Environmental officials have determined the cause of death for 1,000 in Ridley Park Lake earlier this month. It’s the same thing officials warn elderly residents and young children about: heat.
Temps rose in the lake ahead of the June 11 fish kill, causing a lack of oxygen, Health & Science reporter Carolyn Beeler explains. The combination of rising water temperatures and oxygen-sucking algae blooms proved too much for the fish, who asphyxiated.
Environmental experts say human interference from things like fertilizer and lawn nutrients can also lower the lake’s oxygen levels.