Electronic tags reveal high migratory diversity within the largest Atlantic halibut (Hippoglossus hippoglossus) stock

Author:

Ransier Krista T.1ORCID,Gatti Paul12,Le Bris Arnault13ORCID,den Heyer Cornelia E.4ORCID,Claireaux Guy5,Wringe Brendan4,Fisher Jonathan A. D.1

Affiliation:

1. Centre for Fisheries Ecosystems Research, Fisheries and Marine Institute of Memorial University of Newfoundland, St. John's, NL, Canada

2. DECOD (Ecosystem Dynamics and Sustainability), Ifremer, INRAE, Institut Agro, ZI Pointe du Diable, Plouzané, France

3. Institute of Marine Research, PO Box 1870, N-5817; Bergen, Norway

4. Fisheries and Oceans Canada, Bedford Institute of Oceanography, Dartmouth, NS, Canada

5. Université de Bretagne Occidentale, Laboratoire des Sciences de l'Environnement Marin, Unité Phytness, Ifremer—Centre de Bretagne, 29280 Plouzané, France

Abstract

Growing evidence suggests that complex spatial structure occurs within the Scotian Shelf and southern Grand Banks (SSGB) Atlantic halibut stock, yet large knowledge gaps remain about diversity of migratory and spawning behaviors. Here, 71 pop-up satellite archival tags were deployed on large Atlantic halibut (FL: 87–166 cm) between 2012 and 2020. Migration tracks were successfully reconstructed for 43 fish using a hidden Markov geolocation model, and temperature and depth time series were available for an additional nine fish (total n = 52). Five migratory behavior categories were identified: shelf residency, slope residency, shelf-channel migration, shelf-slope migration, and dispersal. High-resolution data for four of 20 physically recovered tags provided evidence of putative spawning behavior in deep channels on the continental shelf and along the continental slope between January and February. Additionally, four halibut displayed previously undocumented periods of sustained, oscillatory vertical movements along the continental slope between November and February. The high migratory diversity observed in this study provides support for the existence of multiple resident and migratory contingents in the SSGB stock in the apparent absence of significant genetic structure.

Funder

Conseil Territorial

Oceans Frontier Institute

Natural Sciences and Engineering Research Council of Canada

Fisheries and Oceans Canada

Préfecture de Saint-Pierre-et-Miquelon

Publisher

Canadian Science Publishing

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