AT A GLANCE
- Common Name: Corkwing Wrasse
- Scientific Name: Symphodus melops
- Category: Fish
- Subcategory: Bony Fishes
- Range: Northeastern Atlantic Ocean, from central Norway and the North Sea south around the British Isles, France, and the Iberian Peninsula to Morocco, and into the western Mediterranean
- Habitat Type: Shallow coastal rocky reefs, kelp forests, seaweed-covered boulder fields, and eelgrass beds from the intertidal zone down to 30 meters depth
- IUCN Red List Status: Least Concern
- Lifespan: 5 to 9 years
- Diet: Carnivorous (small benthic crustaceans, amphipods, isopods, tiny shore crabs, sea snails, and parasitic sea lice)
- Average Size/Weight: Length 15 to 20 cm (maximum up to 28 cm); weight 150 to 350 g
- Key Defining Feature: Vividly patterned inshore reef fish with a diagnostic black spot on the tail wrist, featuring breeding males adorned with glowing turquoise-blue facial squiggles and elaborate seaweed nests
Overview
The Corkwing Wrasse (Symphodus melops) is one of the most colorful, behaviorally complex, and familiar inshore reef fishes of the rocky Atlantic coasts of Europe. Belonging to the wrasse family Labridae, this curious coastal dweller lives among kelp fronds and boulder crevices. Renowned for the dazzling labyrinth of electric turquoise facial markings sported by breeding males and its role as a natural ‘cleaner fish’ that picks parasites off larger fishes, it is famous for its intricate, woven seaweed nests.
Biology and Physical Characteristics
Symphodus melops has a compact, oval, deep-bodied shape with large, thick lips and small, sharp conical teeth. Its primary diagnostic mark, present in all life stages, is a distinct, dark comma-shaped spot positioned just behind the eye and a prominent, round, black spot located dead-center on the wrist of the tail (caudal peduncle). Coloration is variable and sexually dimorphic: females are mottled in earthy olive-browns and golden-tan with pale bellies. Breeding males, by contrast, are an explosion of marine artistry: their bodies flush with emerald-green and brick-red, while their cheeks and head are covered in an intricate maze of glowing turquoise-blue and orange squiggles.
Behavior and Ecology
In spring, territorial male Corkwing Wrasses perform extraordinary architectural feats: gathering dozens of different species of red, green, and brown seaweeds in their mouths, they meticulously wedge and weave them into a dense, spherical nest the size of a football inside a rocky crevice. The male actively coats the nest in sticky mucus, courts females to lay eggs inside, and defends the nursery aggressively against crabs and wrasses. The species also features ‘sneaker males’ that look like females, sneaking into nests to fertilize eggs while the territorial male is distracted. Because of their voracious appetite for parasitic sea lice, wild corkwing wrasses are widely deployed in commercial salmon aquaculture as eco-friendly cleaner fish.
Conservation and Human Impact
The Corkwing Wrasse is evaluated as Least Concern on the IUCN Red List. It is abundant along the rocky shores of the UK, Ireland, France, and Norway. In recent decades, heavy localized trapping of live wild wrasses to supply cleaner fish to industrial salmon farms raised concerns about local reef depletion, prompting fishery regulators in Norway and Scotland to implement strict trapping quotas, seasonal bans, and size limits.
Interesting Factoid
The male Corkwing Wrasse is an expert underwater basket-weaver; he spends weeks gathering hundreds of pieces of different colored seaweeds in his mouth, weaving them into a tidy football-sized nest wedged inside a rock crevice.