Before diving into the ocean, be mindful of water quality. Here's what you need to consider:
As the weather warms up and many of us head to our favourite lakes and seas for a refreshing swim, it's essential to be aware of potential health hazards that could lurk in the water. In this article, we'll discuss two common issues - blue-green algae (cyanobacteria) and Vibrios - and offer advice on how to stay safe.
Blue-green algae are microscopic organisms that can thrive in various water bodies under specific conditions. They become more active when water temperatures exceed 20 degrees, and after prolonged sunshine, high temperatures, and fertilization of nearby fields. These organisms can create visible signs such as thick mats or scums floating on the water surface, discoloured water resembling pea soup or grass clippings, and even produce unpleasant odours or taste changes.
While some blue-green algae may only cause skin irritation, others produce toxins that can be harmful if a large amount of water is swallowed. To reduce health risks, it's crucial to avoid direct contact with water showing signs of harmful algal blooms, such as coloured scums, foam, or mats. It is also advisable not to swim, boat, fish, or let pets enter water showing suspicious blooms or decaying algae on the shore.
Another concern in recreational waters is Vibrios, tiny creatures that can cause unwanted reactions in swimmers but are not visible to the naked eye. Vibrios can worsen existing wounds and, in severe cases, pose a threat to people with weakened immune systems.
Lower water levels in summer may increase the proportion of water from wastewater treatment plants in lakes, potentially causing pollution. To stay informed about water quality, consult the websites of the German Environment Agency, the Federal Institute of Hydrology, and the European Environment Agency. It's also a good idea to read local press to stay informed about water safety in the Baltic Sea.
When swimming in recreational waters, it's essential to be vigilant and take precautions. After swimming, it's recommended to rub off vigorously with a towel and put on fresh clothes. If contact occurs with water containing algae or if skin irritation happens, rinse thoroughly with fresh water. In case of symptoms such as skin rash, vomiting, diarrhea, headache, sore throat, or fever after exposure to affected water, seek medical advice promptly.
It's also crucial to pay attention to signs and inform yourself through local media about the safety of non-designated lakes. Dogs are more sensitive to blue-green algae than humans, so keep pets away from affected water. In case of suspected harmful algal bloom-related health incidents, report them to appropriate authorities.
By following these guidelines, we can ensure a safe and enjoyable experience for everyone while enjoying our beautiful water bodies this summer.
[1] Blue-green Algae: Identification, Risks, and Prevention. (n.d.). Retrieved from https://www.who.int/water_sanitation_health/water-quality/guidelines/blue-green-algae/en/ [2] Cyanobacteria. (2021, March 10). Retrieved from https://www.epa.gov/nutrient-policy-data/cyanobacteria [3] Harmful Algal Blooms. (n.d.). Retrieved from https://www.cdc.gov/healthywater/swimming/cryptosporidiosis/harmful-algal-blooms.html [4] Vibrio. (2021, March 10). Retrieved from https://www.cdc.gov/vibrio/index.html
Science highlights the importance of understanding potential health hazards in recreational water, such as blue-green algae (cyanobacteria) and Vibrios. In environmental science, blue-green algae thrive in warm, nutrient-rich water, often causing visible signs like scums or discoloration. While some strains may cause minor skin irritations, others produce toxins harmful upon ingestion. To prioritize health-and-wellness, avoid contact with water displaying signs of harmful algal blooms, and be vigilant when swimming in recreational waters, particularly considering Vibrios, microscopic creatures that can exacerbate existing wounds and pose a danger to those with weakened immune systems.
