Abstract
Nile tilapia fish were individually reared under similar light levels for 8 weeks under five colored light spectra (maximum wavelength absorbance): white (full light spectrum), blue (∼452 nm), green (∼516 nm), yellow (∼520 nm) or red (∼628 nm). The effects of light on feeding, latency to begin feeding, growth and feed conversion were measured during the last 4 weeks of the study (i.e., after acclimation). We found that red light stimulates feeding, as in humans, most likely by affecting central control centers, but the extra feeding is not converted into growth.
Highlights
The effects of environmental color on fish have been increasingly studied during this century, after the first publication of endocrine modulation by light color [1]
We investigated the chronic effects of environmental light color only after the fish had adjusted to the colored light environment
Motivation for Feeding In study 1 we found that light color affected motivation for feeding; that is, fast feeding behavior was more frequently observed in the red light condition (Fig. 1)
Summary
The effects of environmental color on fish have been increasingly studied during this century, after the first publication of endocrine modulation by light color [1]. We investigated the effects of light color on fish growth. When imposing experimental color regimes on fish, researchers simultaneously address the effects of colors on the adjustment of the animal to the novel environment and the effects of colors on the studied parameters (e.g., growth). To avoid this confound, we investigated the chronic effects of environmental light color only after the fish had adjusted to the colored light environment
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