Cuckoo Wrasse

The cuckoo wrasse, Labrus mixtus, is one of the most colorful fish found in the temperate waters of the Northeast Atlantic and Mediterranean Sea. It shows striking sexual dimorphism: males display bold, alternating stripes of blue and orange along an elongated body, while females and juveniles are pink to orange with a row of distinctive black spots edged in white along the back. Like many wrasses, it is a protogynous hermaphrodite, with individuals typically starting life as females and some later transitioning into the more vividly colored males. It inhabits rocky reefs and kelp-covered seabeds, where it feeds on small invertebrates. Though not a coral reef species, it occupies a similar rocky-reef ecological niche in cooler waters.

• Slender, elongated wrasse body shape
• Males display alternating bright blue and orange-yellow horizontal stripes along the flanks
• Females and juveniles are pink to orange with three prominent black spots edged in white along the dorsal area
• Pointed snout with moderately sized mouth and small, fine teeth
• Single continuous dorsal fin running most of the back length
• Distinguished from other Northeast Atlantic wrasses by its bold blue-orange male striping and spotted female pattern
• Sexes are so different in color they were historically thought to be separate species

Cuckoo wrasse are found in the Northeast Atlantic from Norway and the British Isles south to Morocco, as well as throughout much of the Mediterranean Sea. They inhabit rocky reefs, boulder fields, and kelp-covered seabeds, typically at depths from around 5 to 100 meters, favoring structurally complex habitat with crevices and overhangs for shelter. They are more common in cooler, temperate rocky-reef environments than on true coral reefs, reflecting their northern range compared to many tropical wrasse relatives. Juveniles and females often occupy shallower rocky areas, while larger males may range across a broader depth distribution within suitable reef habitat.

Cuckoo wrasse are active daytime predators that forage among rocky crevices and kelp holdfasts for small invertebrates such as crustaceans, mollusks, and worms, using their small, fine teeth to pick prey from crevices. Like many wrasses, they are protogynous hermaphrodites, with most individuals beginning life as females and some transitioning to the more brightly colored, dominant male form as they mature. Males may defend loose territories on the reef and court females with courtship displays before spawning. At night, cuckoo wrasse become inactive and rest hidden among rocks or bury themselves in sediment, similar to other wrasse species, becoming largely dormant until daylight returns.