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Butis humeralis
Eleotridae
Olive-flathead gudgeon
黑點嵴塘鱧
© Jeffery C.F. Chan
Size
Typically, 5 – 15cm encountered in Hong Kong.
Identification
Elongated body with a dorsally compressed head and large mouth. Yellow-brown coloration across the head and body. Black blotch at pectoral fin base surrounded by two orange blotches. Orange margins at the lower margins of pelvic, anal, and caudal fins. Previously misidentified as Butis melanostigma.
Description
Amphidromous species, with juveniles entering small streams and large rivers to reside and reproduce. Found more common in estuaries and lower reaches of low-elevation streams. Often found perched on sunken wood and sometimes hanging upside down.
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