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Partial female migration and cool-water migration pathways in an overfished shark


McMillan, MN and Huveneers, C and Semmens, JM and Gillanders, BM, Partial female migration and cool-water migration pathways in an overfished shark, ICES Journal of Marine Science, 76, (4) pp. 1083-1093. ISSN 1054-3139 (2019) [Refereed Article]

Copyright Statement

International Council for the Exploration of the Sea 2018. All rights reserved.

DOI: doi:10.1093/icesjms/fsy181


Knowledge about reproductive movements can be of important conservation value for over-exploited species that are vulnerable when moving between and within key reproductive habitats. Lack of knowledge persists around such movements in the overfished school shark Galeorhinus galeus in Australia. Management assumes all pregnant females migrate between adult aggregations in the Great Australian Bight, South Australia, and nursery areas around Bass Strait and Tasmania. We tracked 14 late-term pregnant females tagged in South Australia using satellite-linked pop-up archival tags to investigate extent, timing, and routes of migrations. We found partial migration, with some females (n = 7) remaining near aggregating areas throughout the pupping season, some migrating to known nursery areas (n = 3), and one migrating ∼3 000 km to New Zealand. We conclude female movements and pupping habitats are less spatially constrained than assumed and propose females use cool-water routes along the shelf break to reduce energy costs of migration. Migrating females using these routes faced greater fishing pressure than sharks in inshore areas and were not protected by inshore shark fishing closures designed to protect them. This study demonstrates the complexity of reproductive movements that can occur in wide-ranging species and highlights the value of explicit movement data.

Item Details

Item Type:Refereed Article
Keywords:behavioural plasticity, bioenergetics, fishing pressure, Galeorhinus galeus, large-scale movements, PSAT, soupfin shark, tope
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fisheries management
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Fisheries - wild caught not elsewhere classified
UTAS Author:Semmens, JM (Professor Jayson Semmens)
ID Code:131129
Year Published:2019 (online first 2018)
Web of Science® Times Cited:10
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2019-03-04
Last Modified:2022-09-05

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