為什麼shark會絕種(eng)

joycewong1997 您好 ~~~

The shark is becoming an extinct species due to the following reasons.

→ The water pollution that made by human beings makes the sharks to feel ill.

→ Some hunters may want them to make valuable things to sell and the number of sharks starts to be declining.

Some information from Wikipedia:

The majority of shark fisheries around the globe have little monitoring or management. The rise in demand for shark products increases pressure on fisheries. Stocks decline and collapse because it is difficult for sharks to breed rapidly enough to maintain population levels, given the long interval between birth and sexual maturity. Major declines in shark stocks have been recorded—some species have been depleted by over 90% over the past 20–30 years with a population decline of 70% not unusual. Many governments and the UNhave acknowledged the need for shark fisheries management, but little progress has been made due to their low economic value, the small volumes of products produced and sharks' poor public image.
Other threats include habitat alteration, damage and loss from coastal development, pollution and the impact of fisheries on the seabed and prey species. Shark finningattracts much controversy and regulations are being enacted to prevent it from occurring. The acclaimed 2007 documentary, Sharkwater exposed how sharks are being hunted to extinction.

For more information, please feel free to browse this website:
http://en.wikipedia.org/wiki/Shark#Conservation

希望可以幫到您 ~~~~~