Zesticelus Bathybius (Zesticelus bathybius), first described by Günther, 1878 is a tiny fish in the family Cottidae (order Perciformes). Adults typically reach 4.70 cm in maximum length. It inhabits marine coastal and open-ocean environments. Recorded depth range: 700 to 1270 metres. It occurs in Deep-water waters. It is broadly omnivorous, taking invertebrates, plant matter, and detritus. On the IUCN Red List, it is classified as Data Deficient.
Dorsal spines (total): 5 - 7; Dorsal soft rays (total): 10 - 11; Anal spines: 0; Anal soft rays: 7 - 8.
Behavioural data for Zesticelus Bathybius is currently being reviewed.
Marine; bathydemersal; depth range 700 - 1270 m . Deep-water Northwest Pacific: Japan.
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