The city of Cape Town has established that an "extensive algal bloom" was the primary cause of fish dying in the Zandvlei Estuary Nature Reserve last week.
"The extensive algal bloom comprising the species Prymnesium parvum, commonly referred to as "Golden algae", is responsible for the aforementioned conditions," said Belinda Walker yesterday.
Walker, a member of the mayoral committee for economic, enviromental and spatial planning, said the toxins that golden algae produced appeared to have no negative effect on other wildlife, livestock or humans. She said as "a common sense precaution" dead or dying fish should not be consumed.
The city is doing all that it can to monitor the Zandvlei estuary, preserve its biodiversity as well as the integrity of the system, said Walker.