The loss of more than 2,000 fish from the Muff River at Eglinton as a result of pollution is a significant blow to the local environment, it has been claimed.
DUP councillor Julie Middleton said the loss of so many fish will have a "significant impact" on the river and like any significant pollution incident, it will "undoubtedly take some years for it to fully recover".
She said: "With a range of species and ages affected there will also be a wider effect on the environment too.
There is a particular fear that sea trout who return to the river to spawn may be impacted by the incident.
"There is now a joint investigation underway between NIEA and the Loughs Agency. I hope that they can quickly identify the source of this incident and ensure that enforcement action is taken.”
The NIEA has described the incident as a "major fish kill" and said a "specific line of enquiry" had been established.
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