Tiger shark (Tiger) gets its name from the dark body color with vertical lines especially in the tiger shark was young. The more mature, the color of vertical lines are thinned out or even disappear altogether.
Predators with a blunt nose is big and famous for its reputation as an eating / attacking humans. The biggest problem with these sharks is, they do not discriminate which type of menu they will eat. When they attack people and make the first bite, they are likely to continue to attack. Unlike most of the white shark man left after the first bite.
Shark species often eat carrion, has the sense of sight and smell very good, almost no restriction on the type of prey they eat. Tiger sharks have sharp teeth and jagged with a very strong jaws, so as to solve a large shell and even a sea turtle shell. A Tiger Shark who had been arrested, found in the stomach remaining stingrays, sea snakes, seals, birds, squid and even a plate and a motor vehicle tires.
Tiger shark known as a trash can, because very often these sharks will eat anything that met, such as floating garbage, old tires and others. Tiger sharks live in tropical marine regions and sub-tropical in the world. The size of this shark can grow from 3 to 4.5 meters and weigh more than 600 kg.
Tiger sharks are often hunted by fishermen to be taken fins, skin, meat and heart that contain high levels of vitamin A which can be processed into oil vitamin A. Amount of their current existence is threatened.
Regional distribution of Tiger Shark (brown color):
Type: Fish (Fish)
Type of food: Carnivore
The average life span: up to 50 years
Size m 3:25 to 4:25
Weight: 385 to 635 kg
Relative size of the human 2m:
Senin, 12 Oktober 2009
hiu putih
In the human imagination, the story of the Great White Shark (Latin: Carcharodon carcharias, Great White Shark) is a very scary, when in fact it is not as dramatic. Along with the often did research on these predatory animals, the White shark image as a merciless killing machine began to slowly fade.
Based on the facts, an over 100 shark attacks in the world, 1 / 3 or 1 / 2 of the number of attacks carried out by a white shark. However, almost all of these attacks is not too fatal. Recent research reveals that white sharks are animals that naturally has properties 'curious' that large, when I saw people swimming in the sea, the white shark is often 'just' will try to do a bite and then release it back often with no human prey itself. Although these facts are not something that comforts us, but based on these studies indicate that human bukahlah menu for the white shark.
White shark is the largest predator on earth, had an average body length of about 4.6 meters. The size of the largest white shark ever found was 6 meters long with a weight of 2.268 kg.
Filled white shark gray on the upper body to disguise himself with the seabed. White shark gets its name based on white color that surrounds the lower abdomen. White shark has a very ideal body shapes (streamlined), able to swim at about 24 km / h like a torpedo. White sharks can even jump to the top surface of the water by breaking into top like a whale when attacking their prey from under the water.
White shark is a predator who can adapt well, their mouths consists of 3000 triangular-shaped teeth like a saw that is formed in a few lines. Having a keen sense of smell to detect the presence of prey from a distance of several kilometers. Even white sharks have an organ that can sense weak electromagnetic vibrations produced by other animals. White shark can detect a drop of blood in 100 liters of sea water even within 5 miles more. The main prey of white sharks are sea lions, seals, small Whale species, turtles and even carrion.
White sharks are found in cold waters and coastal waters throughout the world. There is no clear record of the population of white sharks. The researchers argue, their populations growing number declines with shark fishing activities and sometimes accidentally caught in nets big ship but also by several other factors. White shark is listed as endangered species.
Brown areas on the spread of merupakah White Shark
Facts about Great White Sharks:
Type: Fish (Fish)
Type of food: Carnivore
Size: 4.6 - 6 meters more
Weight: 2.268 kg or more
Status: Endangered
Based on the facts, an over 100 shark attacks in the world, 1 / 3 or 1 / 2 of the number of attacks carried out by a white shark. However, almost all of these attacks is not too fatal. Recent research reveals that white sharks are animals that naturally has properties 'curious' that large, when I saw people swimming in the sea, the white shark is often 'just' will try to do a bite and then release it back often with no human prey itself. Although these facts are not something that comforts us, but based on these studies indicate that human bukahlah menu for the white shark.
