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Hammerhead sharks are overfished all around the world for their fins and liver oil. As of 2020 an estimated 1.3 to 2.7 million fins are collected each year from smooth and scalloped hammerhead sharks for the shark-fin trade. [34] DNA barcoding can assist in the identification of scalloped hammerhead remains to aid conservation efforts. [35]
Their heads have lateral projections that give them a hammer-like shape. While overall similar, this shape differs somewhat between species; examples are: a distinct T-shape in the great hammerhead, a rounded head with a central notch in the scalloped hammerhead, and an unnotched rounded head in the smooth hammerhead. [5]
The smooth hammerhead (Sphyrna zygaena) is a species of hammerhead shark, and part of the family Sphyrnidae.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 indentation in the middle of the front margin (hence "smooth").
The smooth hammerhead is the second biggest of the species. It derived its name from the glossy texture of its head, unlike its cousins, the great and scalloped hammerheads with notches on their ...
Adults 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. The width of the cephalofoil is 23–27% of the body length.
The smooth hammerhead is one of nine known species of hammerhead shark. It is considered "vulnerable" on the International Union for Conservation of Nature's list of threatened species.
Scalloped hammerhead: Sphyrna lewini: EN Tropical and subtropical coasts worldwide Carolina hammerhead: Sphyrna gilberti? western Atlantic Ocean Scoophead: Sphyrna media: DD California and northern South American coast Smalleye hammerhead: Sphyrna tudes: VU eastern South American coast Smooth hammerhead: Sphyrna zygaena: VU
The bonnethead (Sphyrna tiburo), also called a bonnet shark or shovelhead, [3] is a small member of the hammerhead shark genus Sphyrna, and part of the family Sphyrnidae.It is an abundant species in the littoral zone of the North Atlantic and the Gulf of Mexico, is the only shark species known to display sexual dimorphism in the morphology of the head, and is the only shark species known to be ...