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Related Concept Videos

Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Channel Rhodopsins01:11

Channel Rhodopsins

Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
Osmoregulation in Fishes02:32

Osmoregulation in Fishes

When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
Photoreceptors and Plant Responses to Light02:00

Photoreceptors and Plant Responses to Light

Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.

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Related Experiment Video

Updated: Jul 8, 2026

Multimodal Optical Microscopy Methods Reveal Polyp Tissue Morphology and Structure in Caribbean Reef Building Corals
10:39

Multimodal Optical Microscopy Methods Reveal Polyp Tissue Morphology and Structure in Caribbean Reef Building Corals

Published on: September 5, 2014

Colour vision in coral reef fish.

U E Siebeck1, G M Wallis, L Litherland

  • 1Sensory Biology Group, School of Biomedical Sciences, University of Queensland, St Lucia 4072, Australia. u.siebeck@uq.edu.au

The Journal of Experimental Biology
|January 22, 2008
PubMed
Summary

Reef fish can learn to distinguish colors, demonstrating their unique color vision. This study provides the first behavioral evidence of color discrimination in damselfish, moving beyond human-centric observations.

Area of Science:

  • Marine Biology
  • Animal Behavior
  • Sensory Ecology

Background:

  • Sea creatures exhibit diverse light reflectance properties, notably in coral reef fish coloration.
  • Previous studies often interpreted fish coloration from a human perspective, neglecting the intended audience: other sea life.
  • Understanding reef fish visual systems is crucial for an ecological approach to their coloration.

Purpose of the Study:

  • To investigate the color vision capabilities of reef fish.
  • To provide behavioral evidence for the functional use of wavelength-tuned photoreceptors in reef fish.
  • To determine if reef fish can discriminate colors based on chromaticity alone.

Main Methods:

  • Classical conditioning was used to train damselfish to discriminate colored patterns for a food reward.

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  • Fish were trained within 3-4 days of capture.
  • Stimulus brightness was systematically varied to isolate color discrimination (chromaticity).

    • Main Results:

    • Damselfish successfully learned to discriminate target colors, achieving over 75% accuracy in trials.
    • The study confirmed that fish discriminated stimuli based on chromaticity, independent of brightness.
    • Reef fish demonstrated the ability to perform two-alternative discrimination tasks.

    Conclusions:

    • This research provides the first behavioral evidence that reef fish possess color vision.
    • Damselfish can learn and perform color discrimination tasks.
    • The findings support an ecological understanding of reef fish coloration by considering their visual perception.