At least 15,000 fish have died after a suspected poisoning incident in Tipperary.
Inland Fisheries Ireland says the fish kill happened in a tributary of the Nenagh River near Ballymackey.
An investigation's underway, and fisheries officers believe weed killer or a pesticide may have got into the river last week.
1,400 dead trout and over 10,000 of the protected Lamprey species were found.
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Farmers are being reminded by Inland Fisheries about the risks of spraying chemicals near rivers and lakes.
