Genetic mixed stock analysis of an interceptory Atlantic salmonfishery in the Northwest Atlantic
Interceptory fisheries represent an ongoing threat to migratory fish stocks particularly when managed in the absence of stock specific catch and exploitation information. Atlantic salmon from the southern portion of the North American range may be subject to exploitation in the commercial and recrea...
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ftunivnebraskali:oai:digitalcommons.unl.edu:usdeptcommercepub-1529 2023-11-12T04:14:31+01:00 Genetic mixed stock analysis of an interceptory Atlantic salmonfishery in the Northwest Atlantic Bradbury, Ian R. Hamilton, Lorraine C. Chaput, Gerald Robertson, Martha J. Goraguer, Herlé Walsh, Arthur Morris, Vicki Reddin, David Dempson, J. Brian Sheehan, Timothy F. King, Timothy Bernatchez, Louis 2016-01-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/usdeptcommercepub/530 https://digitalcommons.unl.edu/context/usdeptcommercepub/article/1529/viewcontent/Bradbury_FR_2016_Genetic_mixed_stock.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/usdeptcommercepub/530 https://digitalcommons.unl.edu/context/usdeptcommercepub/article/1529/viewcontent/Bradbury_FR_2016_Genetic_mixed_stock.pdf Publications, Agencies and Staff of the U.S. Department of Commerce Mixed-stock analysis Genetic Assignment Atlantic salmon Genetic structure Microsatellites text 2016 ftunivnebraskali 2023-10-30T09:52:43Z Interceptory fisheries represent an ongoing threat to migratory fish stocks particularly when managed in the absence of stock specific catch and exploitation information. Atlantic salmon from the southern portion of the North American range may be subject to exploitation in the commercial and recreational salmon fisheries occurring in the French territorial waters surrounding St. Pierre and Miquelon off southern Newfoundland. We evaluated stock composition of Atlantic salmon harvested in the St. Pierreand Miquelon Atlantic salmon fishery using genetic mixture analysis and individual assignment with a microsatellite baseline (15 loci, 12,409 individuals, 12 regional groups) encompassing the species western Atlantic range. Individual salmon were sampled from the St. Pierre and Miquelon fishery over four years (2004, 2011, 2013, and 2014). Biological characteristics indicate significant variation among years in the size and age distribution. Nonetheless, estimates of stock composition of the samples showed consistent dominance of three regions (i.e., Southern Gulf of St. Lawrence, Gaspe Peninsula, and New-foundland). Together salmon from these regions accounted for more than 70% of annual harvest over the decade examined. Comparison of individual assignments and biological characteristics revealed a trend of declining fresh water age with latitude of assigned region. Moreover, locally harvested Newfoundland salmon were ten times more likely to be small or one sea winter individuals whereas Quebec and Gaspe Peninsula salmon were two-three times more likely to be harvested as large or two sea winter salmon.Estimates of region specific catch were highest for salmon from the southern Gulf of St. Lawrence region ranging from 242 to 887 individuals annually. This work illustrates how genetic analysis of interceptory marine fisheries can directly inform assessment and management efforts in highly migratory marines pecies. Text Atlantic salmon Newfoundland Northwest Atlantic University of Nebraska-Lincoln: DigitalCommons@UNL |
institution |
Open Polar |
collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
topic |
Mixed-stock analysis Genetic Assignment Atlantic salmon Genetic structure Microsatellites |
spellingShingle |
Mixed-stock analysis Genetic Assignment Atlantic salmon Genetic structure Microsatellites Bradbury, Ian R. Hamilton, Lorraine C. Chaput, Gerald Robertson, Martha J. Goraguer, Herlé Walsh, Arthur Morris, Vicki Reddin, David Dempson, J. Brian Sheehan, Timothy F. King, Timothy Bernatchez, Louis Genetic mixed stock analysis of an interceptory Atlantic salmonfishery in the Northwest Atlantic |
