One of the most brilliantly coloured fish in southern New Zealand waters. Large male scarlet wrasse are vivid scarlet red. Electric blue markings decorate their heads. Females and juveniles are orange-pink. The colouration is less intense. It looks like a fish on fire. The visual impact is immediate. The contrast is sharp. The reef provides the backdrop. The fish provides the flash. Like many wrasses, all scarlet wrasse are born female. The largest, most dominant individuals change sex. They become male. This colour change is one of the most dramatic in the fish world. A pink female transforms into a scarlet red male. The face gains electric blue markings. A fish that changes its entire identity. A fish that decides, late in life, to become something else. The biology is flexible. The hierarchy drives the change. It is not a choice in the human sense. It is a response to opportunity. The dominant female takes the role. The colours follow the status. The transformation is complete. Scarlet wrasse forage over rocky reefs and kelp forests during the day. They pick prey from crevices and under rocks. Strong canine teeth crush the shells of small crustaceans, worms and molluscs. It is a day feeder. It operates in the clear water of southern reefs. The visibility allows it to spot hidden prey. The teeth allow it to access protected food sources. The strategy is effective. The niche is specific. It avoids the open water. It stays close to the structure. Not targeted by commercial or recreational fishers. The size is small. The body is bony. It is caught occasionally as bycatch in lobster pots. Marine protected areas provide refuge for this colourful reef fish. The protection helps. The lack of commercial interest helps more. It survives because it is not worth the effort. The value is aesthetic, not culinary. The diver appreciates it. The chef does not. The Māori name is not separately recorded. Wrasse were likely known but not prized. Too bony. Too small. Too much trouble. The practical assessment stands. The cultural record is silent. The absence speaks to utility. If it was not eaten, it was not named. Or the name was lost. The result is the same. The fish remains unnamed in traditional lore. It exists outside that framework. It belongs to the visual present. That is the scarlet wrasse. A scarlet red fish with electric blue markings. It changes sex when needed. It patrols the kelp forests of the South Island. A fish that wears its identity lightly. It changes it when necessary. The adaptation is survival. The colour is signal. The behaviour is routine. It carries on.