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Related Concept Videos

Color Vision01:24

Color Vision

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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.
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Photoreceptors and Visual Pathways01:22

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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,...
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Channel Rhodopsins01:11

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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.
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Related Experiment Video

Updated: Jun 29, 2025

Assays to Detect UV-reflecting Structures and Determine their Importance in Mate Preference using the Sailfin Molly Poecilia latipinna
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Ultraviolet vision in anemonefish improves colour discrimination.

Laurie J Mitchell1,2,3, Amelia Phelan1, Fabio Cortesi1,2

  • 1School of the Environment, The University of Queensland, Brisbane, QLD 4072, Australia.

The Journal of Experimental Biology
|April 8, 2024
PubMed
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Anemonefish possess ultraviolet (UV) colour vision, enhancing their ability to detect colours and patterns. This UV vision improves the visibility of their body patterns for communication and prey detection.

Keywords:
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Area of Science:

  • Vision science
  • Animal behaviour
  • Aquatic biology

Background:

  • Ultraviolet (UV) vision plays a crucial role in animal navigation, foraging, and communication.
  • The contribution of UV signals to colour vision and discrimination thresholds is not well understood in many species.
  • Anemonefish (Amphiprion ocellaris) are a model organism for studying fish vision.

Purpose of the Study:

  • To investigate the role of ultraviolet (UV) colour vision in anemonefish (Amphiprion ocellaris).
  • To determine the UV colour discrimination thresholds using behavioural experiments.
  • To assess the impact of UV chromatic contrast on colour perception in anemonefish.

Main Methods:

  • Determined the spectral sensitivity of anemonefish cones using microspectrophotometry, identifying a UV cone sensitivity peak at ~386 nm.
  • Utilized a five-channel (RGB-V-UV) LED display for behavioural experiments.
  • Measured colour discrimination thresholds by training fish to differentiate target colours from distractors under varying UV conditions.

Main Results:

  • Anemonefish possess tetrachromatic vision with cone sensitivities peaking at approximately 386, 497, 515, and 535 nm.
  • Colour discrimination was significantly enhanced when target pixels contained UV signals, indicated by lower discrimination thresholds.
  • Higher UV chromatic contrast led to better colour discrimination, suggesting greater stimulation of the UV cone.

Conclusions:

  • Anemonefish utilize UV vision to improve colour discrimination.
  • The UV component of colour signals enhances detectability, likely aiding in communication and prey detection.
  • This study highlights the importance of UV vision in the natural behaviour of anemonefish.