Harmful algae appears on Lough Derg

Lake users are being advised that harmful algae blooms have been spotted on Lough Derg again recently.

 

The blue-green algae can produce harmful toxins and contact can lead to skin irritation. It typically appears in July, usually during warm, damp weather conditions.

 

The Lough Derg Science Group reports that up until last week the lake was unusually free of these nuisance species. In fact, lake water clarity in 2016 has been better than in any of the previous 15 years.

 

But last Wednesday, LDSG detected a marked increase in blue-green algal species in Dromineer Bay. In advising Tipperary Co Council of the appearance, the local group noted that Dromineer will be hosting various water-contact events over the coming weeks, including the Irish Optimist National and Open Championships.

 

“It is too early to predict how severe or prolonged this outbreak will be, or where the highest densities might occur (this will depend on weather conditions),” LDSG advised. “In the interests of health & safety, and for the benefit of bathers, sailors and pet owners visiting the area, it would be appropriate to check that the relevant notices at Dromineer beach and harbour, warning of the hazards, are prominently displayed.”

 

The group also recommended that the council should carry out regular inspections of the water's edge at Dromineer beach over the coming weeks.

 

Director of Environment Services Matt Shortt said the council continuously monitors Lough Derg for algae blooms during the summer. The most recent inspection was carried out last Friday and no algae was observed. Another inspection was taking place on Tuesday of this week.

 

Mr Shortt pointed out that the algae occurs randomly and can appear and disappear quite quickly. He said the council has installed signs at Dromineer and other lakeside amenity areas advising people of the situation. The council has taken the LDSG concerns on board and will continue to monitor the lake.

 

The harmful algae is most easily recognised when it forms a bright pea-green paint-like scum on or close to the shoreline. People are advised not to swim where they see this substance, to keep animals away from the affected area and ensure animals have an alternative source of drinking water. Further queries can be referred to Tipperary Co Council at 0761 06 5000.