Facultative air-breathing in the genus ; Ranges from the intertidal zone to 5 m depth, on seaweed beds with pebble bottoms .
Dorsal spines (total): 73 - 81; Dorsal soft rays (total): 0; Anal spines: 2; Anal soft rays: 34 - 41; Vertebrae: 80 - 88. : eel-like.
Behavioural data for Pholis Crassispina is currently being reviewed.
Diet information for Pholis Crassispina is currently being compiled.
Reproduction data for Pholis Crassispina is currently being compiled.
Marine; demersal; depth range 0 - 5 m . Temperate Northwest Pacific: Japan, the Korean Peninsula, and Yellow Sea to the Gulf of Po-Hai (Bo Hai, Chihli), China.
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