Saltcorner
By Bob Goemans
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Dascyllus

Dascyllus trimaculatus

(Ruppell, 1828)

Threespot Dascyllus, Domino Damselfish

Likely Reef Tank Suitable

Likely Fish-Only Tank Suitable

Range: Indo-West Pacific Ocean: Red Sea and East Africa to Line and Pitcairn Islands, north to Southern Japan, and south to Lord Howe Island.

Size: 6 inches (14 cm)

Natural Environment: Inhabits lagoon patch reefs, back reefs, reef faces and fore-reef slopes at depths between 3 to about 180 feet (1 – 55 m) and mainly feeds on planktonic crustaceans (copepods, mysis, and shrimp larvae), fish eggs and filamentous algae.

General Husbandry: Fairly common in the trade, yet not a peaceful community fish and one of the largest in this genus. Juveniles have a black body and fins, with one white spot on the head, and one on either side of the upper mid body, hence the common name – Threespot Dascyllus. As they grow into adulthood, they become quite drab and usually lose the white spots.

Best housed with dottybacks, large angelfishes and surgeonfishes, and triggerfishes.

As to diet, a meaty diet, e.g., live fortified brine shrimp and/or finely chopped various frozen or fresh meaty foods such as mysis, squid, fish flesh, shrimp, clam and plant material, e.g., flake foods, especially those containing Spirulina should be offered several times daily.

Taxonomy:

    Order: Perciformes

    Suborder: Labroidei

    Family: Pomacentridae

    Subfamily: Chrominae

    Genus: Dascyllus

FYI: Juveniles can be maintained in small groups, yet as they age, will quarrel with each other, and tankmates even if they are also quite feisty.

Cute when small, but devils when they mature. Think twice before putting these in your aquarium!

Expansive growths of branching stony corals provide this species a more appropriate environment.

Experience Level: Intermediate

Temperament: Feisty/belligerent

Diet: Omnivore

Coral Safe: Yes

Invertebrate Safe: With caution

Acclimation Time: 30 minutes+

Aquarium Environment: Reef or fish-only aquarium

Tankmates: Aggressive

Minimum Tank Size: 75 gallons

Temperature Range: 74 - 84°F (23 – 28°C)

Specific Gravity: 1.020 - 1.026

pH: 8.0 - 8.5

 Dascyllus trimaculatus (Threespot Dascyllus, Domino Damselfish)
Photo © David Cook & Robert Patzner
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