邊幾種鯊魚瀕臨絕種?why?[急!!][10分]

Endangered Shark Species
1. Ganges shark
2. Borneo shark
3. Basking shark - North Pacific & Northeast Atlantic sub-populations
4. Speartooth shark
5. Whitefin Topeshark
6. Angular Angel shark - Brazilian sub-population
7. Smoothback Angel shark
8. Spinner shark - Northwest Atlantic sub-population
9. Pondicherry shark
10. Smoothtooth Blacktip
11. Blacktip shark - Northwest Atlantic sub-population
12. Dusky shark - Northwest Atlantic & Gulf of Mexico sub-populations
13. Grey Nurse shark (aka Sand Tiger)
14. Great White shark
15. Gulper shark
16. Basking shark
17. School shark (aka Tope shark)
18. Bluegray Carpetshark
19. Porbeagle shark
20. Whale shark


This is mainly due to overfishing. The recent rise in prices on shark fins on the Chinese market for use in shark fin soup, has made the situation very bad for sharks.
Even in marine national parks and sanktuaries there is a huge illegal fishery. It is very hard to enforce the regulations out at sea, and in many areas in the third world corruption is very big. Just look at the situation around Galapagos and Cocos island in the Pacific right now.

Sharks has a very slow reproduktive rate and are not capable of coping with a large long lasting fishery. If we don't find a way to regulate and inforce regulations the perspectives are very grim for these top predators.
You yourself should as a small help to the troubled sharks avoid buying shark produkts as sharkfin soup, shark steaks, shark jaws and shark cartilagineous tablets (they have no proven effect) etc.
Also you can spread out the knowledge of these animals to avoid unnescesary fear. Shark attacks are extremely rare when you take into consideration how many people all over the world are using the sea every day swimming, diving and surfing.