A local fisherman in northeast Cambodia has caught the world’s largest freshwater fish, a 300kg (661lbs) female stingray. The colossal catch was found in the Mekong River, near Koh Preah in Stung Treng province. Nicknamed Boramy, or full moon, the stingray measures 3.96 metres (13ft) long. Biologists said the discovery is a “sign of hope” that freshwater fish, which are considered “threatened with extinction”, could still thrive despite growing environmental pressures.