SDLP councillor Declan Norris
More than 2,000 fish of all species and ages were killed in the Muff River at Eglinton on Friday.
Said Councillor Norris: “There is significant concern in the local area following this fish kill in the Muff River last week.
“A number of fish of all kinds have been killed as a result of pollution and we need to get to the bottom of exactly what happened and who was behind this.
“I will be contacting the Northern Ireland Environment Agency and the Loughs Agency for an update on their investigation and to ascertain what information has been obtained about this fish kill so far and to ensure that everything is being done to find those responsible.
“Pollution causes serious harm to our environment and this fish kill is being treated as a major incident.
“We need to send a clear message that pollution will not be tolerated, especially when it has such a harmful impact on wildlife and our local area.”
