Pineal control of the circadian rhythm of colour change in the killifish (Fundulus heteroclitus)

Abstract
The killifish displays a circadian rhythm of color change (pigment aggregation and dispersion) under constant light and temperature conditions. Pinealectomy eliminates the circadian rhythm of color change but does not affect physiological color change and background adaptation. Pineal control of the rhythm of color change is interpreted as arising from the pineal''s involvement in determining circadian organization.