The size of megafish in the Mekong River has shrunk alarmingly in recent years owing to overfishing, a study has found. The length of the largest and most endangered freshwater giants, some as big as grizzly bears, decreased by 40% in seven years.
Some fish, like the Mekong giant catfish, have been studied for over a longer period and show a decline in weight of 55% in the past 25 years, dropping from an average of 180kg (397lb) to 80kg.
