Seasonal migration, site fidelity, and population structure of European seabass (Dicentrarchus labrax)

Type Article
Date 2023-08
Language English
Author(s) de Pontual HeleneORCID1, Heerah Karine2, Goossens Jolien3, 4, Garren Francois1, Martin Stephane1, Le Ru Loic1, Le Roy Didier1, Woillez MathieuORCID1
Affiliation(s) 1 : DECOD (Ecosystem Dynamics and Sustainability), IFREMER, INRAE, Institut Agro, 29280 Plouzané, France
2 : France Energies Marines, 29280 Plouzané, France
3 : Marine Biology Research Group, Ghent University, 9000 Ghent, Belgium
4 : Flanders Marine Institute, 8400 Oostende, Belgium
Source Ices Journal Of Marine Science (1054-3139) (Oxford university press), 2023-08 , Vol. 80 , N. 6 , P. 1606-1618
DOI 10.1093/icesjms/fsad087
WOS© Times Cited 2
Keyword(s) biologging, depth, Dicentrarchus labrax, DST data storage tag, European sea bass, geolocation model, large-scale electronic tagging, movement ecology, spawning site fidelity, stock structure, temperature

Large-scale electronic tagging is a very powerful tool to study how fish movements and migrations shape the internal dynamics of populations. This knowledge, crucial for improving fishery management, was still limited for the European seabass, whose stocks in the Northeast Atlantic have declined drastically over the last decade. To better understand the species ecology and the spatio-temporal structure of the population, we tagged seabass in the North Sea, the English Channel, and the Bay of Biscay, from 2014 to 2016. Out of 1220 deployed DSTs, 482 have been recovered by November 2022. Approximately half of them included a period of potential spawning migration. Reconstructed trajectories confirmed seabass to be a partial migratory species, as individuals exhibited either long-distance migrations or residence. Most migrants exhibited fidelity to summer feeding areas and winter spawning areas. Our dataset enriches the knowledge of seabass biological traits (e.g. temperature and depth ranges, vulnerability to predation and fishing). Our results suggest a spatial structure of the Atlantic population that differs from the stock structure currently considered for assessment and management. The consequences should be explored at both the European level and by regional managers involved in conservation outcomes.

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de Pontual Helene, Heerah Karine, Goossens Jolien, Garren Francois, Martin Stephane, Le Ru Loic, Le Roy Didier, Woillez Mathieu (2023). Seasonal migration, site fidelity, and population structure of European seabass (Dicentrarchus labrax). Ices Journal Of Marine Science, 80(6), 1606-1618. Publisher's official version : , Open Access version :