The biggest freshwater fish ever recorded was a 300-Kilogram stingray caught by a fisherman in Cambodia.

After being fitted with a tag to track its behavior, the giant freshwater stingray was caught and released back into the wild.

The previous record for biggest freshwater fish was held by a 616-pound giant catfish caught in Thailand in 2005.

The experts said the stingray was more than twice the weight of a lowland gorilla.

BREAKING: At 661 pounds, this giant freshwater stingray (Urogymnus polyepis) just dethroned the Mekong giant catfish to become the WORLD'S LARGEST FRESHWATER FISH!

Photo: Chea Seila / @mekongwonders pic.twitter.com/MDzQCfdzd6

— Jason Bittel (@bittelmethis) June 20, 2022

In 20 years of researching giant fish in rivers and lakes on six continents, this is the largest freshwater fish that we've encountered.

Efforts to understand the mysteries surrounding this species and the incredible stretch of river where it lives have been vindicated by this discovery.

Researchers fitted an acoustic tag to a stingray in order to learn more about its secretive behavior.

The giant freshwater stingray was caught by a fisherman in the same province.

The giant catfish and giant barb are not the only giants in the muddy waters, there are more than 1,000 fish species in the region.

"Boramy" the megafish.

Even in the deepest stretches of the Mekong, scientists warn that plastic waste is threatening wildlife.

60 million people are fed through the waterway, which starts in China and goes through parts of Thailand, Laotians, and Cambodia.

Environmentalists have been concerned about the destruction of fish stocks by the construction of the dam along the Mekong River.

Agence France- Presse.