Sinn Féin is calling for action to be taken following a major fish kill at Carrig River in Newcastle, Co Down.
Environment spokesperson Oliver McMullan MLA said ecosystems in Northern Ireland are under growing threat.
Over 1,600 fish were killed in a pollution incident and an investigation is currently underway.
Mr McMullun said: "This latest fish kill caused by a chemical spillage is unacceptable and is another major kill in what has been a disastrous year for our rivers.
"The number of incidents so far this years is above the 150 mark compared to only 100 for last year in total.
"I will be contacting the Agriculture minister who now has responsibility for these incidents to press her for greater enforcement and protection of our rivers."
(CD/LM)
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