Genetic evidence of local exploitation of Atlantic salmon in a coastal subsistence fishery in the Northwest Atlantic

Fisheries targeting mixtures of populations risk the overutilization of minor stock constituents unless harvests are monitored and managed. We evaluated stock composition and exploitation of Atlantic salmon (Salmo salar) in a subsistence fishery in coastal Labrador, Canada, using genetic mixture ana...

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Bibliographic Details
Published in:Canadian Journal of Fisheries and Aquatic Sciences
Main Authors: Bradbury, I. R. (Ian Robert), Bernatchez, Louis, Hamilton, Lorraine C., Rafferty, Sara, Meerburg, David John, Poole, Rebecca, Dempson, J.B., Robertson, Martha J., Reddin, D. G., Bourret, Vincent, Dionne, Mélanie, Chaput, Gerald J., Sheehan, Timothy F., King, Timothy L., Candy, John R
Format: Other/Unknown Material
Language:English
Published: NRC Research Press 2016
Subjects:
Saumon atlantique > Détection
Pêche de subsistance
Pêches
Génétique
Newfoundland
Canada
Belle Isle
Strait of Belle Isle
Atlantic salmon
Northwest Atlantic
Salmo salar
Online Access:https://hdl.handle.net/20.500.11794/287
https://doi.org/10.1139/cjfas-2014-0058
Description
Summary:Fisheries targeting mixtures of populations risk the overutilization of minor stock constituents unless harvests are monitored and managed. We evaluated stock composition and exploitation of Atlantic salmon (Salmo salar) in a subsistence fishery in coastal Labrador, Canada, using genetic mixture analysis and individual assignment with a microsatellite baseline (15 loci, 11 829 individuals, 12 regional groups) encompassing the species’ western Atlantic range. Bayesian and maximum likelihood mixture analyses of fishery samples over 6 years (2006–2011; 1772 individuals) indicate contributions of adjacent stocks of 96%–97%. Estimates of fishery-associated exploitation were highest for Labrador salmon (4.2%–10.6% per year) and generally <1% for other regions. Individual assignment of fishery samples indicated nonlocal contributions to the fishery (e.g., Quebec, Newfoundland) were rare and primarily in southern Labrador, consistent with migration pathways utilizing the Strait of Belle Isle. This work illustrates how genetic analysis of mixed stock Atlantic salmon fisheries in the Northwest Atlantic using this new baseline can disentangle exploitation and reveal complex migratory behaviours. En l’absence de surveillance et de gestion des prises, les pêches qui ciblent des mélanges de populations posent un risque de surutilisation de stocks mineurs. Nous avons évalué la composition et l’exploitation des stocks de saumons atlantiques (Salmo salar) dans une pêche de subsistance sur la côte du Labrador (Canada) par l’analyse des mélanges génétiques et l’affectation d’individus à la lumière de données microsatellitaires de référence (15 microsatellites, 11 829 individus, 12 groupes régionaux) couvrant l’aire de réparation de l’espèce dans la partie ouest de l’océan Atlantique. Les analyses bayésiennes et de maximum de vraisemblance de mélanges d’échantillons tirés de cette pêche sur une période de 6 ans (2006–2011, 1772 individus) indiquent que les stocks adjacents constituent de 96 % à 97 % de cette pêche. Les ...

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