More Blue-Green Algae has been discovered in Hamilton Harbour.
Public Health Services says the troublesome growth is in the western part of the harbour.
And they are advising residents and visitors to avoid swimming or wading near the shoreline and in shallow calm areas of water.
The algae leaves a noticeable green surface scum or green discolouration of the water is observed.
Children and pets are warned not to drink the water as it can cause skin irritation, headaches, fever, diarrhoea, abdominal pain, nausea or vomiting, skin rashes and mucous membrane irritation.