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Journal of Experimental Biology 78,47-57 (1979)
Published by Company of Biologists 1979

Fluorescence and Luminescence of Isolated Photophores of Porichthys

F. BAGUET ¹ and A. M. ZIETZ-NICOLAS ¹

¹ Laboratoire de Physiologie Animale, Université catholique de Louvain, Belgium

1. Isolated photophores of Porichthys exposed to u.v. light (365 nm) exhibit a green fluorescence localized in the photocytes and a bluish fluorescence originating from the lens-like body.

2. The luminescence of photophores evoked by epinephrine, nor-epinephrine or potassium cyanide decreases with the intensity of the green fluorescence of the photogenic tissue; the bluish fluorescence of the lens-like body does not change significantly.

3. The total amount of light emitted is a linear function of the decrease of the greenish fluorescence intensity. The slope of the regression line is maximal in response to epinephrine or nor-epinephrine 5.10^- m and potassium cyanide 10^-3 m. It decreases significantly for higher concentrations.

4. The decrease of fluorescence observed during the light emission is tentatively explained by oxidation of a luciferin present in a fluorescent form in a fresh photophore.