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Mystery Solved: How Archerfish Shoot Water at Prey With Stunning Precision

Like a major league pitcher throwing a baseball, archerfish aim a powerful jet of water at their prey—and they do it by changing the shapes of their mouths, a new study says. Previously, researchers knew simply that the rain forest fish squirted water at their intended victims, knocking the bugs or small animals off their perches and into the water, where they’re quickly gobbled up. (Also see “Fish-Eating Spiders Can Catch Prey 5 Times Their Size.”)

A photo of three archerfish trapping prey by spitting water to capture them.
Archerfish of the species Toxotes jaculatrix take down insects in Indonesia. Photograph by A&J Visage, Alamy

freshwater species of the weekNow, new research published September 4 in Current Biology reveals that the archerfish are far more skilled at creating and using these water jets than anyone had guessed—and that the animals may even manipulate water like a tool. “It’s really a remarkable study,” said Alberto Vailati, a physicist at Italy’s University of Milan who has studied archerfish but was not involved in the new research. “It’s very interesting to see such a simple animal perform a very complex task.”

Testing the Waters

Archerfish include several different species in the genus Toxotes, which live in Thailand and other parts of Southeast Asia. Their ability to squirt water jets at prey has made the fish popular in aquariums, which is how researcher Stefan Schuster was first introduced to them. A physicist at the University of Bayreuth in Germany, Schuster studies the nerve circuitry that helps control relatively simple behaviors. His tiny apartment didn’t have room for a large aquarium, though, so he brought his new pets—which belong to the species Toxotes jaculatrix—into the lab. Watching the fish in action, he realized that his new officemates were the model organism he had been looking for. (See “Do You Know Where Your Aquarium Fish Come From?“) Archerfish, Schuster learned, shoot a surprisingly powerful blast of water. As the University of Milan’s Vailati describes it, “If you get hit in the face with this jet, it stings like an insect bite.” Shooting such a strong, targeted stream of water isn’t as easy as it looks. To generate enough force to hit an insect and knock it over, the fish would need to concentrate the force of the water into one giant burst. Schuster and colleague Peggy Gerullis were determined to find out how the archerfish accomplished this, a process that ultimately took them four years. The team started by training a group of nine archerfish to squirt at insect prey in a specific spot in the tank so that they could measure the force and velocity of the stream, as well as record it using a high-speed camera. Tool-Using Archerfish? After analyzing hundreds of hours of data, Schuster and Gerullis finally had their answer. When squirting water, archerfish continually change the shapes of their mouths so that the water stream will successfully aim and fire at prey, the study found. By doing this, the fish essentially alter the properties of moving water. (See National Geographic’s pictures of fish schools.) Most important, the water at the end of the stream is shot out at a faster speed than the water at the beginning. This means that all the squirted water slams into the victim in a short burst, giving it maximum force. Both Schuster and Vailati believe that, because the fish actively and deliberately influence the hydrodynamics of the water, it qualifies as tool use. (Also see “First Pictures: Wild Fish Uses Tool.”) “It’s analogous to a human throwing a stick,” Schuster said. “If they just threw the stick, it wouldn’t count as using a tool because they didn’t change it. But if they sharpened it or removed branches, that would be a tool.” These results may be the start of a sea change in what we think about fish intelligence. Follow Carrie Arnold on Twitter and Google+.


  1. Timothy Lee
    June 25, 8:51 pm

    God created the his creation so perfectly and there is undeniable proof.-“to Roman Reigns”

  2. Roman reigns
    May 26, 3:33 am

    Archer fish is not designed by **** god . it has evolved by natural selection.

  3. Mohamed. S. Omarjee
    May 10, 10:50 am

    God says in the Qur’aan: He creates as He wishes-indeed God has power over all things- what an amazing creation, it lives in the water, but it’s food is found outside the water- Glory be to God, the perfect creator.

  4. Mohamed. S. Omarjee
    Durban, South Africa
    May 10, 10:46 am

    God says in the Qur’aan- He creates as He wishes-indeed God has power over all things-what an amazing creation

  5. Raven Starling
    April 18, 7:51 am

    Yes, Sherry, God made these fish very unique

  6. Jack Clarke
    North Georgia U S A
    November 28, 2016, 4:08 pm

    the Explanation is Very Easy to understand, These creatures were Designed by a Designer, Even a house has to be built by someone,

  7. Sherry Dunn
    May 19, 2015, 12:31 pm

    What an incredible design by our Creator!

  8. cris
    May 12, 2015, 4:25 pm

    Evolution is an amazing process.

  9. Ashok
    March 20, 2015, 7:12 am

    Out of ignorance only we believe that only humans / apes use tools . The myth stands busted. That why I say :”Help preserve Environment because the Universe is a single cell entity. We are just the infinitely minuscule organelles within it. We are all the same, for the same and from the same infinite eternal energy.”…..(Ashok Manvati)

  10. Roland
    October 10, 2014, 7:14 pm

    Another intricate design by our Creator.

  11. emmanuel
    September 8, 2014, 8:32 pm

    very nc

  12. Abdulhamed
    September 6, 2014, 8:09 am

    I would to express my admiration to national geography channel for clarity of explanation as well as the outstanding timing for their real life pictures of nature and its species
    I am a big fan of science and of this channel which I love
    so keep up the great work and en-light us with updates

  13. Venugopal
    September 5, 2014, 8:44 pm

    What an amazing water tool to catch the prey

  14. Mulindwa moses
    Kampala uganda
    September 5, 2014, 3:38 am

    So amazing

  15. rgw46
    September 4, 2014, 2:37 pm

    cool—we need to do that with ISIS…with a NUC..