The recent capture and release of six Mekong giant catfish in Cambodia has revived hopes for the survival of one of the world's largest and rarest freshwater species.  These critically endangered fish, capable of reaching up to 10 feet (3 meters) in length and weighing as much as 300 kilograms (661 pounds), were caught within five days along the Mekong River and its tributaries. The species, now limited to the Mekong River in Southeast Asia, once thrived along the entire 4,900-kilometer (3,044-mile) river, stretching from Vietnam to China's Yunnan province. However, their numbers have declined by 80% in recent decades due to overfishing, dam constructions, and other environmental disruptions.  The first two fish were caught on the Tonle Sap River near Phnom Penh and released after being tagged. Four more were captured on Tuesday, including two over two meters (6.5 feet) long, weighing 120 and 131 kilograms (264 and 288 pounds), respectively. Japan auctions fin whale meat first time in 50 years Experts believe the fish were migrating from floodplains near Tonle Sap Lake to spawning areas in northern Cambodia, Laos, or Thailand.  Dr Zeb Hogan, a research biologist from the University of Nevada Reno and leader of the Wonders of the Mekong project, described the discovery as a promising sign. “It’s a hopeful sign that the species is not in imminent, like in the next few years, risk of extinction, which gives conservation activities time to be implemented and to continue to bend the curve away from decline and toward recovery,” he said.  The Wonders of the Mekong project, in collaboration with Cambodia’s Fisheries Administration, has tagged and released around 100 giant catfish over two decades. This research provides valuable data on their migration patterns, habitats, and overall health.  Local communities play a vital role in conservation, reporting accidental catches to officials for tagging and release. “Their cooperation is essential for our research and conservation efforts,” said Heng Kong, director of Cambodia’s Inland Fisheries Research and Development Institute.  The Mekong River, home to several large species including the giant stingray, is a crucial resource for millions. Conservationists hope this discovery highlights the need to protect its unique ecosystem.