According to The News, about 300 carp living in a lake and drainage ditches next to IBM at North Harbour, Portsmouth, have died because the rare organism blocks their gills and prevents them from breathing.
The prymnesium algae has been growing in one of the drainage ditches the fish swim in to from the lake to spawn.
The dead fish were discovered earlier this week and now plans are in progress to put a barrier in place to stop the fish leaving the lake and entering the affected area.
Those fish that can be rescued from the drainage ditch will be cleaned and put into the lake.
Portsmouth and District Angling Society uses the lake and is hoping the fish death count will be prevented from rising.
Battle Against Algae Begins
UK - Attempts are being made to stop a killer algae from spreading.