Yellowlined Cardinalfish

Ostorhinchus chrysotaenia

The Yellowlined Cardinalfish, known scientifically as Ostorhinchus chrysotaenia, is a reef-associated fish found in the Indo-Pacific region. It inhabits areas from Japan to northwestern Australia, including Indonesia and the Solomon Islands, with reports from New Zealand and the Andaman Islands. This species is typically found in shallow waters, residing in inshore reefs, crevices of reef flats, and coral slopes at depths ranging from 0 to 30 meters. It is a nocturnal and solitary species, often seen alone rather than in schools. Identifying the Yellowlined Cardinalfish is relatively straightforward due to its distinctive features. Juveniles display strong stripes, while adults have faint stripes and a notably tall, anteriorly pointed second dorsal fin. Some individuals may exhibit a dark spot on the peduncle, which can change with the fish's mood. Reproduction involves mouthbrooding, with distinct pairing observed during courtship and spawning. The species is assessed as Least Concern on the IUCN Red List. Divers encountering this species may notice its solitary nature and its preference for hiding in crevices during daylight hours.