Trachinops Noarlungae. The Yellowhead hulafish is named for the yellow coloring on its head and its dance-like movements in the water. Yellow can also be seen on the base of the dorsal fin and the caudal fin that has a blue edge. The overall color of the elongated body is gray above and pale on the underside. This relatively small species reaches a length of only four inches (10.2 cm). They are generally found in schools on coastal reefs, often at the entrance of a cave or overhangs. They feed on crabs, fish and larvae. Females produce a large egg mass that is guarded by the male parent until hatching. These fish are often found under jetties or on rocky reefs. They are endemic to the temperate waters of Southern and Western Australia.