Carcharhinus tilstoni Juvenile
picture by
McAuley, R.
Australia country information
Common names:
Australian blacktip shark, Blacktip shark, Blacktip shark
Occurrence:
endemic
Salinity:
brackish
Abundance:
abundant (always seen in some numbers)
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Ref:
Importance:
minor commercial
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Ref: Compagno, L.J.V. and V.H. Niem, 1998
Aquaculture:
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Ref:
Regulations:
restricted
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Ref:
Uses:
live export: yes;
Comments:
Occurs on the continental shelf of tropical Australia from about Exmouth Gulf to Gladstone in southern Queensland. Based on tagging and electrophoretic studies, there is only one stock of blacktip sharks in Australian waters (Ref. 26278).
Commercial fishery: Since the early 1970s, blacktip sharks together with other shark species have been fished off in northern Australia. The Taiwanese gillnetters have been in huge operations until mid-1986 when limitations on gillnet length were introduced. Due to uneconomic yields, the Taiwanese gillnet fishery ceased operations within the Australian Fishing Zone. At about the same time, an Australian gillnet and a drifting longline fishery was in operations in Napier Broome Bay and eastern Gulf of Carpentaria. This is a relatively small fishery with a catch of about 500 t and is marketed in south-eastern Australia as 'flake'.
Recreational fishery: Game fishers mostly from off Queensland usually catch small sharks of up to 2 m and 60 kg weight. Berley trail, heavy handlines with wire, and rod-and-reel are used for catching larger species. Other methods include trolling using lures and fish baits.
Resource status: Stocks were overexploited based on the assessments of the Taiwanese catch and effort data in 1986 (Ref. 26279). From 1980-84, sustainable catch for the offshore shark fishery would have been about 2400 t live weight (Ref. 26274). Since 1986, sustainable catch estimates have improved after fishing effort declined. The inshore northern region is probably only lightly exploited. No estimate is available on the impact of the catches by the demersal otter trawl fisheries on this resource. The Taiwanese and Indonesian gillnetting vessels continue to operate outside the Australian Fishing Zone to the north. Off the east coast of Queensland, the status of the whaler shark populations is not known. Also Ref. 2334, 9997.
National Checklist:
Country Information:
https://www.cia.gov/library/publications/resources/the-world-factbook/geos/as.html
National Fisheries Authority:
http://www.csiro.au/
Occurrences:
OccurrencesPoint map
Main Ref:
Kailola, P.J., M.J. Williams, P.C. Stewart, R.E. Reichelt, A. McNee and C. Grieve, 1993
National Database:
Elasmobranchii (sharks and rays) > Carcharhiniformes (Ground sharks) > Carcharhinidae (Requiem sharks)
Etymology: Carcharhinus:karcharos (Gr.), sharp or jagged; rhinus, an ancient name for sharks, from rhine (Gr.), rasp, both words alluding to a shark's jagged, rasp-like skin. (See ETYFish); tilstoni:In honor of Richard Tilston, naturalist-surgeon at Port Essignton, Northern Territory, near where holotype was collected in the 1840s. (See ETYFish). More on author: Whitley.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; brackish; pelagic-neritic; depth range 0 - 150 m (Ref. 6871). Tropical; 10°S - 28°S
Distribution
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