The northern yellow-black triplefin (Enneapterygius gracilis), also known as the northern Australian yellow-black triplefin, is a species of triplefin blenny in the genus Enneapterygius. It was described by German Ichthyologist Ronald Fricke in 1994.Fricke, R., 1994 [ref. 21827] Tripterygiid fishes of Australia, New Zealand and the southwest Pacific Ocean (Teleostei). Theses Zoologicae v. 24: i-ix + 1-585. It is a tropical blenny, endemic to northern Australia, in the western Pacific and southeastern Indian Oceans. It is a non-migratory species which dwells in shallow tidal pools on coralline rock and in seagrass, and has been recorded swimming at a depth range of . Male northern yellow-black triplefins can reach a maximum length of 2.8 centimetres (1.06 inches).
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