Blue-green algae, or cyanobacteria, is a group of bacteria that can contain dangerous toxins which can be harmful and potentially fatal to pets, livestock and birds.
One badly affected freshwater lake - Lough Neagh in Northern Ireland - is being devastated by the algae, which has formed uncontrollable blooms over the summer.
Dogs die after drinking from lake in Highams Park filled with toxic algae itv.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from itv.com Daily Mail and Mail on Sunday newspapers.
Warning issued to dog owners as several pets die in toxic lake birminghammail.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from birminghammail.co.uk Daily Mail and Mail on Sunday newspapers.