Monaco Shrimp

Overview

The Monaco shrimp (Lysmata seticaudata) is a small, nocturnal marine crustacean widely recognized for its role as a cleaner shrimp. It is frequently observed in groups, often interacting with various fish species by removing parasites and dead tissue from their bodies.

Distribution & habitat

This species is primarily found in the Mediterranean Sea and the temperate waters of the eastern Atlantic, ranging from the Bay of Biscay and the English Channel down to Morocco. It typically inhabits rocky substrates at depths between 4 and 60 meters, where it seeks shelter in crevices, caves, and fissures during the day.

Appearance

Typically reaching lengths of 3 to 7 centimeters, this shrimp features an elongated body with a distinct color pattern that shifts between day and night. During the day, it displays longitudinal red lines bordered by white, while at night, its appearance changes to show more prominent dark transverse bands. It possesses long, sensitive antennae and a relatively short rostrum.

Biology & behavior

Lysmata seticaudata is a protandric simultaneous hermaphrodite, meaning individuals function as both males and females. They are largely nocturnal, emerging from their rocky retreats after dark to forage and reproduce. They are known to be social, often congregating in significant numbers within their chosen crevices. Their cleaning behavior is a vital ecological interaction, benefiting both the shrimp, which gains a food source, and the host fish, which receives a health service.

Feeding

As a cleaner and scavenger, its diet consists of parasites, dead skin, and organic debris collected from fish and other marine organisms. In aquarium settings, it is also noted for its ability to help control populations of Aiptasia sea anemones.