“In 2020, one of the contenders for the world’s largest freshwater fish, known as the Chinese paddlefish, was declared extinct,” Hogan said. And many species of big fish are in danger of disappearing forever. He also hoped the discovery reminds the local community how special this river is and how much it’s in need of saving.īecause of a combination of factors, including dam construction, overfishing and climate change, big freshwater fish populations are generally in decline. While breaking the world record was not scientifically important, Hogan said that the existence of this fish is an indicator for the health of its ecosystem. North American and European river systems receive far more scientific attention. “So it’s a very unique place and very understudied,” he said. The area is also home to freshwater dolphins, giant soft-shell turtles, giant catfish and giant barb, which is in the carp family. With so many giant stingrays caught in recent months and all of them female, Hogan believes this stretch of the river and the deep pools it contains are a critical breeding ground for the species. In the months ahead, they plan to tag hundreds of additional fishes. ![]() “This is the first fish that we’ve tagged since having the array deployed,” said Hogan, who is also a research associate professor at the University of Nevada, Reno. In another first, Hogan’s team was able to fit the stingray with an acoustic tag to track the animal for up to one year with an array of 36 underwater receivers that were also recently installed in a stretch of the river. “This is a heavily populated region, and the river faces a ton of challenges, including lots of fishing.” “The fact that the world’s largest freshwater fish was caught in the Mekong is remarkable,” Hogan said. Two other enormous rays have also been caught this year. The discovery comes less than a month after another giant stingray - that one weighing 180kg - was caught and released nearby. Using a tarp, they hoisted the stingray out of the water and onto the scales to verify its weight. Team members rushed to the small river island, called Koh Preah, and lined up three industrial scales. ![]() ![]() More often, they wind up in the market as a source of cheap protein.įishers in Cambodia first alerted Hogan and his team at Wonders of the Mekong Project, which works to protect the Southeast Asian river’s aquatic diversity and is sponsored by the US Agency for International Development, that they had caught a stingray larger than anyone had ever seen. While this species of giant stingray has an extremely dangerous venomous barb that can reach 30cm in length, they are not usually a threat to humans. Hogan said he had previously established that freshwater fish as the largest ever caught. And at 300kg, it was 7kg heavier than a Mekong giant catfish caught in Thailand in 2005. The ray, hauled out of the murky waters of the Mekong River in Cambodia, measured four metres in length before it was returned to the river. On June 13, his team found it - a giant freshwater stingray, or Urogymnus polylepis. (Chhut Chheana via The New York Times)įor 17 years, Zeb Hogan, a biologist, has been searching for the world’s largest freshwater fish. In an undated image provided by Chhut Chheana, a Urogymnus polylepis, or giant stingray, was fished out of the Mekong River to be weighed and measured in Cambodia.
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