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ACTION SPECTRA FOR THE IRIDOPHORE LIGHT RESPONSE IN THE NEON TETRA

Abstract The iridophores of some fishes such as the neon tetra (Paracheirodon innesi) are composed of alternating layers of guanine and cytoplasm. In the dark adapted state, the guanine layers are close together and reflect violet light. After illumination these layers separate and the iridophores reflect green light. The spacing change results from a direct action of light. Dose‐response curves show that more than one light sensitive mechanism are involved, but that at threshold the action spectrum fits a 461 nm porphyropsin absorbance curve.