Scientists acidified an Ontario lake for 17 years; decades later, trout remain below half their former level

A groundbreaking 17-year study on Lake 223 in Ontario revealed a complex response to acid rain.

While the water chemistry has recovered since the experiment ended, the ecosystem is lagging behind.

Fish numbers have not rebounded as hoped, with growth rates remaining low.

This underscores the vital message that true ecological healing involves much more than merely restoring chemical balance.