Deep-sea movement patterns of the Patagonian toothfish Dissostichus eleginoides Smitt in the Southwest Atlantic
Brendon Lee
A B * , Frane Skeljo A , Haseeb S. Randhawa A C D E and Alexander Arkhipkin A
+ Author Affiliations
- Author Affiliations
A Fisheries Department, Falkland Islands Government, Stanley, PO Box 598, FIQQ 1ZZ, Falkland Islands.
B Department of Ichthyology and Fisheries Science, Rhodes University, PO Box 94, Grahamstown 6140, South Africa.
C Faculty of Life and Environmental Sciences, University of Iceland, Sturlugata 7, 102 Reykjavik, Iceland.
D South Atlantic Environmental Research Institute, Stanley Cottage, Stanley, FIQQ 1ZZ, Falkland Islands.
E New Brunswick Museum, 277 Douglas Avenue, Saint John, NB, E2K 1E5, Canada.
* Correspondence to: blee@naturalresources.gov.fk, brendon82.lee@gmail.com
Handling Editor: Michael Kingsford
Marine and Freshwater Research 73(6) 833-845 https://doi.org/10.1071/MF21338
Submitted: 30 November 2021 Accepted: 11 March 2022 Published: 4 May 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing.
Abstract
Context: Knowledge on movement patterns within marine fish populations are essential for understanding key aspects of their biology, distribution and stock structure. Many deep-sea fish species possess complex life-history patterns with distributions occurring across vast areas. The nature of connectivity at different life-history stages in a dynamic Patagonian toothfish population on the Patagonian Shelf, Slope and deep-sea plateau around the Falkland Islands remains speculative.
Aims: We aimed to elucidate the movement patterns as well as the extent that these are driving connectivity during the adult life-history stages of Patagonian toothfish in the region.
Methods: A 5+-year tag–recapture program was executed and data were analysed using generalised additive models.
Key results: The majority of individuals (77.59%) displayed high site fidelity (<50 km), suggesting that seasonal spawning migrations are uncommon. However, 9.91% of individuals undertook large-distance movements across oceanographic and physical boundaries. These were characterised by large (>120 cm) fish inhabiting the slope and deep-sea plains (north of 52°S) undertaking southward (direction = 150–240°) home-range relocations to spawning areas.
Conclusions and implications: The results provide compelling evidence to a single Patagonian toothfish metapopulation, with important considerations in terms of the spawning stock dynamics, and the development of regional management agreements across their Patagonian distribution.
Keywords: connectivity, deep-sea, fisheries management, movement, recapture, site fidelity, southwest Atlantic, tagging.
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