Of course, the idea to swim with the sharks may seem scary and unpleasant, nevertheless there are many interesting things you don’t know about them.
1. In the world there are about 500 species of sharks, which differ in size, shape, habitat, and nutrition.
2. As it has been already mentioned, the sharks come in different sizes. There are those that can fit in your hand, such as the pygmy shark and there is a shark, which can fit several people at once – for example, the whale shark, measuring up to 12 m in length.
3. There is a kind of angel shark-like rays (the shark family). The feature of saw shark – sharp nose, the which length can reach the size of the shark body.
4. Sharks are found at different depths – in the shallows, in estuaries, and at a depth of about 3000 m.
5. Deep goblin shark or the goblin shark is the oldest existing species among sharks. They belong to the white shark, thresher shark and isurus.
6. The first sharks appeared 400 or 455 million years ago, but modern sharks with flexible cartilage skeletons almost did not survive.
7. Petrified serrated scales, which once covered the body of a shark are the most ancient evidence of the appearance of the shark species.
8. Only a few things really make shark a shark. All sharks have a fresh jawbone and the number of gills, and, unlike most other fish species, sharks skeleton is cartilage rather than bone.
9. In contrast to the bony fish, sharks have no swim bladder. They use their large fatty liver for buoyancy.
10. Most of the sharks as well as other fish are cold-blooded, but some – warm-blooded, including the white shark.
11. Having a higher body temperature than the temperature of water makes these animals develop different velocity. They grow faster, swim faster and hunt more efficiently. In exchange, they have to eat 10 times more likely than other cold-blooded fellows of similar size.
12. Surprisingly, sharks do not become angry near food. They are relaxed and their eyes almost do not rotate.
13. In the movie “Jaws” stated that the lifeless black eyes when shark bites are white.
14. This is partly true. But only some species, including the white shark, use eye rotation to protect eyes. Others protect their eyesight by the third eyelid, called the nictitating membrane.
15. Many etymologists believe that the word ‘shark’ can be borrowed from the Dutch language. It was used to refer to dodgy people. This connection can still be seen in the phrase “shark business.”
16. Carcharocles megalodon is the longest form of a shark, the size of 15 m, which lived 2.6 million years ago.
17. There is a myth that sharks do not get cancer. This, of course, is not true. Reverse it became known in 1908, when the blue shark malignant tumor was discovered.
18. 100 million sharks are killed due to finning. The fishermen cut off the fins, sold as a delicacy, and a wounded animal thrown back into the ocean to die. It reduces the number of sharks and disrupted the food chain.