Monday, May 3, 2010

How are Sharks Different From Other Fish?

Sharks are unique in several different ways:

1. They are made up entirely of cartilage which makes establishing a fossil history of these fish impossible.

2. Their skin is covered with denticles, which are tooth-like projections from the skin instead of scales.

3. They have no swim bladder. A very oily liver also provides buoyancy
to compensate for the lack of a swim bladder.

4. The jaw of a shark can be unhinged to open very wide while feeding. They also can
have as many as 8 rows of teeth.

5. Whenever a shark loses a tooth, another one moves up to take its
place. A shark can go through up to 2,400 teeth a year.


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