Rasilan rannan sinileväesiintymä

The first blue-green observations in Imatra and Ruokolahti

Slightly blue-green on the shores of Rasila and Ukonlinna.

The environment office of the Imatra region monitored beaches at Ruokolahti and Imatra on Tuesday 18.6.

In Ruokolahti, the public beaches, Pappilanlahti, Vaittila, Rasila, Hann'ahonniemi and Oritlammi were inspected. Some blue-green algae was observed at Rasila beach.

There was also a slight blue-green algae in the Ukonlinna beach at Imatra. There were waves in Lempukka and the algae did not appear visually. Some flakes were visible in Liete, at lake Immala. There are warning signs on the notice boards and algae identification instructions for the three beaches of Imatra.

Water samples were taken from the Rautjärvi and Parikkala beaches on 17.6. and there were no blue-green on those shores.

The situation may change in a matter of hours

The blue-green algae situation in the beach may change within hours under the influence of wind or rain. For this reason, it is always a good idea to swim by looking at whether there is blue-green in the water. Adults should follow, where the children swim and prevent children from swimming in herbal water.

The algae is being monitored on the public beaches, and if the any alga is found, a warning sign is placed on the beach. Due to natural fluctuations, the sign may be redundant the next day - on the other hand, the algae may appear on the beach suddenly.

- For this reason, the everyone should observe the blue-green algae situation by oneselves, advises the environmental engineer Armi Kainulainen.

For more information:

Environmental Engineer Armi Kainulainen, tel. +358 206174300, armi.kainulainen@imatra.fi

The water quality of the beaches is normally controlled by Juha-Pekka Satomaa, environmental engineer (now on vacation, return 26.6.)


Cyanobacteria produce skin irritant compounds as well as neurotoxic or liver toxins. About half of the studied cyanobacterials have been discovered to be toxic. The toxicity of cyanobacteria depends on the species and conditions of the algae. At the same algae occurrence, some of the algae mass may be toxic and some do not. Non-toxic blue-green algae can cause skin and respiratory symptoms. Toxicity cannot be deduced from appearance but can only be detected in laboratory tests. Therefore, all abundant algae deposits should be treated with caution.

Instructions for a cyanobacterial deposit:

• Do not swim in water rich in blue-green algae

• Keep pets and children away from the beach if there is plenty of blue-green algae in the water

• Be careful not to swallow blue-green algae

• Do not use blue-green algae water as washing or steam water

• Blue-green algae do not disappear when boiling water

• Do not water edible vegetables such as lettuce with blue-green algae

• Cyanobacteria can cause skin symptoms, burning eyes, flu, muscle pain or nausea. If you suspect that you have swam in cyanobacterial water or swalloed algae water and you have symptoms:

• Spray blue water out of your skin and eyes with plenty of clean water 
• Use medical charcoal if necessary (carbon tablets are available from a pharmacy).
• Contact the Poison Information Center for advice and guidance 24 hours a day, number +358 9 4711
• In case of severe poisoning, go to see a doctor

How to recognize cyanobacterial water:

• A greenish layer on the surface of the water or on a beach that reminds of latex paint or a thick pea soup
• A smaller occurrence appears in the water as greenish particles and on the beach in greenish stripes
• Weak wind can pile up algae mass to the shore. The strong wind mixes the algae with water
• Older appearances become greenish-gray and sometimes also bright turquoise
• About half of the occurrence is toxic
• common in mid-summer, late summer and early autumn
• The smell of algae is earthy, moldy and / or stale