Istiblennius dussumieri, the streaky rockskipper, is a species of combtooth blenny found in coral reefs in the western Pacific and Indian Oceans.

Istiblennius dussumieri is dusky in colour marked with six to seven irregular double dusky bars on the flanks, there is a dark spot on the anterior part of the dorsal fin between the first two spines, and it has further dark spots on the dorsal and caudal fins.

Its range extends from the Cape of Good Hope eastwards through the Indian Oceamn and the western Pacific as far as Palau.

[1] Istiblennius dussumieri occurs along very shallow rocky coasts, frequently in the intertidal zone where the water is less than 1 metre (3.3 ft) deep.

They are oviparous and form pairs, the eggs adhere to the substrate while the planktonic larvae are found in shallow, coastal waters.