Distinctive Characters: Dorsal fin with 12 spines and 16-18 rays. Anal fin with 2 spines and 18-20 rays. Caudal fin segmented with 14 rays. A cirrus from both anterior and posterior rim of nostril.
Colour: Variable. The common pattern is bluish black on head and another half of body, yellow behind. Habitat and Biology: Commonly found resting on - corals and rocks in crevices at depths upto 21 m. Distribution: Central-Pacific to Maldives.
Remarks: The multiple colour phases (3 phases) of Ecsenius bicolor, makes it a favourite with aquarists. The blennies are a large family (over 300 species) of small, agile, bottom-dwelling fishes. The majority of tropical blennies are herbivores. Those for which the reproductive habits are known lay demersal eggs, which are guarded by male parent.