The scalloped hammerhead (Sphyrna lewini) is a species of hammerhead shark. Male scalloped hammerhead sharks can grow to nearly 6 feet in length and weigh up to 64 pounds. Depending on their size, the females give birth to between 15 and 30 pups. Scalloped hammerhead sharks are moderately large sharks with a global distribution. The Scalloped Hammerhead Shark has a tapered shape, with light brown, bronze or olive colouring on the do… They sport sensing organs, called ampullae of Lorenzini, which help them find prey such as stingrays buried in sand and ocean floors. The most common type of hammerhead shark, it primarily lives in warm, temperate, and tropical coastal waters. The other hammerhead species are the Bonnethead, the Great Hammerhead, the Scalloped hammerhead, Carolina hammerhead, Scoophead shark, Smalleye hammerhead, Smooth hammerhead and the Whitefin hammerhead. Females are larger, growing to more than 8 feet and weighing 80 pounds. This has led to complete die off of populations in … It can be found down to depths of over 500 metres (1,600 ft) but is mostly found above 25 metres (82 ft). Let's find out and explore about hammerheads in Hammerhead Sharks Facts for kids! They are sensitive to light and because of their enhanced social behavior, these sharks are found closer to shore lines during the day and mostly remain in deep seas during the night. It can be found down to depths over 500 m (1,600 ft), but is most often found above 25 m (82 ft). by admin October 8, 2020. written by admin October 8, 2020. Scalloped hammerheads bear their young alive and have an egg yolk placenta. This includes the Caribbean Sea and the Gulf of Mexico. Pregnancy lasts between 9 and 10 months. They can grow up 14 feet and 300 pounds, with the width of the hammer being 25-30% of the length. Despite their large heads, they have relatively small mouths. This page was last modified on 30 November 2020, at 17:38. Like all hammerhead sharks, the scalloped hammerhead is an active predator and gains several advantages from the shape of its head. Scalloped hammerhead shark (Sphyrna lewini) feisty females fight for attention. Scalloped Hammerhead – Sphyrna lewini Also reaching up to 4 m this hammerhead has narrow blades and a notch in the centre and indentations resembling the … What are some of the most amazing facts about Hammerhead sharks?! Scalloped hammerheads usually grow to the length of 1.5 to 2.7 meters long, but the longest found was 4.3 meters long. It has also been known as Cestracion leeuwenii in 1865, Zygaena erythraea in 1871, Cestracion oceanica in 1913, and Sphyrna diplana in 1941. That is why it is important to learn more about their whereabouts and hikes. Depending on the species, gender and age, the length of this shark can vary from 3 feet to 20 feet. The Scalloped Hammerhead sometimes forms large migratory schools, dispersing at night to feed in deeper waters. Hammerhead sharks, which belong to the family Sphyrnidae, are some of the most unique looking critters from the sea. It was renamed Sphyrna lewini in 1834. Scalloped hammerhead sharks (Sphyrna Iewini) have a thick, wide head shaped like a double-headed hammer with its eyes and gills on the end. They feed on mackerel, herring, sardines, other fish, and cephalopods. In general, hammerheads aren't aggressive toward humans, although on rare occasions larger sharks have attacked people. Incidents with humans are rare. Scalloped Hammerhead Sharks – Facts and Conservation, 8601 Georgia Avenue, Suite 510, Silver Spring, MD 20910, NOAA-21st CCLC Watershed STEM Education Partnership Grants, Flower Garden Banks National Marine Sanctuary, Overutilization for commercial and recreational purposes, including fishing, The lack of adequate regulatory mechanisms to allow the exploitation to continue. Averaging about 10 feet (3 metres) in length for mature adults, their name is derived from the notches or "scallops" that appear along the front edge of the hammer. They are usually olive, bronze, light brown, grey-brown or even silver-grey in colour with a white belly. Scientific Name: Sphyrna lewini Family: Hammerhead Sharks - Sphyrnidae Adult Length: 4 - 6 m (13 - 19 ft) Size: 5 - 9 ft., max. The Scalloped Hammerhead is a coastal pelagic species and is found over continental and insular shelves and in nearby deeper water. The Greek word sphyrna translates into "hammer" in English, referring to the shape of this shark's head. This has led to complete die off of populations in certain areas (Maguire et al. Scalloped hammerhead shark (Sphyrna lewini) feisty females fight for attention. It is found in continental and insular shelves, and in nearby deeper water. The scalloped hammerhead shark (Sphyrna lewini) is listed as globally endangered on the IUCN’s Red List. Scalloped hammerhead sharks have became the first species of shark to be protected by the U.S. The scalloped hammerhead is commercially fished, in addition to being a sought after gamefish by sport anglers. This mechanism is possible only after the formation of the placenta when shark embryos are nourished directly from the mother’s bloodstream. Hammerhead fins h… They sometimes eat cephalopods like octopuses and squids. More than 100 scalloped hammerhead sharks congregate around islands. This large planarian lives on land and is both a predator and a cannibal. Habitat. Scalloped hammerhead sharks are not considered dangerous to people. Hammerhead sharks are an iconic species inhabiting Australia’s waters. Description. The scalloped hammerhead is commercially fished, in addition to being a sought after gamefish by sport anglers. It is found in Research has shown that in some parts of the Atlantic Ocean, populations have decreased by 95% in the last 30 years. Scalloped hammerhead use the sensors in their hammers (which are called cephalofoils) to detect … Feed mostly on bony fish, squid and occasionally sharks and rays. The shark's eyes and nostrils are placed on the ends of the cephalofoil. Map of where the Scalloped Hammerhead Shark is found (In blue). The side wings of the head are narrow with margins swept backward. It can be found down to depths over 500 m (1,600 ft), but is most often found above 25 m (82 ft). It was first known as zygaena lewini, but is now known as Sphyrna lewini. The largest have been known to grow to 14 feet in length. While the distinctive-looking worms don't pose a direct threat to human beings, they're an invasive species that packs the power to eradicate earthworms. To save our hammerheads, we must implement stronger levels of protection for them and reduce fishing pressure. The heaviest ever found weighed 150 kilograms. They feed on mackerel, herring, … They have also been known to eat other smaller species of sharks like the Blacktip reef shark, Carcharhinus melanopterus, and the Atlantic sharpnose shark, (Rhizoprionodon terraenovae). Gestation periods for scalloped hammerhead sharks last for approximately 12 months. The first dorsal fin is high and second dorsal and pelvic fins are low. Their bellies are white which allows them to blend into the ocean when viewed from the bottom and sneak up on their prey. The word Sphyrna is a Greek word meaning "hammer", which refers to the "hammer" or "cephalofoil" on its head. It is also known as the "bronze hammerhead", the "kidney-headed hammerhead", or the "southern hammerhead". Two distinct population segments of the scalloped hammerhead shark are listed as endangered and two are listed as threatened under the Endangered … The scalloped hammerhead was first known as Zygaena lewini. The scalloped hammerhead shark satisfies the criteria for inclusion in CITES Appendix II, and the great hammerhead shark and smooth hammerhead shark qualify for listing as look-alike species, in accordance with Annex 2b, criterion A of Resolution Conf. The scalloped hammerhead (Sphyrna lewini) is a species of hammerhead shark. The front of the head has an undulating margin with a central notch. They can range in weight from 3 to 550 kg. Family name: Sphyrna Order name: Carcharhiniformes Common name: Scalloped hammerhead shark Scientific name:Sphyrna lewini Averaging about 10 feet (3 metres) in length for mature adults, their name is derived from the notches or "scallops" that appear along the front edge of the hammer. A popular prey for the scalloped hammerhead shark is stingrays, despite the threat of barbs. The widely spaced eyes, nostrils, and other senses allow the scalloped hammerhead to more successfully locate its prey near, or buried in, the sea floor. Did you guys know that there are actually advantages for their head being shaped that way? Two more indentations flank the main one, giving them a scalloped appearance. They are also caught by sports fisherman and accidentally snared by fishing crews that are longline fishing, typically for tuna or swordfish. Also reaching up to 4 m this hammerhead has narrow blades and a notch in the centre and indentations resembling the shell of some scallops which give the shark its name. Hammerheads are usually gray-brown to olive-green on