The image shown is a representative illustration and does not depict every individual animal in this category.
Total number of species approx.: 370
Cardinalfishes are small, colorful reef fish commonly found in tropical and subtropical waters, especially in the Indo-Pacific. Often seen near coral branches or hiding under ledges, these fish are most active at dusk or night, hovering in small groups as they feed on plankton.
What makes them truly fascinating is their mouthbrooding behavior. After mating, the male carries the fertilized eggs—and sometimes even newly hatched juveniles—in his mouth, protecting them until they’re ready to swim freely. Observing this rare act of underwater parenting is a rewarding moment for patient divers. Cardinalfishes display a variety of patterns, from bold stripes to translucent bodies, and often reflect dive lights with their striking eyes. Whether on a dusk dive or peeking under coral, these tiny guardians offer a glimpse into the intricate and hidden dramas of reef life.
