Pregnant sharks have a gestation period of 8-10 months, and eventually give birth to between 20 and 50 soft pups of approximately seven inches in length and with round heads. Here are some of best sellings […] There are over 400 different species of sharks and over 8 species of hammerheads have been recognized so far. The expected life span of the great hammerhead is 20 to 30 years of age.  In Australia's other northern jurisdictions (the Northern Territory and Western Australia) recreational targeting and catching of Great hammerheads is allowed.. Viviparity means that the eggs hatch inside the female’s body and the babies are fed by a placenta which transfers nourishment from the mother via an umbilical cord connected to the pup between the pectoral fins. Min width. Despite its great size, as well as the reputation of most sharks, the powerful creature remains relatively harmless. Entanglement in shark nets around Australian and South African beaches is another source of mortality. 4 days ago. Great Hammerhead Shark Facts. Feeding of Great hammerheads occurs within the Bahama Islands - helping generate over $100 Million of tourism income each year and ensuring sharks are protected in the waters around the islands.  The litter size ranges from 6–55 pups, with 20–40 being typical. Size. There are 9 known species of Hammerhead Sharks and their size ranges from 0.9 to 6 meters (3 to 20 feet) in length.  The heaviest known great hammerhead is a 4.4 m (14 ft) long, 580 kg (1,280 lb) female caught off Boca Grande, Florida in 2006. Great Hammerhead Shark (Sphyrna mokarran) 20 feet / 6.1 m. The great hammerhead is the largest species of hammerhead. Great Hammerheads are the largest species of hammerhead in the world. Unlike most other sharks, which mate on or near the sea bottom, great hammerheads have been observed mating near the surface. Most sharks are intermediate in size, about the same size as people, 5-7 feet (1.5-2.1 m) long. Concern has arisen there over a substantial increase in illegal, unreported, and unregulated (IUU) fishing, reflecting the rising value of this shark's fins. The great hammerhead catch rate in Indian Ocean has declined 73% from 1978 to 2003, though it is yet undetermined whether these represent localized or widespread depletion. These large sharks average about over 500 pounds (230 kg) but can weigh as much as 1,000 pounds (450 kg). The technique is thought to save ~10% in drag and consequently movement costs. Great hammerhead sharks, Sphyrna mokarran (Rüppell, 1837), can easily be confused with the smooth hammerhead, Sphyrna zygaena (Linnaeus, 1758), because of their similar size. See hammerhead shark stock video clips. Will the sharks show up? size This is the largest of the hammerhead sharks. The great hammerhead is one of the largest predatory sharks but the reported maximum length of 620cm remains unverified. It is distinguished from its close relatives by its extremely long dorsal fin and its maximum size of 6.1 meters. Great hammerhead sharks also have a faster growth rate than the other hammerhead species and therefore reach maturity earlier, between 5 and 9 years old. This species has a viviparous mode of reproduction, bearing litters of up to 55 pups every two years. There are nine species of hammerhead sharks worldwide in the family Sphyyrnidae. Click here or below to download hands-on marine science activities for kids. Hammerhead sharks have never been involved in a fatal incident. The Great Hammerhead Shark is the largest of all hammerhead shark species : the maximum total size ever recorded is reported as 610 cm, though 350 to 400 cm is more common for a mature adult. Adult great hammerheads can be distinguished from the scalloped hammerhead and the smooth hammerhead by the shape of the cephalofoil, which has a nearly straight front margin (as opposed to arched), with prominent medial and lateral indentations. Assessment of its conservation status is difficult as few fisheries separate the great hammerhead from other hammerheads in their reported catches. It is found all along the rim of the Indian Ocean, and in the Pacific Ocean from the Ryukyu Islands to Australia, New Caledonia, and French Polynesia, and from southern Baja California to Peru. 4. Great hammerhead sharks are believed to be cannibalistic, eating their own species if need be.  However, there have been reports of great hammerheads approaching divers closely and even charging them when they first enter the water. SIZE The average great hammerhead shark is up to 11.5 feet (3.5 m) long. It sometimes behaves inquisitively toward divers and should be treated with respect. When it comes to the […] Trska; Sand cat hides leftovers of food in the sand!  However, for many years the valid scientific name for the great hammerhead was thought to be Sphyrna tudes, which was coined in 1822 by Achille Valenciennes. In one account from the Bahamas, a mating pair ascended while swimming around each other, mating when they reached the surface.  The young measure 50–70 cm (19.5–27.5 in) at birth; males reach maturity at 2.3–2.8 m (7.5–9.2 ft) long and 51 kg (112 lb) and the females at 2.5–3.0 m (8.2–9.8 ft) and 41 kg (90 lb). Trending. The longest recorded great hammerhead shark was 6.1 m (20 ft.) in length. The great hammerhead shark is the largest of all hammerhead species, reaching a maximum known length of 20 feet (6.1 m)1 and weight of 991 pounds (450 kg).2 The species is distinguished from other hammerheads by its nearly straight hammer-shaped head (cephalofoil) that has a prominent indentation in the middle. Hammerhead sharks are also threatened by culling through lethal shark control programs. Males mature at 234-269cm. Sharks range in size from the largest fish on the planet to the length of your palm. Overfishing of this shark species is the principle hazard to its long-term survival, with this occurring in many areas where these animals are found. Viviparous sharks give birth to live young.  Females breed once every two years, giving birth from late spring to summer in the Northern Hemisphere and from December to January in Australian waters. Although all three result in roughly the same damage, it greatly effects both their prey and the type of reso… ... 4,158 hammerhead shark stock photos, vectors, and illustrations are available royalty-free. Top Searches Holiday Gifts. The great hammerhead shark is the largest of all hammerhead species, reaching a maximum known length of 20 feet (6.1 m) 1 and weight of 991 pounds (450 kg). 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