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In this photo provided by Wonders of the Mekong taken on June 14, 2022, a man touches a giant freshwater stingray before being released back into the Mekong River in the northeastern province of Stung Treng, Cambodia. A local fisherman caught the 661-pound (300-kilogram) stingray, which set the record for the world's largest known freshwater fish and earned him a $600 reward. (Chhut Chheana/Wonders of the Mekong via AP)

In this photo provided by Wonders of the Mekong taken on June 14, 2022, a man touches a giant freshwater stingray before being released back into the Mekong River in the northeastern province of Stung Treng, Cambodia. A local fisherman caught the 661-pound (300-kilogram) stingray, which set the record for the world's largest known freshwater fish and earned him a $600 reward. (Chhut Chheana/Wonders of the Mekong via AP)

In this photo provided by FISHBIO taken on June 14, 2022, a team of Cambodian and American scientists and researchers, along with Fisheries Administration officials measure the length of a giant freshwater stingray from snout to tail before being released back into the Mekong River in the northeastern province of Stung Treng, Cambodia. A local fisherman caught the 661-pound (300-kilogram) stingray, which set the record for the world's largest known freshwater fish and earned him a $600 reward. (Sinsamout Ounboundisane/FISHBIO via AP)

In this photo provided by FISHBIO taken on June 14, 2022, a team of Cambodian and American scientists and researchers, along with Fisheries Administration officials measure the length of a giant freshwater stingray from snout to tail before being released back into the Mekong River in the northeastern province of Stung Treng, Cambodia. A local fisherman caught the 661-pound (300-kilogram) stingray, which set the record for the world's largest known freshwater fish and earned him a $600 reward. (Sinsamout Ounboundisane/FISHBIO via AP)

In this photo provided by Wonders of the Mekong taken on June 14, 2022, a team of Cambodian and American scientists and researchers, along with Fisheries Administration officials prepare to release a giant freshwater stingray back into the Mekong River in the northeastern province of Stung Treng, Cambodia. A local fisherman caught the 661-pound (300-kilogram) stingray, which set the record for the world's largest known freshwater fish and earned him a $600 reward. (Chhut Chheana/Wonders of the Mekong via AP)

In this photo provided by Wonders of the Mekong taken on June 14, 2022, a team of Cambodian and American scientists and researchers, along with Fisheries Administration officials prepare to release a giant freshwater stingray back into the Mekong River in the northeastern province of Stung Treng, Cambodia. A local fisherman caught the 661-pound (300-kilogram) stingray, which set the record for the world's largest known freshwater fish and earned him a $600 reward. (Chhut Chheana/Wonders of the Mekong via AP)

In this photo provided by Wonders of the Mekong taken on June 14, 2022, a team of Cambodian and American scientists and researchers, along with Fisheries Administration officials prepare to release a giant freshwater stingray back into the Mekong River in the northeastern province of Stung Treng, Cambodia. A local fisherman caught the 661-pound (300-kilogram) stingray, which set the record for the world's largest known freshwater fish and earned him a $600 reward. (Chhut Chheana/Wonders of the Mekong via AP)

In this photo provided by Wonders of the Mekong taken on June 14, 2022, a team of Cambodian and American scientists and researchers, along with Fisheries Administration officials prepare to release a giant freshwater stingray back into the Mekong River in the northeastern province of Stung Treng, Cambodia. A local fisherman caught the 661-pound (300-kilogram) stingray, which set the record for the world's largest known freshwater fish and earned him a $600 reward. (Chhut Chheana/Wonders of the Mekong via AP)

In this photo provided by FISHBIO taken on June 14, 2022, village residents watch as a team of Cambodian and American scientists and researchers, along with Fisheries Administration officials prepare to release a giant freshwater stingray back into the Mekong River in the northeastern province of Stung Treng, Cambodia. A local fisherman caught the 661-pound (300-kilogram) stingray, which set the record for the world's largest known freshwater fish and earned him a $600 reward. (Sinsamout Ounboundisane/FISHBIO via AP)

In this photo provided by FISHBIO taken on June 14, 2022, village residents watch as a team of Cambodian and American scientists and researchers, along with Fisheries Administration officials prepare to release a giant freshwater stingray back into the Mekong River in the northeastern province of Stung Treng, Cambodia. A local fisherman caught the 661-pound (300-kilogram) stingray, which set the record for the world's largest known freshwater fish and earned him a $600 reward. (Sinsamout Ounboundisane/FISHBIO via AP)