Sharks

The research base on sharks habit:
Shark is found mostly in temperate seas throughout the world's oceans. It makes infrequent visits to cold waters and has been recorded off Alaska and Canada.

Great whites can be found along the coastlines of South Africa, Australia, New Zealand, California to Alaska, the east coast of USA and the Gulf coast, Hawaii, most of South America, the Mediterranean Sea, West Africa to Scandinavia, Japan and the eastern coastline of China and southern Russia.
The white shark lives mainly in the upper part of the water column, near the shore. However, it ranges from the surf line to well offshore and from the surface and to depths of over 250m.This shark commonly patrols small coastal islands inhabited by pinnipeds ,offshore reefs, banks and rocky headlands where there is deepwater close to shore. The white shark usually cruises either just off the bottom or near the surface.

Movement

Although information about the white shark's movements is limited by its rarity, some information has been gathered through tag-and-release programs in the United States, South Africa and Australia. These studies reveal that the white shark is capable of making movements on localised, regional and intercontinental scales. Generally, larger individuals undertake long journeys across the great oceans.
The great white is also capable of short, high-speed pursuits and even launching itself clear from the water (breaching). They are propelled through the water by their powerful tails, and they use their fins for balance. Sharks swim constantly, otherwise they will sink as they don't have a buoyant swim bladder like other fish.


my reflection:
After, I done the research base on sharks, I had understand and learned many things, people always thought that sharks are cruel and fear, however, this is not true.We got this opinion from some movies and story books,but not much people know that sharks actually is a kine of animal which very important to the ocean.Sharks help to control the population of animals in ocean,sharks will ear up the animal which had a great amount of population.
Many people fear sharks,because they through sharks will attack human,or even take human as their food,however, this was not true.Shark only attack other kind animal when they were hungry or they felt danger come from those kind of animals,so when we if found sharks near us when we in the sea, do not attack them or chest them away, the best way was to swim away quietly and when shark attacking you, the best way was use your hand and arm protect your head and quickly swim away.