Saturday, September 3, 2011

Life of Great White Shark

Life of Sea | Great White Shark (Carcharodon carcharias) | This animal is also known as the Great white, White pointer, White shark, or White death. In the film, is portrayed as very ferocious sharks and hunting and killing humans. The depiction is too excessive. In fact, these fish are endangered due to human activity. Great white sharks can be found in almost all coastal and offshore waters throughout the world. They used to live in sea water at temperatures between 12 and 24 ° C. Great white sharks normally live in surface waters down to depths of 1280 meters. In America, Great white sharks can be found on the coastline of California to Alaska, the east coast of the United States, the Gulf coast, Hawaii and South America. They are also found in South Africa, Australia (except the north coast), New Zealand, the Mediterranean Sea, West Africa to Scandinavia, and Japan to the east coast of China to Russia. 
Scientific classification
Kingdom:     Animalia
Phylum:     Chordata
Class:     Chondrichthyes
Subclass:     Elasmobranchii
Order:     Lamniformes
Family:     Lamnidae
Genus:     Carcharodon, A. Smith, 1838
Species:     C. carcharias

Great white sharks have big and strong body. The body is torpedo-shaped where the snout is rather long and conical. They has a strong keel on the tail peduncle, but no secondary keel. The white part of their body is only at the bottom. The top of the shark is varied, ranging from gray brownish gray to black. Great white sharks have serrated and almost triangle teeth. The largest white shark ever found was more than 18 meters in length or 6 feet, weighing 2.268 kg. But. the average length body is about 4.6 meters.  Great white sharks are carnivorous. So, for food, they eat various marine species. They can eat many kinds of fish such as salmon, hake, halibut, mackerel and tuna. In addition, beside eating  small and medium fish, they also eat marine mammals like dolphins, harbor seals and sea turtles. Therefore, they become the largest predatory  in the world.
Great white sharks are well-adapted predators. They have sharp sense of smell to detect  the prey from several kilometers distance. Even they have an organ that can sense weak electromagnetic vibrations generated another animal. Great white sharks can detect a single drop of blood in 100 liters of sea water within a distance of 5 kilometers or more. One thing that is very special for a predator. The scientists explained that sharks have an amazing arrangement of teeth. The mouth consists of 3000 resemble triangular serrated teeth that formed in a few lines. The upper teeth have larger size. The bottom teeth are more slender. When they lose their teeth due to catching preys or eating habits, it will soon be replaced with new teeth in about one or two days.
Needed to know that from more than 100 shark attacks around the world, a third or a half of the number of attacks were caused by Great white sharks. But, it should be emphasized that almost all attacks did not give serious effects. Recent studies shows that the Great white sharks have  great curiosity when they saw human is swimming in the sea. They are often just trying to do a bite and then release it. They will not prey on human. Despite the fact this is not good news at all, this study shows us that Great white sharks are not regard humans as their prey or their food.
Naturally, the decline in Great white sharks populations are influenced by the ability of female Great white sharks to lay eggs. The female will lay two eggs in their lifetime. Surely, this greatly affects the amount of their population. However, this is not the main factor. Excessive fishing is a major factor. They are caught mainly for meat. In some cases, intentionally they are caught using large boat or they are trapped in nets. Looking the fact, the shark is not dangerous to humans, but humans are harmful to the Great white sharks. As a result of overfishing, they are currently listed as an endangered species.

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3 komentar

Hugo Costa January 23, 2013 at 6:11 PM
This comment has been removed by the author.
Hugo Costa January 24, 2013 at 7:23 PM

I guys,

Check the shark page at
http://skaphandrus.com
a comprehensive catalogue of marine species to sea lovers.

Aleksei Molodtcov May 8, 2016 at 2:23 PM

what do jellyfish eat

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