Many species of shark are facing a serious threat to their existence because of worldwide fishing trends, environmentalists said Wednesday.
Fishermen "used to cut the lines and let sharks go," said Pete Kinghts, executive director of WildAid, a San Francisco-based conservation group, told a shark conservation conference. In recent years, however, fishermen have kept the sharks to sell their lucrative fins.
One-third of the more than 500 shark species are threatened with extinction or are close to being threatened, said Sarah Fowler of the World Conservation Union.