Molly Miller

Overview

The Molly Miller (Scartella cristata) is a small, resilient marine fish belonging to the combtooth blenny family. Known for its engaging personality and utility as an algae grazer, this species is frequently observed perching on rocks or hiding within crevices in shallow coastal waters.

Distribution & habitat

This species has a wide, cosmopolitan distribution across tropical, subtropical, and temperate seas. It is found throughout the Western and Eastern Atlantic, the Mediterranean Sea, and the Northwest Pacific. They primarily inhabit shallow rocky areas, tide pools, and coral reefs, typically at depths of 0 to 10 meters, where they utilize holes, empty shells, or rock crevices for shelter.

Appearance

The Molly Miller features an elongated, scaleless body with a mottled color pattern of cream, olive green, grey, and brown, often marked with dark or reddish bars that provide excellent camouflage. A defining characteristic is the presence of hair-like appendages, or cirri, located above the eyes, nostrils, and along the nape, which can form a crest. They possess large, prominent eyes and a relatively broad head.

Biology & behavior

These fish are primarily benthic, spending most of their time on the substrate due to their poorly developed swim bladders. They are generally solitary or found in small groups and are known for their alert, curious behavior. The species is oviparous, with males often guarding adhesive, demersal eggs deposited in nests such as empty barnacle shells or rock cavities.

Feeding

Primarily an omnivore, the Molly Miller feeds heavily on filamentous algae, diatoms, and detritus found on rocky surfaces. Juveniles may consume a higher proportion of small invertebrates, while adults shift toward a more algae-based diet, using their comb-like teeth to graze.