Fish in a smoke-polluted canal were stunned using electro-fishing equipment, so they could be rescued more easily.
Parts of the Erewash Canal in Derbyshire were affected by low oxygen levels due to pollution from a major fire at the Stanton Works site in Stanton-by-Dale, at the weekend.
Dead fish were seen in the water, and the Environment Agency used hydrogen peroxide to increase oxygen levels in the canal with some success, but it was still only at just over 3% in some areas.
The teams used electric fishing equipment to lightly stun the fish, allowing them to be netted out and held in a tank before being transferred to a new location.
Eight fire engines and over 60 firefighters from the Derbyshire Fire and Rescue Service were in attendance at the height of the blaze on Saturday.
Why not take out a subscription to Practical Fishkeeping magazine? See our latest subscription offer.