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Research Article
Archerfish use their shooting technique to produce adaptive underwater jets
Jana Dewenter, Peggy Gerullis, Alexander Hecker, Stefan Schuster
Journal of Experimental Biology 2017 220: 1019-1025; doi: 10.1242/jeb.146936
Jana Dewenter
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Peggy Gerullis
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Alexander Hecker
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Stefan Schuster
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  • For correspondence: stefan.schuster@uni-bayreuth.de
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ABSTRACT

Archerfish are renowned for dislodging aerial prey using well-aimed shots of water. Recently it has been shown that these fish can shape their aerial jets by adjusting the dynamics of their mouth opening and closing. This allows the fish to adjust their jet to target distance so that they can forcefully hit prey over considerable distances. Here, we suggest that archerfish use the same technique to also actively control jets under water. Fired from close range, the underwater jets are powerful enough to lift up buried food particles, which the fish then can pick up. We trained fish so that we could monitor their mouth opening and closing maneuvers during underwater shooting and compare them with those employed in aerial shooting. Our analysis suggests that the fish use the same dynamic mechanism to produce aerial and underwater jets and that they employ the same basic technique to adjust their jets in both conditions. When food is buried in substrate that consists of large particles, the fish use a brief pulse, but they use a longer one when the substrate is more fine-grained. These findings extend the notion that archerfish can flexibly shape their jets to be appropriate in different contexts and suggest that archerfish shooting might have been shaped both by constraints in aerial and underwater shooting.

FOOTNOTES

  • Competing interests

    The authors declare no competing or financial interests.

  • Author contributions

    J.D. and P.G. performed experiments; J.D., P.G., A.H. and S.S. analyzed data and wrote the paper.

  • Funding

    This work was supported by the Deutsche Forschungsgemeinschaft (Schu 1470/9).

  • Supplementary information

    Supplementary information available online at http://jeb.biologists.org/lookup/doi/10.1242/jeb.146936.supplemental

  • Received July 27, 2016.
  • Accepted December 20, 2016.
  • © 2017. Published by The Company of Biologists Ltd
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Keywords

  • Animal tool use
  • Water jet
  • Animal cognition
  • Biomechanics
  • Evolution

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Research Article
Archerfish use their shooting technique to produce adaptive underwater jets
Jana Dewenter, Peggy Gerullis, Alexander Hecker, Stefan Schuster
Journal of Experimental Biology 2017 220: 1019-1025; doi: 10.1242/jeb.146936
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Research Article
Archerfish use their shooting technique to produce adaptive underwater jets
Jana Dewenter, Peggy Gerullis, Alexander Hecker, Stefan Schuster
Journal of Experimental Biology 2017 220: 1019-1025; doi: 10.1242/jeb.146936

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