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Related Experiment Videos

Ultraviolet-sensitive cones in the goldfish.

J K Bowmaker1, A Thorpe, R H Douglas

  • 1Department of Visual Science, University of London, U.K.

Vision Research
|January 1, 1991
PubMed
Summary
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Goldfish possess ultraviolet (UV) vision, confirmed by identifying a novel cone type in their retinas. This cone type contains a visual pigment specifically sensitive to UV light wavelengths between 355-360 nm.

Area of Science:

  • * Vision Science
  • * Retinal Physiology
  • * Photoreceptor Biology

Background:

  • * Behavioral studies indicated goldfish possess ultraviolet (UV) light sensitivity.
  • * The specific photoreceptor responsible for this UV sensitivity in goldfish remained unidentified.

Purpose of the Study:

  • * To identify the retinal cell type responsible for ultraviolet sensitivity in goldfish.
  • * To characterize the spectral sensitivity of the visual pigment within these cells.

Main Methods:

  • * Microspectrophotometry was employed to measure the spectral properties of visual pigments in goldfish retinal cells.
  • * Analysis focused on identifying cone populations with maximal sensitivity in the UV spectrum.

Main Results:

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  • * A distinct population of small, single cones was identified in the goldfish retina.
  • * These cones contain a visual pigment with a maximal sensitivity peak between 355-360 nm, corresponding to the UV spectrum.

Conclusions:

  • * The identified small, single cones are the likely substrate for goldfish ultraviolet vision.
  • * This finding provides a cellular basis for the previously observed behavioral UV sensitivity in goldfish.