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Scalloped Hammer
Scalloped Hammerhead

Class

Fish

Species

Shark

The Scalloped Hammerhead Sphyrna lewini is a species of hammerhead shark, family Sphyrnidae. Originally Zygaena lewini, it was later moved to its current name. The Greek word sphyrna translates into "hammer" in English, referring to the shape of this shark's head. This shark is also known as the bronze, kidney-headed, or southern hammerhead.

DescriptionEdit

The most distinguishing characteristic of this shark, as in all hammerheads, is the 'hammer' on its head. The shark's eyes and nostrils are at the tips of the extensions. This is a fairly large hammerhead, though is smaller than both the Great and Smooth Hammerheads. On average, males measure 1.5 to 1.8 m (4.9 to 5.9 ft) and weigh approximately 29 kg (64 lb) when they attain sexual maturity, whereas the larger females measure 2.5 m (8.2 ft) and weigh 80 kg (180 lb) on average at sexual maturity. The maximum length of the scalloped hammerhead is 4.3 m (14 ft) and the maximum weight 152.4 kg (336 lb), per Fish Base. A female caught off of Miami was found to have measured 3.26 m (10.7 ft) and reportedly weighed 200 kg (440 lb), though was in a gravid state at that point.

HabitatEdit

The scalloped hammerhead is a coastal pelagic species, it occurs over continental and insular shelves and in nearby deeper water. It is found in warm temperate and tropical waters, worldwide from 46° north to 36° south. During the day they are more often found close to shore and at night they hunt further offshore.

BehaviorEdit

This shark is often seen during the day in big schools, sometimes numbering hundreds. They are not considered dangerous and are normally not aggressive towards humans.

FoodEdit

This shark feeds primarily on fish such as sardines, mackerel and herring, and occasionally on cephalopods such as squid and octopus. Larger specimens may also feed on smaller species of shark such as the blacktip reef shark, Carcharhinus melanopterus.

RelatedEdit

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