Cambodian fishermen on the Mekong River got a shock when they inadvertently hooked an endangered giant freshwater stingray four meters long and weighing 180 kilos, scientists said on Wednesday. The female leviathan, one of Southeast Asia's largest and rarest species of fish, was caught by accident last week in Stung Treng province when it swallowed a smaller fish that had taken a baited hook. An international team of experts on the US-funded Wonders of the Mekong project worked with th