Fish chromatophores

Chromatophores are pigment containing cells found in many animals. In fishes they occur in the scales and the dermal layer of the skin .

The video shows the effect of epinephrine on scale chromatophores.  Click the YouTube link for more details.  More information on chromatophores.

There are a number of different kinds of chromatophores. They are divided into the following groups based on their colour under white light: xanthophores (yellow), erythrophores (red), iridophores (reflective / iridescent), leucophores (white), melanophores (black/brown) and cyanophores (blue). More information.