top. During the day, they stick close to shore and hunt offshore in the night. That is why it is important to learn more about their whereabouts and hikes. This species tendency to aggregate in large groups making capture in large numbers on longlines, bottom nets and trawls even easier. The Eastern Pacific and Eastern Atlantic DPS (Distinct Population Segment) populations of scalloped hammerhead sharks are listed as endangered under the Endangered Species Act. You can also submit written comments via the mail to “Office of Protected Resources,NMFS, 1315 East-West Highway, Silver Spring, MD 20910 or by fax to 301-713-4060 attn: Maggie Miller. FISH FACTS: Description The Scalloped Hammerhead is a large hammerhead shark. The Scalloped Hammerhead sometimes forms large migratory schools, dispersing at night to feed in deeper waters. Scalloped hammerhead sharks are also at risk in regions where the hammerheads are not hunted themselves because they often get caught in fishing nets. These are missing on other hammerheads. This problem, driven by the high economic value of its fins and the consumption of its meat, has led to the species being overfished during all stages of its lifecycle. Researchers are calling for a ban on Shark finning, which is when the fin's of sharks are cut off and the rest of the animal is thrown back into the water to die. Scalloped hammerhead sharks (Sphyrna Iewini) have a thick, wide head shaped like a double-headed hammer with its eyes and gills on the end. With the help of harpoons, scientists want to equip the sharks with transmitters. Diet. Another typical characteristic is the free end tip of the second dorsal fin which nearly reaches the tail fin. Compagno . It has a length of about 18 to 20 feet. Shark fins are heralded as a delicacy, such as a shark fin soup, in some parts of the world. These attacks could be caused from the great hammerhead shark. It is still considered a traditional dish in some places. The most distinguishing characteristic of this shark is it's "hammer-shaped" head. Their fins are made into shark fin soup. The Scalloped Hammerhead Shark has a tapered shape, with light brown, bronze or olive colouring on the dorsal surfaces, fading to white below. The first dorsal fin is high and second dorsal and pelvic fins are low. It refers to the shape of the shark's head. Here are five interesting facts about them: These large sharks grow over 3 metres long, making them one of the largest species of hammerheads in the world. While the Whitefin is an extremely unique creature, and is certainly as fascinating as its other hammerhead brethren, it turned out to be only slightly different from the already classified Scalloped Hammerhead Shark (S. lewini) in its morphology. Like all other hammerhead sharks, the scalloped hammerhead has a "hammer", which is known as the "cephalofoil", on its head. The most distinguishing characteristic of this shark is it's "hammer-shaped" head. The Magnet is actually a feeding ground for these hammerheads due to the seasonal schools of mobula rays which provide make easy prey for them in large numbers. Scalloped hammerheads feed on fish such as sardines, mackerel, and herring. Scalloped hammerhead (Sphyrna lewini) Scoophead (Sphyrna media) Smalleye hammerhead or golden hammerhead (Sphyrna tudes) Smooth hammerhead (Sphyrna zygaena) Whitefin hammerhead (Sphyrna couardi) Winghead shark (Eusphyra blochii) Some Interesting Facts about Hammerheads. During the day, they stick close to shore and hunt offshore in the night. On the West coast, you will find them from Southern California to Ecuador and even Peru in the eastern Pacific Ocean. Diet. Conservation Actions: Scalloped hammerhead sharks are listed on Appendix II of CITES meaning that all international trade of this species must be registered. On an average basis, the hammerhead shark ranges from 1m to 6m+, with the largest being the Great Hammerhead. Hammerhead sharks are consummate predators that use their oddly shaped heads to improve their ability to find prey. Scalloped hammerhead sharks are moderately large sharks with a global distribution. Hammerhead sharks are the most commonly caught sharks for finning. Family name: Sphyrna Order name: Carcharhiniformes Common name: Scalloped hammerhead shark Scientific name: Sphyrna lewini. Working together, we safeguard species and the places they call home and preserve America’s maritime resources. The Scalloped Hammerhead is a coastal pelagic species and is found over continental and insular shelves and in