Crayfish

One of the last remaining strongholds for the native white-clawed crayfish has seen around 100 die in recent weeks after developing unexplained symptoms.

Natural Resources Wales (NRW) is carrying out urgent tests on the River Irfon near Builth Wells after they received reports of dead crayfish.

Tests confirmed the existence of Crayfish plague which is believed to be "harmless to people, pets, livestock and all other freshwater organisms".