Low Danube waters bring huge mayfly swarms in Budapest
STORY: :: Mayflies swarm the river Danube earlier than usual and in greater numbers :: Budapest, Hungary :: July 23, 2025 :: Gyorgy Kriska, Associate Professor, Eotvos Lorand University “Since 2012 we have seen huge swarming in those years when the water levels are quite low. We think it is because the sun lights the…