nearby deeper water. Although scalloped hammerheads are said to be harmless towards humans, there has been reports of attacks from this shark. The word Sphyrna is a Greek word meaning "hammer". Although the meat is sold, this species is also highly regarded for its fins and hides. During the daytime, they are usually found close to shore. It was first known as zygaena lewini, but is now known as Sphyrna lewini. Scalloped hammerhead sharks have quite a long gestation period of 10 to 11 months, giving plenty of time for the maternal supply of nutrients to influence the composition of vertebrae of the embryos while in utero. The side wings of the head are narrow with margins swept backward. Like all other hammerhead sharks, the scalloped hammerhead has a "hammer", which is known as the "cephalofoil", on its head.The shark's eyes and nostrils are placed on the ends of the cephalofoil. Cool facts. Scalloped hammerhead sharks are listed as Critically Endangered by the International Union for the Conservation of Nature and Natural Resources (IUCN). Like all other hammerhead sharks, the scalloped hammerhead has a "hammer", which is known as the "cephalofoil", on its head.The shark's eyes and nostrils are placed on the ends of the cephalofoil. Their eyes are placed at the sides of their head. The principal conservation problem facing this species is its population decline. The reason for this is because of over-fishing for shark fins. Scalloped hammerhead sharks are listed as Critically Endangered by the International Union for the Conservation of Nature and Natural Resources (IUCN). It is found in warm temperate and tropical coastal waters all around the world, between latitudes 46° north and 36° south. Habitat. Scalloped Hammerhead: NSW, QLD, NT, WA; Smooth Hammerhead: NSW, VIC, TAS, SA, WA . They … Scalloped Hammerhead Shark Fact Sheet. It is readily accessible to inshore fishers as well as offshore commercial operations. More than 100 scalloped hammerhead sharks congregate around islands. But they are under threat, and in some cases even critically endangered. Sharks can detect weak electrical fields using electrical sense organs called the ampullae of Lorenzini. These are connected to the exterior via pores in the shark's snout. According to the International Union for Conservation of Nature, the Great and Scalloped are listed as endangered and the smalleye hammerhead is listed as vulnerable. CoP15). Hammerhead sharks are consummate predators that use their oddly shaped heads to improve their ability to find prey. Hammerhead sharks can be found in warm waters worldwide. Though many sharks are solitary creatures, scalloped hammerheads—which can reach lengths of 10 to 12 feet and can weigh in at 300 pounds or … Females are larger, growing to more than 8 feet and weighing 80 pounds. The scalloped hammerhead is a coastal pelagic species. The Scalloped Hammerhead Shark can be distinguished by their large flattened 'hammer-like' head, with wide set eyes and prominent central scallop-like indentation in the front margin of the head. In the petition to get the species protected under the Endangered Species Act, three specific threats were cited: Regulations have helped protect the population, but the sharks are still at risk from commercial fisheries who prize their oil, meat, and skin. In general, hammerheads aren't aggressive toward humans, although on rare occasions larger sharks have attacked people. Learn more about the Marine Mammal Protection Act and how it protects marine species. With the help of harpoons, scientists want to equip the sharks with transmitters. FISH FACTS: Description The Scalloped Hammerhead is a large hammerhead shark. It is a rare, little-known species of hammerhead shark. The edges of the fins are usually darker on the young, but as they grow older they become more lighter. (It's possible that these sharks are a separate species, the great hammerhead, Sphyrna mokarran.) They are large sharks, but smaller than Great Hammerheads. CoP15). Scalloped hammerhead sharks are also at risk in regions where the hammerheads are not hunted themselves because they often get caught in fishing nets. These are missing on other hammerheads. Fast Facts: Hammerhead Worm In the Atlantic Ocean, they have been found from New Jersey and southward all the way to Brazil. Conservation Actions: Scalloped hammerhead sharks are listed on Appendix II of CITES meaning that all international trade of this species must be registered.
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