SMOOTH HAMMERHEAD Sphyrna zygaena SIZE. The smooth hammerhead (Sphyrna zygaena) is a species of hammerhead shark, and part of the family Sphyrnidae. In recent years there has been a surge of published studies on this group of sharks, incorporating new information on age and growth, behavior, and the threats they face. Hammerhead Sharks are known for their distinctive head shape that looks like a hammer.

To about 13 ft (4 m).

Hammerhead sharks are among the most intriguing yet imperiled groups of large sharks globally. Population. warranted (80 FR 48053). To save our hammerheads, we must implement stronger levels of protection for them and reduce fishing pressure. But they are under threat, and in some cases even critically endangered. Other species, including the bull, dusky and smooth hammerhead sharks, may have declined by more than 99 percent. They have a wide cephalofoil with a straight and smooth front edge while in other species this hammer is not as smooth and may have a curved front margin.

The great hammerhead is the largest of the nine identified species of this shark. Of the 9 species found worldwide, seven of them have been evaluated by the IUCN Red List. DISTINGUISHING CHARACTERISTICS. “They’re all down dramatically,” said study co … The Great Hammerhead Shark (Sphyrna mokarran) has been listed as a Vulnerable Species, and the Scalloped Hammerhead Shark (Sphyrna lewini) has been listed as an Endangered Species in NSW under the Fisheries Management Act 1994. Smooth Hammerhead: NSW, VIC, TAS, SA, WA . The samples were obtained from artisanal fisheries from 2008 to 2013 to analyse cohorts, growth, mortality, abundance and recruitment, using methods based on length and relative age, and an inference multi‐model. Hammerhead sharks are an iconic species inhabiting Australia’s waters. Richer data on the fisheries' social-ecological dynamics are necessary to understand fishery impacts and the ban's efficacy. The smooth hammerhead shark is one of the larger hammerhead species, reaching average lengths of 8 to 11.5 feet (2.5 to 3.5 m) and a maximum length 16.4 feet (5 m) and weight of 880 pounds (400 kg).
This species is named smooth hammerhead because of the distinctive shape of the head, which is flattened and laterally extended into a hammer shape (called the cephalofoil), without an indent Whitefin hammerhead (Sphyrna couardi) – Unevaluated; Carolina hammerhead (Sphyrna gilberti) – Unevaluated

Until recently, our understanding of their biology, movements, diet, and life histories was challenged by a lack of studies. 1 Smooth hammerhead sharks mate via internal fertilization and give birth to live young.
The smooth hammerhead shark is a …

Great hammerheads have a set of well-evolved fins that allow the massive fish to navigate swiftly in the … This report summarizes the best available data and information on the species and presents an evaluation of its status and extinction risk. They can measure up to 20 feet and weigh a thousand pounds!" "Great hammerheads are the largest of all hammerhead species.

The Smooth Hammerhead Shark (Sphyrna zygaena) is not currently listed as a threatened or protected species in NSW. This study provides information on the population dynamics of the smooth hammerhead shark Sphyrna zygaena in the central‐southeast Pacific Ocean. It is due to this unique appearance which makes them interesting and create curiosity among the young minds. Status of the Hammerhead Shark. The Great Hammerhead (Sphyrna mokarran) is listed as Endangered with a decreasing population. Head broadly arched and hammer-shaped, lacking indentation at midline ("smooth") Pelvic fins with straight to slightly concave rear margins; Color deep olive to brownish-gray above, shading to white below This report is the status review for the smooth hammerhead shark. About Hammerhead Sharks In 2016, international protection of vulnerable smooth hammerhead sharks (Sphyrna zygaena) resulted in a seasonal fishing ban to protect juvenile sharks in Peru's small-scale fisheries.