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Fig. 3 | BMC Research Notes

Fig. 3

From: The consistent difference in red fluorescence in fishes across a 15 m depth gradient is triggered by ambient brightness, not by ambient spectrum

Fig. 3

Iris fluorescence in response to spectral composition. Iris fluorescence brightness of Tripterygion delaisi measured as total photon radiance (photons s−1 sr−1 m−2) in the spectrum experiment. Fish group 1 (n = 20) started with the −20 m spectrum (phase I) and changed to the −5 m spectrum after 6 weeks (phase II), whereas group 2 (n = 20) received the opposite treatment. Fish were checked for another 4 weeks after the light switch. Lines represent mean total photon radiance for group 1 (dashed) and 2 (solid)

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