A Cambodian fisherman has called for the largest freshwater fish ever recorded in the Mekong, according to scientists, a giant 300-kilo ray.
Named Boramy – “full moon” in the Khmer language – because of its shape, the four-meter-long female was released after receiving an electronic implant to monitor her movements and behavior.
Captured in Stung Treng province in northern Cambodia, it weighed more than twice the weight of an average lowland gorilla, the scientists said.
“In 20 years of research (…), this is the largest freshwater fish that we have encountered or that has been documented in the whole world”, a statement Tuesday in a press release Zeb Hogan, director of Wonders of the Mekong, a US-funded conservation project.
“This is an absolutely stunning discovery that justifies efforts to better understand the mysteries surrounding the giant freshwater stingray,” he added.
Threatened by overfishing, pollution and habitat loss, the species is protected.
Boramy broke the record for a 293kg giant catfish that was won in 2005 a little further upstream in northern Thailand.
The Mekong, one of the longest rivers in Asia (4,350 kilometers long), is home to the most important aquatic biodiversity in the world after the Amazon, with more than 1,000 species of fish.
Gigantic specimens such as the giant catfish or the giant barbel which can reach three meters and weigh up to 300 kilos also inhabit its waters.
The river, which reaches 80 meters deep in places, could harbor even larger varieties, according to scientists.
Vital to the survival of millions of people in Southeast Asia, the Mekong and its wildlife are threatened by dozens of dams built by Beijing in China, Laos and Cambodia.
Pollution is another source of concern.
Plastic waste has been spotted even in the deepest areas of the river as well as “ghost nets” lost or abandoned by fishermen in which fish can become trapped.