NATURAL Resources Wales (NRW) is investigating a pollution incident after receiving reports of discolouration of the River Teifi in Ceredigion on Saturday (17 December).
NRW officers have been to the river and identified the likely source as being from an agricultural site in the Tregaron area.
At least 1,000 fish have been killed, including salmon and sea trout.
Work continues to assess the extent of the impact and investigate the cause of the incident.
Pollution control measures such as bunds are in place to reduce the impact on the river and wildlife.
Gavin Bown, South West Duty Manager for NRW, said: “Our rivers provide a home to rich, diverse and valuable species of plants and animals so it’s important to deal with pollution as quickly as possible.
“Our officers will continue to assess the full impact on the river and make sure that control measures remain in place until we’re sure that no more pollution will enter the river.
“We’d like to thank the people who reported the incident to our 24 hour incident line on 03000 65 3000.”
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