Orange-lined Cardinalfish

The Taeniamia fucata, known as the orange-lined or painted cardinalfish, is a vibrant marine species native to the rich reef environments stretching from northern 🇦🇺 Australia and 🇵🇬 New Guinea across the 🌊 Indian Ocean to the eastern coast of Africa, as well as into the 🌊 Pacific Ocean, including areas like the 🇲🇭 Marshall Islands, 🇼🇸 Samoa, 🇹🇴 Tonga, and the Ryukyu Islands (🇯🇵 Japan). Before 2013, it was scientifically categorized as Archamia fucata.

This tropical fish is typically found in depths ranging from 2 to 60 meters below the ocean surface, with a maximum length of about 10 centimeters (approximately 4 inches), though it is commonly around 5.9 centimeters (approximately 2.3 inches). They thrive in regions such as the coral and rocky reefs of sheltered bays, lagoons, and mangroves, often amidst coral rubble or sandy and silty bottoms. The orange-lined cardinalfish is known for forming dense groups, particularly at the entrances of underwater caves and among branching corals. Notably, it is a nocturnal species, actively feeding at night.

The fish exhibits distinct and fascinating reproductive behavior. It is a mouthbrooder, meaning that after the eggs are fertilized, the male protects them by holding them in his mouth until they hatch. Courtship involves noticeable pairing between males and females, often accompanied by the males displaying vibrant colors and producing clicking sounds to attract a mate.

Anatomically, the orange-lined cardinalfish is characterized by a series of fins and spines: seven dorsal spines and nine dorsal soft rays, alongside two anal spines and 15 to 18 anal soft rays. Its vibrant and iridescent orange body is highlighted by vivid vertical black or dark brown lines that provide excellent camouflage amidst coral reefs, complemented by a dark spot near the tail’s base that further deters predators.

In terms of feeding, the orange-lined cardinalfish primarily consumes small crustaceans, plankton, and other tiny invertebrates. Their relatively large mouths are adapted to effectively catch prey during their nocturnal hunting within the reefs.

This captivating fish not only enchants aquarium enthusiasts with its striking appearance and fascinating behavior but also plays a vital role in the biodiversity and beauty of its native underwater ecosystems in the Indo-Pacific region. Its name, Taeniamia, reflects the ribbon-like appearance of its body lines, combining Latin and Greek terms that reference its distinctive banded and iridescent coloration.