Saturday 25 May
Giant guitarfish (Rhynchobatus djiddensis)
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Giant guitarfish fact file
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Giant guitarfish description
Its large, elongated, greyish-coloured body, two tall dorsal fins, and a large scythe-like tail give this fish its remarkable shark-like appearance (3) (4) (5). Large black eyespots occur at the base of each pectoral fin; there is a distinctive black cross between the eyes and the upper body is marked by rows of small white spots. The snout is pointed and the mouth is small, with flattened, pavement-like teeth (2).
- Also known as
- Whitespot guitarfish, whitespotted giant guitarfish, white-spotted guitarfish, whitespotted wedgefish. Top
- In the fishing industry, the part of the catch made up of non-target species.
- Dorsal fin
- The unpaired fin found on the back of the body of fish, or the raised structure on the back of most cetaceans.
- Method of reproduction whereby the egg shell is weakly formed and young hatch inside the female; they are nourished by their yolk sac and then ‘born’ live.
- Pectoral fins
- In fish, the pair of fins that are found one on each side of the body just behind the gills. They are generally used for balancing and braking.
IUCN Red List of Threatened Species (April, 2006)
FishBase (April, 2006)
Marine Themes (April, 2006)
Sundive: the marine life of Julian Rocks and Byron Bay (April, 2006)
Ministry of Natural Resources, Environment and Meteorology: Samoa’s Biodiversity (April, 2006)
ReefQuest Centre for Shark Research (April, 2006)
The Life and Times of Long Dead Sharks (April, 2006)
- Martin, R.A. (2006) Pers. comm.
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Giant guitarfish biology
Males mature at a length of around 156 centimetres, females at around 177 centimetres. Reproduction is ovoviviparous, and litters of between four and ten live young are usual. In South African waters, birth takes place in summer (7).Top
Giant guitarfish range
Widely distributed in the tropical Indo-west Pacific (6), ranging from South Africa to the Red Sea, and from Japan to New South Wales, Australia (7). However, this distribution is thought by many to in fact refer to several closely-related species that require taxonomic revision, with the true Rhynchobatus djiddensis thought to be confined to the Western Indian Ocean, and those ranging from the north-western Indian Ocean to the Western Pacific constituting separate species (1).Top
Giant guitarfish habitatTop
Giant guitarfish status
Classified as Vulnerable (VU) on the IUCN Red List. However, the publication of a taxonomic revision is pending (1).Top
Giant guitarfish threats
The fins of the giant guitarfish are among the most sought-after of any species in Asian markets - used for making shark-fin soup - and consequently there are concerns about over-fishing (1) (6). Its value makes this species an important fish to be directly targeted as well as retained as bycatch, and substantial declines in abundance have been recorded in Indonesian fisheries, and are also thought likely to be occurring elsewhere (1). Additionally, this unusual fish is highly prized by sport anglers in southern Africa for its size and powerful fight when hooked (7).Top
Giant guitarfish conservation
There are currently no conservation measures targeting this species. More research is certainly needed into current levels of harvesting and the direct impact this is having on population sizes (1).Top
Find out more
For further information on the conservation of sharks and rays see:Top
Authenticated (19/06/2006) by R. Aidan Martin, Director of the ReefQuest Centre for Shark Research.
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