The largest freshwater fish ever recorded was captured in the Mekong River in Cambodia last week by a fisherman collaborating with researchers to document the river's biodiversity.The four-meter endangered giant freshwater stingray (Urogymnus polylepis) was hauled from the river on June 13 before being measured and released back into the wild, the non-profit conservation news service Mongabay reported.Weighing in at nearly 300 kilograms, the stingray surpasses the previous record holder, a 293-kg Mekong giant catfish (Pangasianodon gigas) caught in Thailand in 2005.Experts say the find emphasizes what's at stake in the Mekong, a river that's facing a slew of development threats, including major hydropower dams that have altered the river's natural flow and exacerbated low river levels due to dry-season droughts in recent years, Mongabay reported.This is an absolutely astonishing discovery, and justifies efforts to better understand the mysteries surrounding this species and the incredible stretch of river where it lives,& Zeb Hogan, a fish biologist and leader of the USAID-funded Wonders of the Mekong project, said in a statement.The post Giant stingray caught in Cambodia is world's largest freshwater fish first appeared on Ariana News.