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The high temperatures attract many people to the Swiss waters. Currently over 30 degrees are expected locally – perfect weather for bathing.
But not only people enjoy the heat, but also bacteria. A certain type of cyanobacteria, the so-called Burgundian blood algae, is currently increasing in Lake Zurich, reports Radio Zürisee.
Bacteria in Lake Neuchâtel: “We cannot rule out that it happens again”(00:45)
Badi puts up a warning sign
According to the Mayor of Horgen, Theo Leuthold, these are visible on the surface of the water through discoloration in Horgen and Wädenswil.
Pathogens are particularly dangerous to young children and pets. Recently a warning sign has been placed on the Käpfnach Badi: “Bathing in the lake at your own risk as a result of Burgundy blood algae”.
On Thursday, the Canton of Zurich Office for Waste, Water, Energy and Air received a message about red algae in the Wädenswil lido. “An investigation confirmed that it is blood algae from Burgundy,” says Pius Niederhauser, head of the surface water protection section, on request.
“It is extraordinary that the blood algae of Burgundy appear so soon”
In consultation with the cantonal laboratory, it was recommended to avoid areas with red algae when swimming. However, Niederhauser can give the go-ahead: “During the course of Friday the water cleared again, the increase in temperature and the intense solar radiation should continue to favor this.”
It is extraordinary that Burgundy blood algae are coming to the surface so early. “You can usually find 10 to 15 meters of water depth in summer and make up by far the largest proportion of biomass in the lake,” says Niederhauser. “From the cold and the wind, the cyanobacteria got up. Usually this doesn’t happen until the end of October. “
Blue algae infestation in the canton of Bern?
In late July, blue-green algae caused a stir. After six dogs died of poisoning at Lake Neuchâtel, a section of the beach was closed. The cantons of Vaud, Freiburg and Neuchâtel advised against swimming. Now the ban has been lifted.
A dog also died at the weekend in Moossee in the canton of Bern after drinking water from the lake, reports «Nau». A vet also suspects cyanobacterial poisoning in this case. (szm)
