Toxic blue-green algae returns to Llyngwyn

16 September 2024

The Wild Carp Trust has been very lucky this year with its carp rescue activities at Llyngwyn. The very cold spring (we had snow in May) and cool wet summer has meant that algae and weed growth is much less than we feared. However, hot weather finally arrived in September. Blanket weed bloomed and, this weekend, blue-green algae returned.

If the algae and weed blooms prolifically, it will use up a lot of dissolved oxygen in the water when it dies in the autumn which could stress or kill the carp.

Rhayader AA are monitoring oxygen levels daily, using the Wild Carp Trust’s oxygen meter, and are treating the water with barley extract to kill the algae before it blooms too much.