Appearance
Gymnocranius grandoculis has an oblong body that has a depth which fits into its standard length around two and a half times. The head has a moderately sloping dorsal profile with the larger adults having a bony ridge on the nape and a bony shelf oabove the anterior part of the eye. The eye is placed high on the head and is relatively large, although its diameter is a little less than the length of the snout. The continuous dorsal fin is supported by 10 spines and 10 soft rays while the anal fin contains 2 spines and 10 soft rays. The teeth in the jaws are conical at the front and are bristle-like to conical at the sides. The caudal fin is moderately fork with pointed lobes. The overall colour is golden brown to yellowish with wavy blue lines and spots on the head in front of the eye, the cheek and the operculum. The fins are yellowish-orange and the caudal fin has an orange margin.

