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The early marine distribution of Atlantic salmon in the North‐east Atlantic: A genetically informed stock‐specific synthesis

John Gilbey, Kjell Rong Utne, Vidar Wennevik, Alexander Christian Beck, Kyrre Kausrud, Kjetil Hindar, Carlos Garcia De Leaniz Orcid Logo, Corrine Cherbonnel, Jamie Coughlan, Tom F. Cross, Eileen Dillane, Dennis Ensing, Eva García‐Vázquez, Lars R. Hole, Marianne Holm, Jens Christian Holst, Jan Arge Jacobsen, Arne J. Jensen, Sten Karlsson, Niall Ó Maoiléidigh, Kjell Arne Mork, Einar Eg Nielsen, Leif Nøttestad, Craig R. Primmer, Paulo Prodöhl, Sergey Prusov, Jamie R. Stevens, Katie Thomas, Ken Whelan, Philip McGinnity, Eric Verspoor

Fish and Fisheries, Volume: 22, Issue: 6, Pages: 1274 - 1306

Swansea University Author: Carlos Garcia De Leaniz Orcid Logo

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DOI (Published version): 10.1111/faf.12587

Abstract

The survival of Atlantic salmon (Salmo salar), an increasingly rare anadromous species, has declined dramatically during its marine phase, with disproportionate impacts on the poorly understood early post-smolt period. Logistical constraints on collecting oceanic data to inform this issue pose a for...

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Published in: Fish and Fisheries
ISSN: 1467-2960 1467-2979
Published: Wiley 2021
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa58745
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Abstract: The survival of Atlantic salmon (Salmo salar), an increasingly rare anadromous species, has declined dramatically during its marine phase, with disproportionate impacts on the poorly understood early post-smolt period. Logistical constraints on collecting oceanic data to inform this issue pose a formidable obstacle. To advance understanding of post-smolt distributional ecology in the North-east Atlantic, a comprehensive analysis of existing information was undertaken. Data were synthesized from 385 marine cruises, 10,202 individual trawls, and 9,269 captured post-smolts, spanning three decades and ~4.75 million km2 of ocean, with 3,423 individuals genetically assigned to regional phylogeographic origin. The findings confirm major migrational post-smolt aggregations on the continental shelf-edge off Ireland, Scotland and Norway, and an important marine foraging area in the Norwegian Sea. Genetic analysis shows that aggregational stock composition does not simply reflect distance to natal rivers, with northern phylogeographic stock groups significantly under-represented in sampled high-seas aggregations. It identifies a key foraging habitat for southern European post-smolts located in international waters immediately west of the Vøring Plateau escarpment, potentially exposing them to a high by-catch mortality from extra-territorial pelagic fisheries. Evidence of the differential distribution of regional stocks points to fundamental differences in their migration behaviours and may lead to inter-stock variation in responses to environmental change and marine survival. The study shows that understanding of post-smolt marine ecology, as regards to stock-specific variations in habitat utilization, biological performance and exposure to mortality factors, can be significantly advanced by data integration across studies and exploiting genetic approaches.
Keywords: genetic stock identification; marine distribution; migration behaviour; pelagic trawls; post-smolts; Salmo salar
College: College of Science
Funders: Norges Forskningsråd. Grant Number: 280308; Seventh Framework Programme. Grant Number: 212529
Issue: 6
Start Page: 1274
End Page: 1306