In all of marine life there are few species of fish that are considered amongst the most dangerous. And amongst them are the sharks. Though they are dreaded and feared, yet marine biologists take risks to find all the possible information about sharks some of which are given here :
- On a yearly basis the great white sharks can grow up to about 10 inches.
- The length of a full-grown great white shark can go up to 12 to 14 feet in length.
- The shark’s teeth are replaced on a weekly basis. More precisely a new set of teeth replaces the old every 8 days.
- There are certain shark species that shed and replace as many as 30,000 teeth during their entire lifespan.
- The whale sharks have about 300 rows of teeth. Each row consists of hundreds of tiny teeth.
- In the past dried sharkskin was used as sandpaper.
- A shark’s average lifespan is 25 years. However there are some that live up to 100 years.
- The dogfish are so named, as their mannerisms underwater are similar to dogs on earth.
- The great white sharks can survive for as long as three months with no food.
- Not all shark species need to constantly move in order to breathe. They can breathe when they are steady underwater.
- The bull sharks can tolerate any amount of salt content in the water and are also found in the freshwater rivers and lakes of Africa and South America.
- The pygmy shark grows to a maximum length of 11 inches.
- The shark’s skeleton is not made of bones, but cartilage.
- Marine biologists have recorded and listed 340 shark species.
- The first shark fossil ever found dates its existence back to over 400 million years.
- The prime difference between the ancient and modern shark is in its jaw. The latter have a jaw that provides them more biting force.
- The shark’s skin is completely embedded with dermal denticles. These resemble teeth.