Fish from the family Malacanthidae have streamlined bodies and large crests on their head. They have relatively long dorsal fins and anal fins. The blue blanquillo gets its name from its mainly blue colour. It also has some shades of yellow, and can change colour in different situations. On their backs, there is a set of stripes that run across its body. Their belly is white. The colour of the head changes from a light blue to a pinkish mix during spawning season.