Christmas wrasse

Lore & Background

The Christmas wrasse was first formally described as Labrus trilobatus in 1801 by the French naturalist Bernard Germain de Lacépède, with the type locality given as Mauritius. It is also known as the ladder wrasse, green-barred wrasse, or green-blocked wrasse. The species exhibits sexual dimorphism: females are greenish grey to pale green with 5–6 dark blotches on the back, a pair of indistinct dark stripes on the flank, and a diagonal or C-shaped pink to dark red marking below the front of the eye. Males in terminal phase have a salmon-pink to orange body toward the head, with two horizontal series of green rectangles; the head is orange-brown without bands, and the tail is brownish to greenish with blue rays in the last third. The caudal fin in females may be slightly rounded or truncate, while in males it can be truncate or a little double emarginated. This fish is similar to the surge wrasse (Thalassoma purpureum) but is distinguished by the spotted head of females, the lack of a V-shaped mark on the snout, and the head color in males.

Reader's Guide

The Christmas wrasse holds a modest but recognized place in human usage. It is a commercially important species in the aquarium trade, although its size—growing up to 30 cm in total length—makes it too large for most home aquaria. Beyond the pet trade, it is of only minor and local interest to artisanal and subsistence fisheries. Ecologically, it is a carnivorous species found at wave-exposed reef margins and reef flats, where it feeds on small invertebrates such as crabs, molluscs, and brittle stars; the youngest fish mainly consume small benthic invertebrates. Its wide Indo-Pacific distribution, from the east coast of Africa to Pitcairn Island and from the Ryukyu Islands to northern New South Wales, underscores its adaptability to shallow, wave-swept environments. The species is oviparous, with males and females pairing to spawn, and the larval stage lasts from 60 to 99 days. Despite its limited economic impact, the Christmas wrasse contributes to the biodiversity of reef ecosystems and remains a recognizable member of the wrasse family in its range.

Did You Know?

• The Christmas wrasse has 8 spines and 13 soft rays in its dorsal fin.
• It is distinguished from the surge wrasse by the spotted head of females and the lack of a V-shaped mark on the snout.