White shark is the largest predator on earth, had an average body length of about 4.6 meters. The size of the largest white shark ever found was 6 meters long with a weight of 2.268 kg.
Filled white shark gray on the upper body to disguise himself with the seabed. White shark gets its name based on white color that surrounds the lower abdomen. White shark has a very ideal body shapes (streamlined), able to swim at about 24 km / h like a torpedo. White sharks can even jump to the top surface of the water by breaking into top like a whale when attacking their prey from under the water.
White shark is a predator who can adapt well, their mouths consists of 3000 triangular-shaped teeth like a saw that is formed in a few lines. Having a keen sense of smell to detect the presence of prey from a distance of several kilometers. Even white sharks have an organ that can sense weak electromagnetic vibrations produced by other animals. White shark can detect a drop of blood in 100 liters of sea water even within 5 miles more. The main prey of white sharks are sea lions, seals, small Whale species, turtles and even carrion.
White sharks are found in cold waters and coastal waters throughout the world. There is no clear record of the population of white sharks. The researchers argue, their populations growing number declines with shark fishing activities and sometimes accidentally caught in nets big ship but also by several other factors. White shark is listed as endangered species.
Brown areas on the spread of merupakah White Shark
Facts about Great White Sharks:
Type: Fish (Fish)
Type of food: Carnivore
Size: 4.6 - 6 meters more
Weight: 2.268 kg or more
Status: Endangered
Hiu paus
Hiu paus
Dari Wikipedia bahasa Indonesia, ensiklopedia bebas
| ?Hiu paus | ||||||||||||||||
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 Hiu paus dari Taiwan di Akuarium Georgia  Perbandingan besar dengan manusia | ||||||||||||||||
| Status konservasi | ||||||||||||||||
| Klasifikasi ilmiah | ||||||||||||||||
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| Nama binomial | ||||||||||||||||
| Rhincodon typus (Smith, 1828) | ||||||||||||||||
 Habitat hiu paus |
Hiu paus, Rhincodon typus, adalah hiu pemakan plankton yang meruapakan spesies ikan terbesar. Hiu ini adalah satu-satunya anggota dari genusnya Rhincodon dan familinya, Rhincodontidae (disebut Rhinodontes sebelum tahun 1984), yang masuk kedalam subkelas Elasmobranchii pada kelas Chondrichthyes. Hiu ini dapat ditemui di samudera tropis dan hangat dan hidup di laut. Spesies ini dipercaya berasal sekitar 60 juta tahun yang lalu.[2]
[sunting] Catatan kaki
- ^ Norman, Brad (2000). Rhincodon typus. 2006 IUCN Red List of Threatened Species. IUCN 2006. Diakses 11 May 2006. Database entry includes justification for why this species is vulnerable.
- ^ Jurassic Shark (2000) documentary by Jacinth O'Donnell; broadcast on Discovery Channel, August 5, 2006
Hammerhead shark
Hammerhead shark
From Wikipedia, the free encyclopedia
| Hammerhead sharks Fossil range: Middle Miocene to Present[1] | ||||||||||||||
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| Scientific classification | ||||||||||||||
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The hammerhead sharks are a group of sharks in the family Sphyrnidae, so named for the unusual and distinctive structure of their heads, which are flattened and laterally extended into a "hammer" shape called a "cephalofoil". Most hammerhead species are placed in the genus Sphyrna; some authorities place the winghead shark in its own genus, Eusphyra. Many, not necessarily mutually exclusive, functions have been proposed for the cephalofoil, including sensory reception, maneuvering, and prey manipulation. Hammerheads are found worldwide in warmer waters along coastlines and continental shelves.
Contents[hide] |
[edit] Physical description
The nine known species of hammerhead range from 0.9 to 6 m (3.0 to 20 ft) long. All the species have a projection on each side of the head that gives it a resemblance to a flattened hammer. The shark's eyes and nostrils are at the tips of the extensions.
