Sleepers and marble gobies belong to the Eleotridae family. They are distributed worldwide mostly in tropical and subtropical area. They have separate pelvic fins, or fused to various extents. There are 2-8 flexible dorsal spines and 25 - 28 vertebrae.
There are 33 genera and about 171 species worldwide. Malaysia has about 6 species.
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Scientific Name: Butis gymnopomus (Bleeker, 1853) English Name: Sleeper Goby Local Malay Name: Ikan Ubi Puntong, Puntang, Tungulian Main Identification Features: Flat head, oval shape eyes and elongated body. Yellowish in colour and caudal fin with dark striations. Size: Maximum total length about 12 cm.  Scientific Name: Ophiocara porocephala (Valenciennes, 1837) English Name: Northern Mud Gudgeon, Spangled Gudgeon Local Malay Name: Ikan Ubi Belontok Main Identification Features: Head and body dark. Second dorsal and caudal fin spotted. Size: Maximum total length about 35 cm, commonly 22 cm.   Scientific Name: Oxyeleotris marmorata (Bleeker, 1852) English Name: Marble Goby Mandarin Name | 鱼类中文名: 笋壳鱼 (Sǔn ké yú), 顺壳鱼 (Shùn ké yú), 蓝哥鱼 (Lán gē yú), 林哥鱼 (Lín gē yú) Local Malay Name: Ketutu, Haruan Hantu, Bakut, Ubi Local Hokkien: Soon Hock Main Identification Features: Mouth cleft directed upwards. Colouration variable depending on the habitat. Large dark blotches all over the body. Fins are marked with dark tinges alternate with bright colour. Size: Maximum total length about 65 cm, commonly 30 cm. Remarks: The fish is active at night.     
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