Data from this catch category cannot be split into individual species and, as a consequence, it is difficult to determine how much of this catch consists of Graceful Sharks (C. amblyrhynchoides), although this level is likely to be low [Harry et al. 2013]. In the context of Australian fisheries, the Blacktip Shark species complex, part of the family Carcharhinidae (whaler sharks), comprises three species: Carcharhinus tilstoni (Australian Blacktip Shark), C. limbatus (Common Blacktip Shark) and C. sorrah (Spottail Shark).

At present, catch reported in the ‘Blacktip Whaler Shark’ category cannot be differentiated into individual species. Australia’s waters contain at least 322 species of chondrichthyan fishes, including sharks (182 species), rays (125 species) and chimaeras (15 species) (Simpfendorfer et al. 0000028321 00000 n

This assessment combines Australian Blacktip Shark, Common Blacktip Shark and Spot-Tail Shark. This situation is expected to improve through time with the introduction of a new Shark and Ray logbook into the Gulf of Carpentaria on 1 January 2018, which limits the ‘Blacktip Whaler’ category to C. limbatus and C. tilstoni only and lists Graceful sharks (C. amblyrhynchoides) and Spottail shark (C. sorrah) individually. In Australian waters, genetic studies have identified two biological stocks of C. tilstoni (a western stock extending from the western Northern Territory into northern Western Australia, and an eastern stock extending from the Gulf of Carpentaria to the east coast of Queensland and New South Wales), three biological stocks of C. limbatus (one across Western Australia and the Northern Territory, one in the Gulf of Carpentaria, and one on the east coast of Queensland and New South Wales) and a single biological stock of C. sorrah across northern Australia [Ovenden et al. Blacktip Sharks are found along Australia’s northern coastline. 94 0 obj <>stream %PDF-1.4 %���� Marine Ecology Progress Series, 488: 221–232.

Conservation Genetics, 13: 455–463. 0000033163 00000 n

Blacktip Sharks biology [Harry et al.

An estimated 38–125 t was reported from the GOCIFFF each year for the period 2007–17 under the ‘Blacktip Whaler Shark’ catch category that includes Graceful Sharks (C. amblyrhynchoides).
0000034994 00000 n 2017]. 0000004452 00000 n h�b```f``�f`e`��cb@ !6 ��q`�FI���H��}��a�.���*A�,W#>�20u� C�j`` s��������W ���`�P~�S>l���1�0U��q)�P+(|�}�Iqi� #�a�ec���0+6,``If0ќ��}���]�L_ iF �b>��VA��. The inability to assign more multispecies catch records to Blacktip Shark species makes it difficult to identify catch and effort trends for this species complex.

The catch of Blacktip Sharks in the New South Wales Shark Meshing Program is negligible, at less than 1 t. Collectively, these figures indicate that the overall catch of this species in New South Wales waters is insignificant in terms of impacting the East Coast stock.

The stock assessment report, however, acknowledged that there are a number of data limitations for Queensland fisheries, particularly with respect to the species identifications and the quantity and reliability of available catch data.
Click the links below to view reports from other years for this fish.

Ryan K, Hall N, Lai E, Smallwood C, Taylor S, Wise B. 0000019045 00000 n The stock in QLD’s Gulf of Carpentaria is undefined. 2012, Harry AV 2011, Last and Stevens 2009].

However, significant use of catch reporting categories 'Unspecified Sharks' (5–204 t) and 'Unspecified Whaler Sharks' (7–26 t) during that period suggest that these historical quantities are most probably underestimates. On the basis of the evidence provided above, the East Coast multispecies biological stock is classified as a sustainable stock.

Sources of Seafood Knowledge – from the Fisheries Research and Development Corporation, for information on fisheries research and development, looking for a fish?

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