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Updated: May 11, 2026

The Optokinetic Response as a Quantitative Measure of Visual Acuity in Zebrafish
Published on: October 9, 2013
Sensitivity differences in fish offer near-infrared vision as an adaptable evolutionary trait.
Denis Shcherbakov1, Alexandra Knörzer, Svenja Espenhahn
1Institute of Zoology, University of Hohenheim, Stuttgart, Germany. denis.scherbakov@uni-hohenheim.de
Fish can detect near-infrared (NIR) light, with sensitivity varying based on habitat. Turbid water dwellers show higher NIR sensitivity, suggesting vision adapts to environmental light conditions.
Area of Science:
- * Sensory Ecology
- * Vision Research
- * Ichthyology
Background:
- * Near-infrared (NIR) light is present in solar radiation and aquatic environments.
- * Fish possess the ability to sense NIR light, with its utility dependent on environmental factors.
- * Water turbidity influences the spectral composition of light, enhancing NIR in turbid conditions.
Purpose of the Study:
- * To investigate the near-infrared (NIR) detection thresholds in five fish species.
- * To correlate NIR sensitivity with the availability of NIR light in their natural habitats.
- * To understand the adaptive significance of NIR vision in fish.
Main Methods:
- * Phototactic swimming assay used to determine NIR detection thresholds.
- * Five fish species with varying habitat light conditions were studied.
- * Spectral sensitivity thresholds were measured across different NIR wavelengths.
Main Results:
- * Nile and Mozambique tilapia (turbid waters) showed highest sensitivity above 930 nm.
- * Zebrafish, guppy, and green swordtail (clear waters) had lower thresholds (825-910 nm).
- * A strong correlation exists between NIR sensation thresholds and habitat NIR availability.
Conclusions:
- * Fish exhibit adaptable NIR vision, correlating with environmental light conditions.
- * NIR detection is an evolutionarily significant visual trait in fish.
- * Species inhabiting turbid waters possess enhanced NIR sensitivity.
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