Kralendijk, Bonaire
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Witnessed Iridophores
The predominant color of Queen Triggerfish is blue. Yet, here, while filming it changed to purple – not a normal color change. This is because Queen triggers, in addition to chromatophores, have iridophores which create iridescent colors. These are chromatophores that contain highly reflective guanine crystals which act as mirrors. As the fish tilts the light hits these iridophores causing the colors blue to go to purple – a perceived change in color depending on what color light gets through.
Queen Triggerfish Iridophoes in Action