A warning has been issued over suspected toxic blue-green algae in the River Hamble.
Visitors are being advised to avoid contact with the water, and to keep their dogs out as well, as the algae can be particularly harmful to them.
The recent hot weather has led to the appearance of the algae along the tidal river.
Although blue-green algae is a natural part of a freshwater ecosystem, its presence can be dangerous to humans, animals, birds, and fish.
The algae typically appear suddenly during periods of warm weather, followed by heavy rain and then more warm, still conditions.
These blooms are common between June and November and tend to remain until the weather becomes colder.
Once established, little can be done to completely remove an algal bloom.
Eastleigh Borough Council and the Environment Agency recommend avoiding contact with the algae as it can cause various health issues.
These include skin irritation, eye irritation, rashes, blistering, abdominal pain, diarrhoea, and nausea, which can occur through skin or eye contact or if swallowed.
For more information and advice, contact the Environment Agency at enquiries@environment-agency.gov.uk.
To report instances of blue-green algae, call the Environment Agency Incident Hotline on 0800 80 70 60.
Anyone who believes they have been affected by blue-green algae should seek medical advice immediately.
Pet owners should also seek veterinary advice if their animals come into contact with the algae.
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