Inland Fisheries Ireland (IFI) says it is continuing to investigate a major fish kill in Co Cork in which at least 5,000 fish have died.
The pollution incident occurred on the River Allow, a tributary of the Munster Blackwater catchment at Freemount in the north of the county.
The incident occurred in a Special Area of Conservation, and the location is a noted spawning habitat.
Species of fish discovered dead include juvenile Atlantic salmon, brown trout, lamprey, eel, stone loach, roach and dace.
The river supports a population of freshwater pearl mussel, as well as being an abundant salmon and trout habitat.
Fisheries officers are still attempting to determine the scale of the kill, with fish mortalities observed up to 4km downstream of the source location.
IFI staff have been on site again on Monday (10 June) to investigate the pollution event, and assess the extent of the impact on the local environment.
Water samples have been taken from the river to gather evidence of the discharge, and source point of contamination, to advance any potential prosecution.
