Gymnapogon Japonicus (Gymnapogon japonicus), first described by Regan, 1905 is a small fish in the family Apogonidae (order Apogoniformes). Adults typically reach 5.00 cm in maximum length. It inhabits marine coastal and open-ocean environments. It occurs in Tropical waters. It feeds on a mix of small fish and invertebrates as a mid-level predator. On the IUCN Red List, it is classified as Least Concern.The species is kept in the aquarium hobby. Care requirements and behaviour align broadly with other Apogonidae kept in the hobby.
Dorsal spines (total): 7; Dorsal soft rays (total): 10; Anal spines: 2; Anal soft rays: 9. Body similar to gobioid fishes. No scales on body, but with many well-developed pit organs on head and body. The fan-like caudal fin has many procurrent rays. There is a single downward short spine on the preopercular edge, and many dark-brownish pigments on the caudal peduncle.: elongated; Cross section: compressed.
Behavioural data for Gymnapogon Japonicus is currently being reviewed.
Distinct pairing during courtship and spawning .
Marine; benthopelagic. Tropical
The following diseases are known to affect Gymnapogon Japonicus.
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