One of the greatest joys of diving is discovering that the smallest creatures are often the most spectacular. Aishath our new dive instructor has an incredible eye for spotting nudibranchs, and thanks to her keen observation skills, many of our guests are seeing these tiny marine treasures for the very first time.

Nudibranchs are soft-bodied sea slugs that come in an astonishing variety of colours, shapes, and sizes. Found on reefs throughout the Maldives, they can range from just a few millimetres to over 30 centimetres long, although most species are much smaller. Their dazzling patterns of blues, oranges, yellows, purples, and whites make them some of the most photogenic subjects for underwater photographers.

But these vibrant colours are more than just beautiful — they are often a warning to predators. Many nudibranchs feed on sponges, corals, hydroids, or sea anemones, absorbing the toxins from their prey and storing them in their own bodies. Some species even recycle the stinging cells of anemones, using them as their own defence mechanism.

Unlike fish, nudibranchs have no protective shell, relying instead on camouflage, chemical defences, or bright warning colours to survive. Their name means “naked gills,” referring to the feathery gills found on the backs of many species, which gently wave in the current as they breathe.

There are more than 3,000 known species of nudibranch worldwide, and new ones continue to be discovered. Many have highly specialised diets, meaning they are often found on or near the exact organism they feed upon. This is one reason why finding them can be such a challenge — and why experienced guides who know where to look are worth their weight in gold.

The next time you join us for a dive, don’t just search the blue for sharks, turtles, or manta rays. Slow down, look closely at the reef, and you may discover a tiny splash of colour no bigger than your thumbnail. These remarkable little sea slugs prove that some of the ocean’s greatest wonders are also its smallest.