Sabtu, 15 September 2012

Zebra Shark


The Biggest Animals Kingdom and in The World | Zebra Shark | The zebra shark occurs in the tropical waters of the Indo-Pacific, South Africa to the Red Sea and the Persian Gulf (including Madagascar and the Maldives), India and Southeast Asia (including Indonesia, the Philippines and Palau), north to Taiwan and Japan, east of New Caledonia and Tonga, and south to northern Australia. Adults and teenagers often large coral reefs, rubble and sand areas. Zebra sharks sometimes cross the sea to reach isolated seamounts. The displacements of up to 140 km (87 miles) were recorded for individual sharks. However, the genetic data indicate that there is little interaction between zebra shark populations, although their ranges are contiguous. The zebra shark has a cylindrical body with a broad head and snout short and blunt slightly flat.

There are 28-33 rows of teeth on the upper jaw and 22-32 rows of teeth on the lower jaw, each tooth has a large central cusp flanked by two smaller ones. The median dorsal ridge merges into the first dorsal placed midway along the body and twice the size of the second dorsal fin. The pectoral fins are large and broad pelvic and anal fins are much smaller, but larger than the second dorsal fin. The zebra shark reaches a length of 2.5 m (8.2 ft), with a database record 3.5 m (11.5 ft). The color pattern in young sharks is dark yellow, light brown above and below, with vertical stripes and yellow spots. Like the shark can reach 50-90 cm (20-35 inches) long, dark areas start to break, change the general pattern of stripes of light in the dark spots in dark light. The shark, a 1.9 m (6.2 ft) long mature female, was unusual in that albino animals rarely survive long in the wild due to their lack of camouflage

During the day, zebra sharks are slow and usually resting on the sea floor, sometimes using their pectoral fins to support the front of your body and face with his mouth open today to facilitate breathing. Zebra sharks are strong and agile swimmers, propelling themselves with pronounced eel (eel) undulations of the body and tail. The zebra shark feeds mainly on mollusks shell, but also crustaceans, small bony fishes, and possibly sea snakes body thin and flexible that sharks lets sneak into the holes and cracks reduce foraging, while its small mouth and oral cavity thick muscular force will create a powerful suction to draw prey This species can be eaten by larger fish and marine mammals. Parasites known zebra shark include four species of tapeworms in Pedibothrium gender.

Zebra sharks are usually solitary, although aggregations of 20-50 individuals were recorded. Off southeast Queensland, aggregations of several hundred zebra sharks form every summer in shallow water. This behavior resembles the pre-mating behavior among sharks, men and women, and in both cases, biting and holding the pectoral fin has been speculated to refer to a shark assert dominance over other docile and slow zebra sharks are not dangerous to humans and can be easily addressed underwater. Zebra sharks in many dive sites have become accustomed to human presence, taking food from the hands of divers and being touched. The zebra shark adapts well to captivity and shown by a number of public aquariums worldwide. The zebra shark is taken by commercial fishing in most of its range, with bottom trawls, gillnets and longlines.
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