Conventional tagging of sharks in Western Australia: the main commercial species exhibit contrasting movement patterns

Bartes, Saia, Simpfendorfer, Colin, Walker, Terence I., King, Carissa, Loneragan, Neil, and Braccini, Matías (2021) Conventional tagging of sharks in Western Australia: the main commercial species exhibit contrasting movement patterns. Marine and Freshwater Research, 72 (11).

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Abstract

Understanding movement patterns underlies effective management and conservation measures. The current study summarises the main findings from a tagging program of Western Australian sharks to provide insights into the movement patterns of the main commercial shark species: dusky (Carcharhinus obscurus), sandbar (C. plumbeus), gummy (Mustelus antarcticus) and whiskery (Furgaleus macki) sharks. Between 1993 and 2020, >12 000 individuals from 52 taxonomic groups were implanted with conventional tags in Western Australia, of which 8.5% were recaptured. Most of the tagged (74.5%) and recaptured (95.8%) individuals belong to the four main commercial shark species. Recaptured individuals of these species, as well as tiger (Galeocerdo cuvier) and bronze whaler (C. brachyurus) sharks showed displacements of >1000 km and rates of movement (ROMs) of >10 km day-1, with the exception of whiskery sharks, which showed much slower ROMs (<3 km day-1). Despite tagged dusky and sandbar sharks being predominately small individuals and gummy and whiskery sharks being large individuals, dusky and sandbar sharks had faster ROMs and a greater proportion of recaptures outside the release zone. Our study provided the information required for estimating movement rates across different fishing zones and therefore defining the spatial scale for managing these shark species.

Item ID: 70656
Item Type: Article (Research - C1)
ISSN: 1448-6059
Keywords: conservation, fisheries management, migration, movement
Copyright Information: © CSIRO 2021
Date Deposited: 11 Nov 2021 01:40
FoR Codes: 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3005 Fisheries sciences > 300502 Aquaculture and fisheries stock assessment @ 30%
31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 40%
41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410406 Natural resource management @ 30%
SEO Codes: 10 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 1003 Fisheries - wild caught > 100305 Wild caught fin fish (excl. tuna) @ 70%
18 ENVIRONMENTAL MANAGEMENT > 1805 Marine systems and management > 180502 Assessment and management of pelagic marine ecosystems @ 30%
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