Depicts all 12 of the magical sea creatures in the Luminous Marine Life series in silhouette. Air bubbles up between them and a tail fin disappears beneath the waves to the right. Surrounded by the country name and the denomination.

Depicts a wide band reminiscent of an old-fashioned porthole, that frames an aquatic scene and features a blue doctorfish in the center. Several types of coral are shown in the background, along with two yellow-coloured blue doctorfish, as the juvenile fish are that colour. When the coin is illuminated with ultraviolet light, the doctorfish begins to glow green and slightly bluish.

With its disc-shaped body, vivid blue color, intense stare, and pursed lips, the blue doctorfish resembles a child's drawing. Named for the razor-sharp, scalpel-like bony projections on its tail, the blue doctorfish uses this "scalpel" to ward off rivals, extending it as a threat. If the warning is ignored, the fish can inflict deep cuts.

Young blue doctorfish, about the size of a 1 euro coin, start their lives on the seabed and glow a vivid greenish color under special light. They play a crucial role in coral reef health by removing algae, which allows coral to thrive, and their droppings fertilize the reef.