The hammer shape of the head was thought to help sharks find food, aiding in close-quarters maneuverability and allowing the shark to turn sharply without losing stability. However, it was found that the unusual structure of its vertebrae allowed it to make the turns correctly, more than its head. But as the hammer would also shift and provide lift; hammerheads are one of the most negatively buoyant of sharks. Like all sharks, hammerheads have electroreceptory sensory pores called ampullae of Lorenzini. By distributing the receptors over a wider area, hammerheads can sweep for prey more effectively.[2] These sharks have been able to detect an electrical signal of half a billionth of a volt. The hammer also allows the nostrils to be placed further apart, increasing its ability to detect chemical gradients and localize the source.
Hammerheads have disproportionately small mouths and seem to do a lot of bottom-hunting. They are also known to form schools during the day, sometimes in groups of over 100. In the evening, like other sharks, they become solitary hunters.
Hammerheads are notably one of the few animals that acquire a tan from prolonged exposure to sunlight, a feature shared by pigs and humans. Tanning occurs when a hammerhead is in shallow waters or close to the surface for long periods.[citation needed]
Senin, 05 Oktober 2009
shark
Grey reef shark (Carcharhinus amblyrhynchos)
Sharks (superorder Selachimorpha) are a type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 420 million years ago, before the time of the dinosaurs.[1]
Since that time, sharks have diversified into 440 species, ranging in size from the small dwarf lanternshark, Etmopterus perryi, a deep sea species of only 17 centimetres (7 in) in length, to the whale shark, Rhincodon typus, the largest fish, which reaches approximately 12 metres (39 ft) and which feeds only on plankton, squid, and small fish through filter feeding. Sharks are found in all seas and are common down to depths of 2,000 metres (6,600 ft), and some live even deeper but they are almost entirely absent below 3,000 metres (9,800 ft). They generally do not live in freshwater, with a few exceptions such as the bull shark and the river shark which can live both in seawater and freshwater.[2] They respire with the use of five to seven gill slits. Sharks have a covering of dermal denticles that protect their skin from damage and parasites and improve fluid dynamics so the shark can move faster. They have several sets of replaceable teeth.[3]
Well-known species such as the great white and the hammerhead are apex predators at the top of the underwater food chain. Their extraordinary skills as predators fascinate and frighten us, even as their survival is under serious threat from fishing and other human activities.
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Etymology
Until the 16th century,[4] sharks were known to mariners as "sea dogs".[5] According to the OED the name "shark" first came into use after Sir John Hawkins' sailors exhibited one in London in 1569 and used the word to refer to the large sharks of the Caribbean Sea, and later as a general term for all sharks. It has also been suggested to be derived from the Yucatec Maya word for shark, xok, pronounced [?o?k].[6]
Physical characteristics
Main article: Physical characteristics of sharks
Skeleton
Shark skeletons are very different from those of bony fish and terrestrial vertebrates. Sharks and other cartilaginous fish (skates and rays) have skeletons made from cartilage and connective tissue. Cartilage is flexible and durable, yet has about half the density of bone. This reduces the skeleton’s weight, saving energy.[7] Sharks have no rib cage and therefore on land a shark's own weight can literally crush it.[8]
Jaw
Like its relatives, rays and skates, the shark's jaw is not attached to the cranium. The jaw's surface, like the shark's vertebrae and gill arches, needs extra support due to its heavier exposure to physical stress and its need for strength. It has a layer of tiny hexagonal plates called "tesserae", which are crystal blocks of calcium salts arranged as a mosaic.[9] This gives these areas much of the same strength found in the real bony tissue found in other animals.
Generally there is only one layer of tesserae in sharks, but the jaws of large specimens, such as the bull shark, tiger shark, and the great white shark, have two to three layers or more, depending on body size. The jaws of a large white shark may have up to five layers.[7] In the rostrum (snout), the cartilage can be spongy and flexible to absorb the power of impacts
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