Inland Fisheries Ireland (IFI) says it is continuing to investigate a significant fish kill near Ballingarry, Co Tipperary in which up to 500 fish may have died.
The pollution incident occurred on the upper reaches of the Kings River, a major tributary of the River Nore.
Dead fish including salmon parr and large numbers of trout of all ages were observed for around four kilometres downstream to where the Kings and Crohane Rivers meet, IFI says.
IFI was alerted to the incident last Monday 15 April following reports from members of the public to its confidential 24/7 phone line.
Fisheries environmental officers are monitoring and assessing the water quality in the river to try to establish a conclusive source for this pollution event.
IFI understands that Tipperary County Council is also commencing an investigation into the Kings River discharge.
The State environmental agency with responsibility for Ireland’s freshwater fish and habitats appeals to members of the public to keep reporting issues of concern to our confidential 24/7 number at 0818 34 74 24.