Frontiers Media SA
ISBN: 288976043X
Category : Science
Languages : en
Pages : 218
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Book Description
