Genetic mixed stock analysis of an interceptory Atlantic salmon fishery in the Northwest Atlantic

Ian R. Bradbury, Lorraine C. Hamilton, Gerald Chaput, Martha J. Robertson, Herlé Goraguer, Arthur Walsh, Vicki Morris, David Reddin, J. Brian Dempson, Timothy F. Sheehan, Timothy Lee King, Louis Bernatchez

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

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. Pierre and 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 Newfoundland). 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 marine species.

Original languageEnglish (US)
Pages (from-to)234-244
Number of pages11
JournalFisheries Research
Volume174
DOIs
StatePublished - Feb 1 2016

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Salmo salar
salmon
fishery
fisheries
Newfoundland and Labrador
biological characteristics
Gulf of Saint Lawrence
winter
genetic analysis
age structure
marine fisheries
Northwest Atlantic
analysis
Quebec
dominance (genetics)
genetic techniques and protocols
water
microsatellite repeats
loci
fish

All Science Journal Classification (ASJC) codes

  • Aquatic Science

Cite this

Bradbury, I. R., Hamilton, L. C., Chaput, G., Robertson, M. J., Goraguer, H., Walsh, A., ... Bernatchez, L. (2016). Genetic mixed stock analysis of an interceptory Atlantic salmon fishery in the Northwest Atlantic. Fisheries Research, 174, 234-244. https://doi.org/10.1016/j.fishres.2015.10.009
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 Lee ; Bernatchez, Louis. / Genetic mixed stock analysis of an interceptory Atlantic salmon fishery in the Northwest Atlantic. In: Fisheries Research. 2016 ; Vol. 174. pp. 234-244.
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Bradbury, IR, Hamilton, LC, Chaput, G, Robertson, MJ, Goraguer, H, Walsh, A, Morris, V, Reddin, D, Dempson, JB, Sheehan, TF, King, TL & Bernatchez, L 2016, 'Genetic mixed stock analysis of an interceptory Atlantic salmon fishery in the Northwest Atlantic', Fisheries Research, vol. 174, pp. 234-244. https://doi.org/10.1016/j.fishres.2015.10.009

Genetic mixed stock analysis of an interceptory Atlantic salmon fishery 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 Lee; Bernatchez, Louis.

In: Fisheries Research, Vol. 174, 01.02.2016, p. 234-244.

Research output: Contribution to journalArticle

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T1 - Genetic mixed stock analysis of an interceptory Atlantic salmon fishery in the Northwest Atlantic

AU - Bradbury, Ian R.

AU - Hamilton, Lorraine C.

AU - Chaput, Gerald

AU - Robertson, Martha J.

AU - Goraguer, Herlé

AU - Walsh, Arthur

AU - Morris, Vicki

AU - Reddin, David

AU - Dempson, J. Brian

AU - Sheehan, Timothy F.

AU - King, Timothy Lee

AU - Bernatchez, Louis

PY - 2016/2/1

Y1 - 2016/2/1

N2 - 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. Pierre and 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 Newfoundland). 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 marine species.

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