A major river is being polluted with de-icer from Edinburgh Airport, BBC Scotland has learned.
The fluid leaks into the Gogar Burn, which feeds into the River Almond, affecting salmon, trout and eels, according to the Forth Rivers Trust.
An enforcement notice was issued to the airport by the Scottish Environment Protection Agency (Sepa) last year.
The airport said it has invested in machinery and infrastructure in a bid to reduce the impact.
De-icer is sprayed on planes before take-off when the temperature goes below 5C, as a vital safety measure.