Occurs in streams with moderate to fast flow in shallow areas of gravel (depth 0.3-0.7 m) just above tidal influence, in company with Schismatogobius bruynisi and S. vanuatuensis .
Dorsal spines (total): 7; Dorsal soft rays (total): 9; Anal spines: 1; Anal soft rays: 8 - 9. Schismatogobius essi is distinguished by having the following characters: pectoral fin usually with 15 pectoral; pectoral fins with broad black triangular wedge dorsally usually with few rows of dark spots below it; dorsal flns VI-I,9; membrane in flrst dorsal fin posterior to spine 6 not connected to base of spine in second dorsal fln; anal fln I,8-9; ventral surface ofhead, frenum and pelvic disc in male entirely blackish or entirely brownish; and in females, underside of head pale with chin and surrounding area blackish, with diffuse dark brown area on anterior part of branchiostegal membrane and isthmus .: elongated.
Behavioural data for Schismatogobius Essi is currently being reviewed.
Freshwater; demersal. Tropical
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