Anglers yesterday warned that Killarney's major tourist lake, Lough Leane, was now in as bad a state as it was a decade ago despite a multi-million euro programme to tackle pollution.
Kerry County Council has erected public warning signs of a potentially lethal toxic algal bloom. Water levels have fallen during the hot weather and a green scum has appeared.
An emergency meeting of a group set up to tackle phosphorus pollution has been called by the council for this week.
D J Riordan, of Killarney Salmon and Trout Anglers, said he expected fishing was finished on the lake for the summer.