New-moon cardinalfish (Rhabdamia novaluna), first described by Yoshida, Mabuchi & Motomura, 2018 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. Recorded depth range: 3 to 32 metres. 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): 9; Anal spines: 2; Anal soft rays: 12; Vertebrae: 24. This species is distinguished by the following set of characters: D VI-I, 9; anal-fin rays II,12; pectoral-fin rays 12-13 (usually 13); developed gill rakers 26-31 (modally 28-29); total gill rakers (including rudiments) 27-31 (28); body depth at second dorsal-fin origin 25.5-33.1% of SL (mean 30.2%). Colouration: with a black stripe from jaw tips to anterior margin of orbit; black pigmentation lining the margin of caudal-fin rays; a subdermal black blotch or spot on the lower caudal peduncle; no reddish-brown to blackish blotches on the opercle and anterior portion of body .Cross section: oval.
Behavioural data for New-moon cardinalfish is currently being reviewed.
Marine; reef-associated; depth range 3 - 32 m . Tropical
The following diseases are known to affect New-moon cardinalfish.
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