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Colour vision in billfish.

K A Fritsches1, J C Partridge, J D Pettigrew

  • 1Vision, Touch and Hearing Research Centre, Department of Physiology and Pharmacology, University of Queensland, Brisbane, Australia. k.fritsches@vthrc.uq.edu.au

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|November 18, 2000
PubMed
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Billfish possess two cone types, suggesting color vision, challenging previous assumptions of monochromacy. Their UV-reflecting coloration may be perceived by prey but not by the billfish themselves.

Area of Science:

  • Marine Biology
  • Vision Science
  • Ichthyology

Background:

  • Billfish are open-ocean predatory fish with poorly understood visual systems.
  • Previous research suggested billfish might be monochromats, lacking color vision.

Purpose of the Study:

  • To investigate the visual abilities of billfish, specifically their color vision.
  • To identify cone types and spectral sensitivities in billfish eyes.

Main Methods:

  • Microspectrophotometry (MSP) to measure pigment absorption.
  • Spectrophotometric measurements of billfish coloration.
  • Analysis of billfish and prey lens transmission spectra.

Main Results:

  • Evidence of two anatomically distinct cone types in billfish, arranged in a pattern indicative of color vision.

Related Experiment Videos

  • Rod pigment peak absorption measured at 484 nm.
  • Billfish coloration reflects ultraviolet (UV) light at 350 nm, but their lenses block UV light.
  • Prey species possess lenses that transmit UV light, potentially allowing them to see billfish UV signals.

    • Conclusions:

    • Billfish likely possess color vision due to distinct cone types.
    • Billfish may be unable to perceive the UV component of their own coloration.
    • UV signals may play a role in predator-prey interactions, with prey potentially detecting billfish UV patterns.