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The Danger of Killer Algae

Updated on June 13, 2015

Killer algae or caulerpa taxifolia is an invasive species that is capable of rapid growth and spreading. Its range is augmented by ballast water. It has wiped out other algae and sea grasses and even whole communities by outcompeting native species for food.


Killer algae is native to tropical waters, like the Caribbean and off the coast of Africa. But because of ballast water and improper disposal from aquariums, it has been found off the coast of southern California and near France.

Prey and Predators

A natural predator to killer algae is a sea slug called Elysia subornata, which gets its nutrients solely from killer algae, by sucking out the sap, and killing it. The slug's enzymes neutralize the poison from the algae, which keeps it unharmed but protects it from other predators.

Natural Defenses

Has a high tolerance for extreme conditions. It can live out of water for up to ten days. Killer algae can also live in low water temperatures, and can plant itself in many different terrains, including sand, dirt, between rocks, and on seabeds.

It contains a deadly poison that kills most things that eat it. Its biggest defense, however, is its sheer volume. It spreads so quickly, that it can out-compete most species for resources and predators would have a hard time of depleting it.


Killer algae is asexual and reproduces through a process called fragmentation, where the algae splits into different fragments which then mature into adulthood.

The Harmful Effects of Killer Algae

Killer Algae became an invasive species because of poor disposal of aquariums. Because it's pretty and easy to care for, it's a very popular decorative plant to put in fish tanks and aquariums. Its high tolerance makes it impossible for most herbivores to prey on it, so it can spread unchecked in new areas. Its rapid reproduction smothers out other plants like dandelions in flower beds, killing entire ecosystems. However, it is possible to get rid of it after it takes over an area. In fact, California recently got rid of it themselves.

What We Can Do

The best thing we can do about killer algae is to not get it for aquariums or fish tanks, and if we do get it, to make sure it is properly disposed of.


Center for Invasive Species Research.

Marine Algae of Hawai'i.

University of California.


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    • K Johnny Varghese profile image

      KJohnny Varghese 

      5 years ago from India

      I have heard that Algae is an important food supplement. It's full of nutrients and vitamins neccessary for our body. Good to know even, killer forms of algae exist.

    • Larry Rankin profile image

      Larry Rankin 

      5 years ago from Oklahoma

      Nasty stuff. Thanks for raising my awareness.


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