Friday, May 15, 2015

5 Most Dangerous Sharks in The World

5. Grey Reef Shark

This specie was discovered by a Dutch ichthyologist Pieter Bleeker who first described the grey reef shark in 1856 as Carcharias (Prionodon) amblyrhynchos, in the scientific journal Natuurkundig Tijdschrift voor Nederlandsch-Indi?. Due to some misinterpretations of the grey reef sharks characteristics, Bleeker first named it Carcharias, but later on it was corrected to Carcharhinus. Grey reef shark (Carcharhinus amblyrhynchos) is the least deadly on this list, due to its size, which ranges from 6 ft (1.8 m) to 8 ft (2.4 m).
Grey reef shark 1

The main reason for this type of shark to be on the list of most dangerous sharks is its habitat, which is how this kind got its name, the coral reefs in the Indian ocean, as well as the Pacific, meaning that they often come across humans, as well as thirteen to fourteen rows of teeth which make this specie a force to be reckoned with.
Grey reef shark2

Their diet mainly consists of bony fish, as well as cephalopods, such as squids and octopuses, even though they are well known for their encounters with humans, especially with spearfishers since they are drawn by the fish blood which is spilled during fishing via spears.

4. Hammerhead Shark

The hammerhead sharks are a group of sharks which belong to the family of Sphyrnidae, named after the unusual and distinctive shape of their heads, which are flattened and stretched into a “hammer” shape called a “cephalofoil”. Their size varies from 3 ft to 19 ft (0.9 m to 6 m).
Hammerhead 2

These sharks are found worldwide on coastlines of almost all of the oceans, as well as what are known as “continental shelves”, which are the parts of the oceans where continental tiles are connected and form shallow, warm water seas.
Hammerhead Shark 2

Their rather odd physiological characteristic enables these sharks an incredible 360 degree vision, while also enabling them to see above themselves as well as below, also their shape allows for much faster turns without losing stability. They also have an interesting social behavior, seen as they go about in swarms during the day, and become individual predators in the night. In the year 2013, there have been 33 reported attacks of these sharks. Out Of the entirety of their species, which counts up to eleven types of the hammerhead, three can be dangerous to humans: the scalloped, great, and smooth hammerheads.But for their lack of aggression, they remain at the fourth place on the list of the most dangerous sharks.

3. Tiger shark

The tiger shark, (Galeocerdo cuvier), is a type of requiem shark and the only member of the genus Galeocerdo. Known also as sea tiger, the tiger shark is a large macropredator, capable of achieving a length of over 5 m (16 ft), second only to the great white.
Tiger Shark

It`s habitat are most often tropical and temperate waters, and is also a pretty often sight around the islands in the Pacific ocean.
Tiger shark 2

This kind of sharks are solitary nocturnal hunters. Excellent eyesight, the ability to trace faint traces of blood and tracking low wave frequency make it an exceptionally efficient predator.The name of the species derived from their patterns which resemble stripes found on a tiger, which tend to fade as the shark matures. Versatility of their diet, as well as tendency to swallow inedible human-made objects gave these sharks the nickname “garbage can of the sea”. As for their diet, it includes pretty much anything that these vicious predators find in their way, such as: crustaceans, fish, squid, turtles, sea snakes, birds, and even seals and dolphins. These sharks are also very dangerous for their tendency to visit harbors, reefs, and water canals, in addition to their slow swimming, and camouflage. Their bad reputation has made this specie endangered due to fishing. Also tiger sharks are responsible for a large portion of lethal attacks on humans, which finally gave them the well deserved third place on the top five most dangerous sharks list.

2.  The Great White Shark

The great white shark (Carcharodon carcharias) is the largest on this list, with leinght of staggering 21 ft (6.4 m), although there were several reports on great whites of even 26 ft (8 m) and weighing above 3 tonnes.
great white shark 1

This giant lamniform shark is found along the coastlines of all major oceans with greater concentrations in the waters near USA, south Africa, Japan, Oceania and the Mediterranean.
great white shark 2

This colossal shark is also considered to be an apex predator, meaning it has no natural predators. Great white sharks eat pretty much anything that comes their way, including fish, seabirds, as well as other other sharks, and are known to be scavengers. They are also responsible for the second largest number of unprovoked attacks on humans when it comes to sharks. Bestselling novel “Jaws” by Peter Benchley and also blockbuster film with the same title gave them the reputation of having appetite for humans, even though in reality, humans are not their preferred diet.
One of the more important characteristics of these sea predators is that they have a unique system of thermoregulation called “rete mirabile” (Latin for “wonderful net”), which is a net-like structure of veins and arteries that enables them to keep their body heat rate above sea temperature (excluding heart and gills). In addition they have a special technique of attacking their prey by rotating when dealing bites. With their incredible features they still strike fear into the hearts of fishermen an seamen alike, which caused the downfall and are now considered to be a vulnerable specie under the protection by the CITES treaty.

1. Bull Shark

Holding the number one spot is the infamous bull shark. Simply, evolution made it the most dangerous kind of shark known to man.  They are usually solitary hunters, although hunting in pairs is not a rare sight. The bull shark’s diet consists mainly of bony fish and sharks, alternatively turtles, birds, dolphins, terrestrial mammals, crustaceans, echinoderms, and stingrays.
Bull Shark 022

They are found worldwide in warm, shallow seas as well as rivers. Though it may not be the biggest on the list of the most dangerous sharks (size goes up to 2.4 m or 7.9 ft) it has one crucial advantage over all the upper mentioned, and that is the ability to live in freshwater. That has, in fact, made them responsible for the largest number of fatal encounters with humans, as they can be found in almost all of the worlds largest river systems, such as the Amazon, Zambezi, Ganges, an so on.
Bull Shark

There are some records of these sharks being as much as 2000 miles up the stream of the Amazon, which is allowed by their technique of swimming upstream not unlike a salmon. They are known for their unpredictable temper, so they sometimes tend to even eat other bull sharks, even hippopotami, and the number of recorded fatal encounters with these predators is 82, while it is not known how many non-fatal attacks. And it is for obvious reasons the bull shark is the undisputed number one on the list of the most dangerous sharks.

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