Baillon's Wrasse

Overview

Baillon's wrasse (Symphodus bailloni) is a marine fish species native to the eastern Atlantic Ocean, ranging from the British Isles and Belgium down to Mauritania, as well as parts of the western Mediterranean Sea. It is a relatively small, reef-associated fish typically found in coastal waters.

Distribution & habitat

This species primarily inhabits the littoral zone, favoring environments with abundant weed growth, seagrass beds, and rocky substrates. While most common in the eastern Atlantic, it has also been recorded in the western Mediterranean, including areas off the coast of Spain and the Balearic Islands.

Appearance

Baillon's wrasse has an elongated, laterally compressed body, typically reaching a standard length of around 18 cm, though it can grow up to 20–23 cm. Its coloration is generally dominated by brown tones, with three longitudinal lines of irregular dark spots along its flanks. A key diagnostic feature is its well-developed upper lip, which protrudes significantly beyond the lower lip. During the breeding season, males exhibit more vibrant colors, featuring green and orange-red patterns, along with orange markings on a bluish background near the eyes. The tail base is notably broad and may occasionally feature a small, dark spot.

Biology & behavior

This species is oviparous and exhibits distinct pairing during its breeding cycle. Males are known to construct dish-shaped nests, which they actively guard to protect the developing eggs. It is generally considered a harmless, reef-associated fish that occupies a similar ecological niche to other wrasse species in its range.