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A second pollution incident in the Nant yr Aber river in less than a month is unrelated to the first, Natural Resources Wales (NRW) has confirmed.

Around 800 metres of the river, near the Asda store in Caerphilly, was affected on September 16, according to NRW.

In a statement, the environmental body said: “Officers attended the site swiftly and were able to identify the source of the pollution with the help of our partners Dwr Cymru Welsh Water. There were no signs of any dead fish or fish in distress.

“We can confirm this incident is unrelated to a similar incident which occurred on the Nant yr Aber during the summer.”

On August 30, a section of the river turned white and murky, killing more than 100 fish – including trout, salmon, grayling and bullheads.

NRW has confirmed both investigations into the pollution remain active, therefore it is unable to share details of the exact causes.

Morgan Jones ward councillor Shayne Cook, who reported the pollution to NRW, described it as a “milky substance sitting on top of the water”.

He said: “This is another sad case of pollution on the Nant yr Aber, which will have long term consequences for our local ecosystem.”

The NRW spokesperson added: “All pollution incidents are a matter of concern and we aim to deal with them as quickly as possible. Where pollution is identified, appropriate action will be taken.

“If anyone sees any further signs of pollution in the area or has any other environmental concerns, they should report it immediately to our incident hotline on 0300 065 3000, which is open 24 hours a day, or via the report it form on our website.”