A 300kg (661lb) stingray caught in the Mekong river in Cambodia is the biggest freshwater fish ever documented, scientists say. It unseated the previous record-holder, a 646lb (293kg) Mekong giant ...

Mature koi can produce 5,000 to 10,000 eggs and the largest koi can lay 500,000 eggs. “Introduced, non-native fish can spread deadly diseases to wild fish populations,” said Jeff Ziller ...