blue-green

The deep, warm blue-green of teal is a colour that he most associates with Brussels.

Under certain conditions, blue-green algae can become abundant in warm, shallow, undisturbed, nutrient-rich surface waters that receive a lot of sunlight.

The blue-green algae, known as cyanobacteria, is a natural part of the ecosystem but can rapidly grow under certain conditions, including warm temperatures and calm water.

Some volunteer river clean-up events have been postponed as, similar to some other waterways in Northern Ireland, blue-green algae has emerged.

When BBC News NI visited Antrim Lough Shore Park on Thursday, a number of people voiced their displeasure at the blue-green algae levels.