hammerhead shark


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hammerhead shark,

active, surface-living shark, genus Sphyrina. Its curious head has lateral projections resembling the crossbar of a T, and its eyes and ears are located in the outer tips of the projections. This arrangement apparently gives the shark excellent binocular vision, and helps them see above, below, and behind as well as in front. It has been suggested that the extension of the head in the plane of the pectoral fins may give the fish increased lift, but there is no evidence that hammerheads are better swimmers than other sharks. Found in inshore, brackish water, hammerheads are both predators and scavengers. They feed on a variety of fishes including skates, rays, and other hammerheads, and large hammerheads have been known to attack and eat humans without provocation. The largest species is the widely distributed great hammerhead, Sphyrina mokarran, which typically reaches 15 ft (4.6 m) in length; the distance between its eyes may be as much as 3 ft (90 cm). The common hammerhead, S. zygaena, is found in all tropical waters, summering as far N as Newfoundland. It may reach a length of 12 ft (3.7 m). The bonnet, or shovelhead, shark is a small, harmless hammerhead found in the W Atlantic from Brazil to Massachusetts. It reaches a length of 5 ft (150 cm) and its lateral lobes are much shorter than in other species, giving the head a rounded appearance. There are several other species distributed throughout tropical and temperate oceans. Hammerhead sharks are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Chondrichthyes, order Selachii, family Sphyrnidae.
References in periodicals archive ?
Some of these shark species, such as bronze whaler (Carcharinus brachyurus), hammerhead shark (Sphyrna zygaena), and blue shark (Prionace glauca), are taken as bycatch in other fisheries but are prohibited as target species.
The massive hammerhead shark approximately weighed 700 pounds.
The great hammerhead shark is listed as endangered in the northwest Atlantic and Gulf of Mexico by the International Union for Conservation of Nature (ICUN) due to a suspected population decline of nearly 50 percent over the last 10 years.
Although we've known that a few million hammerhead shark fins are sold in global markets, we now have the DNA forensic tools to identify which specific hammerhead species the fins originate from, and in the case of scalloped hammerheads, also what parts of the world these fins are coming from," said Dr Mahmood Shivji, senior author on the paper and Director of the Save Our Seas Foundation Shark Centre and Guy Harvey Research Institute (GHRI), both at Nova Southeastern University in Florida.
A film crew aboard a Channel Seven News helicopter were the first to spot him and were horrified to realise that he was only 20 metres from a hammerhead shark that was circling him.
Dubai Fishermen may have struck gold this week when they landed a great hammerhead shark pregnant with a litter of 45 pups, but the Arabian Gulf's marine ecosystem took a great hit.
SILENT TREATMENT Dale Smith (Alex Walkinshaw) tries to get information from rape victim Jasmine Harris VICTIM Alison Shaughnessy BIZARRE Hammerhead shark CHILD-FRIENDLY Ian suggests Jane adopts Bobby in 'Enders
Though drawn out, the item with a Goby fish hiding from a circling Hammerhead shark, unaware that just by breathing it was giving off the electrical emanations that would reveal its hiding place had as much suspense as anything in Hitchcock.
If you are fishing down in the islands, an interesting alternative is a little hammerhead shark fishing.