topic_facet |
Mixed-stock analysis Genetic Assignment Atlantic salmon Genetic structure Microsatellites |
description |
Interceptory fisheries represent an ongoing threat to migratory fish stocks particularly when managed in the absence of stock specific catch and exploitation information. Atlantic salmon from the southern portion of the North American range may be subject to exploitation in the commercial and recreational salmon fisheries occurring in the French territorial waters surrounding St. Pierre and Miquelon off southern Newfoundland. We evaluated stock composition of Atlantic salmon harvested in the St. Pierreand Miquelon Atlantic salmon fishery using genetic mixture analysis and individual assignment with a microsatellite baseline (15 loci, 12,409 individuals, 12 regional groups) encompassing the species western Atlantic range. Individual salmon were sampled from the St. Pierre and Miquelon fishery over four years (2004, 2011, 2013, and 2014). Biological characteristics indicate significant variation among years in the size and age distribution. Nonetheless, estimates of stock composition of the samples showed consistent dominance of three regions (i.e., Southern Gulf of St. Lawrence, Gaspe Peninsula, and New-foundland). Together salmon from these regions accounted for more than 70% of annual harvest over the decade examined. Comparison of individual assignments and biological characteristics revealed a trend of declining fresh water age with latitude of assigned region. Moreover, locally harvested Newfoundland salmon were ten times more likely to be small or one sea winter individuals whereas Quebec and Gaspe Peninsula salmon were two-three times more likely to be harvested as large or two sea winter salmon.Estimates of region specific catch were highest for salmon from the southern Gulf of St. Lawrence region ranging from 242 to 887 individuals annually. This work illustrates how genetic analysis of interceptory marine fisheries can directly inform assessment and management efforts in highly migratory marines pecies. |
format |
Text |
author |
Bradbury, Ian R. Hamilton, Lorraine C. Chaput, Gerald Robertson, Martha J. Goraguer, Herlé Walsh, Arthur Morris, Vicki Reddin, David Dempson, J. Brian Sheehan, Timothy F. King, Timothy Bernatchez, Louis |
author_facet |
Bradbury, Ian R. Hamilton, Lorraine C. Chaput, Gerald Robertson, Martha J. Goraguer, Herlé Walsh, Arthur Morris, Vicki Reddin, David Dempson, J. Brian Sheehan, Timothy F. King, Timothy Bernatchez, Louis |
author_sort |
Bradbury, Ian R. |
title |
Genetic mixed stock analysis of an interceptory Atlantic salmonfishery in the Northwest Atlantic |
title_short |
Genetic mixed stock analysis of an interceptory Atlantic salmonfishery in the Northwest Atlantic |
title_full |
Genetic mixed stock analysis of an interceptory Atlantic salmonfishery in the Northwest Atlantic |
title_fullStr |
Genetic mixed stock analysis of an interceptory Atlantic salmonfishery in the Northwest Atlantic |
title_full_unstemmed |
Genetic mixed stock analysis of an interceptory Atlantic salmonfishery in the Northwest Atlantic |
title_sort |
genetic mixed stock analysis of an interceptory atlantic salmonfishery in the northwest atlantic |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2016 |
url |
https://digitalcommons.unl.edu/usdeptcommercepub/530 https://digitalcommons.unl.edu/context/usdeptcommercepub/article/1529/viewcontent/Bradbury_FR_2016_Genetic_mixed_stock.pdf |
genre |
Atlantic salmon Newfoundland Northwest Atlantic |
genre_facet |
Atlantic salmon Newfoundland Northwest Atlantic |
op_source |
Publications, Agencies and Staff of the U.S. Department of Commerce |
op_relation |
https://digitalcommons.unl.edu/usdeptcommercepub/530 https://digitalcommons.unl.edu/context/usdeptcommercepub/article/1529/viewcontent/Bradbury_FR_2016_Genetic_mixed_stock.pdf |
_version_ |
1782332176778395648 |