All fish / Pomacentridae

Onespot Damselfish

Chrysiptera unimaculata

Also known as onespot demoiselle, one spot damsel, one-spot damselfish, olive damsel, yellowfin damsel, ヒレナガスズメダイ, betok, 单斑金翅雀鲷

A small, hardy damselfish that lives on shallow reef flats. Adults are olive brown with pale or yellowish fins. Juveniles have a black eye-spot near the back of the dorsal fin, which fades with age. Keepers like it because it tolerates a wide range of conditions and grazes on algae.

Care at a glance

Care level

Easy

Temperament

Aggressive

Adult size

7 cm

Temperature

24 to 28 °C

pH

8.1 to 8.4

Smallest tank

120 litres

Keep as

Singly or as a pair in a larger tank

Diet

Omnivore: algae, marine flakes and pellets, mysis and brine shrimp

Swims

Middle of the tank

Lifespan

5 to 10 years

Water

Marine (saltwater)

Wild range

Indo-West Pacific: Red Sea and East Africa to Indonesia, Philippines, northern Australia and Fiji

Breeding

Pairs lay eggs on hard surfaces and the male guards them until they hatch. Spawning happens fairly readily in aquariums, but rearing the tiny pelagic larvae is hard.

Good to know

Like many damsels it becomes territorial as it ages, so house it with robust tankmates and add it last. It can be confused with other drab brown Chrysiptera species.