Abstract <p>The article provides illustrated description of early larvae of the stone cockscomb <i>Alectrias alectrolophus</i> from Avacha Bay. Early larvae have a transparent body. Their development is associated with an appearance of complex pigmentation pattern on the body. The pigmentation of juveniles is dark, almost black, the pattern is poorly expressed. During growth, the length of the head and the height of the body decrease relative to the length of the body; the length of the snout, the length of the upper jaw, and the diameter of the eye slightly increase relative to the length of the head; the length of the pectoral fin decreases significantly. Development of larvae and juveniles occurs in the intertidal zone.</p>