Brown Wrasse

Overview

The brown wrasse (Labrus merula) is a robust, slow-moving fish commonly found in the Mediterranean Sea and parts of the Eastern Atlantic. As a significant predator of hard-shelled invertebrates, it plays a vital role in maintaining the health of rocky reef ecosystems by controlling sea urchin populations.

Distribution & habitat

This species is native to the Eastern Atlantic, ranging from Portugal to Morocco and the Azores, and is widespread throughout the Mediterranean. It primarily inhabits rocky bottoms and Posidonia seagrass meadows, typically at depths between 1 and 50 meters.

Appearance

Recognizable by its massive, fusiform body and thick, fleshy lips, the brown wrasse typically displays olive-green, brownish, or blue-green coloration. A key identification feature is the thin, bright blue border along its dorsal, anal, and caudal fins. During the breeding season, males undergo a dramatic transformation, adopting a dark blue color, sometimes accented with light blue spots. Juveniles are generally bright green with a light mid-line running from the eye to the tail.

Biology & behavior

These fish are protogynous hermaphrodites, meaning they begin life as females and can transition into males as they age. While younger individuals may be seen in small groups, adults tend to become more solitary. They are known to reach maturity at approximately two years of age and can live for up to 17 years.

Feeding

As a powerful predator, the brown wrasse feeds on a variety of hard-shelled prey, including sea urchins, mollusks, and crabs. Its diet also includes ophiuroids and various marine worms, which it consumes using its strong jaws.