Sabtu, 15 September 2012

Bull Shark


The Biggest Animals Kingdom and in The World | Bull Shark | The bull shark is commonly found worldwide in coastal areas of warm oceans, rivers and lakes, rivers and water occasionally salt and fresh if they are deep enough. Bull shark populations are also found in several major rivers, with more than 500 bull sharks thought to live in the Brisbane River. A large bull shark was caught in the canals of Scarborough, two hours north of the Gold Coast. You can live in water with a high salt content as in St. Lucia Estuary in South Africa. The bull shark is generally abundant in the warm waters and coastal estuaries of the Mozambique Channel and south, including Kwa-Zulu Natal and Mozambique. After Hurricane Katrina, many bull sharks were sighted in Lake Pontchartrain. Bull sharks sometimes ascended the Mississippi River as far upstream as Alton, Illinois.

Some breeds (Rajidae), smooth dogfish (Triakidae) and gray reef sharks (Carcharhinus plumbeus) regularly enter estuaries. Elasmobranchs capacity "to enter fresh water is limited because their blood is normally at least as salty (in terms of osmotic strength) as seawater, through the accumulation of urea and trimethylamine oxide, but bull sharks live in fresh water showed a significantly reduced concentration of urea in the blood Nevertheless, the composition of the solute (ie, osmolarity) of a bull shark in fresh water is much more higher than that of the external environment. Initially, scientists thought the sharks in Lake Nicaragua belonged to an endemic species, the Lake Nicaragua shark (Carcharhinus Nicaraguensis). 

A bull shark feeding consists mainly of bony fish and sharks, including other bull sharks, but can also include turtles, birds, dolphins, terrestrial mammals, crustaceans, echinoderms and races. Bull sharks have been known to use the bump and bite technique to attack their prey. Bull sharks are usually solitary hunters, but sometimes hunt in pairs. Often cruise the shallow waters. Since bull sharks often dwell in shallow waters, they may be more dangerous to humans than other species of sharks, and the tiger shark, oceanic whitetip shark and the great white shark, are among the four species of sharks most likely to attack humans. One or more bull sharks may have been responsible for the Jersey Shore shark attacks of the 1916, which was the inspiration for Peter Benchley Jaws news. Speculation of bull sharks may be liable based on a number of attacks that occur in brackish water and freshwater, and there are some similarities between bites bulls and great white sharks.

The bull shark is responsible for attacks across the inputs of Sydney Harbour. In India, the bull shark swimming along the Ganges River and have attacked people. Most of these attacks were attributed to shark Ganges Glyphis gangeticus, a species endangered river shark which is probably the only other shark in India, able to survive in fresh water, although the shark gray nurse was also charged during the sixties and seventies. Bull sharks mate in late summer and early autumn, often in the brackish water of river mouths. After 12 months of pregnancy, a bull shark may give birth to 4-10 live young.
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