Monday 30 June 2014
We want to warn visitors to Caerphilly Castle that the moat waters currently contain blue-green algae bloom that may be toxic to humans and animals.
We strongly urge our visitors to stay away from the water — and to keep their pets away — as the toxins the algae produce can cause severe illness.
Fishing and other activities involving the moat at Caerphilly Castle have been suspended.
What are blue-green algae?
There are a wide range of blue-green algae (cyanobacteria). In fresh waters, they’re suspended within the water or attached to rocks and other surfaces.
Blue-green algae and other algal groups are important contributors to the aquatic biology of fresh and marine waters.
They are primary producers that:
- convert sunlight to energy by photosynthesis
- release oxygen and carbon dioxide into water
- take up minerals
- produce food chain supporting substances.
Blue-green algae need nutrients to grow which exist in various forms in freshwater. The algae use them directly.