Labracinus cyclophthalmus

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Facts
Latin name Labracinus cyclophthalmus - (Müller & Troschel, 1849)
Local name Sailfin dottyback
Family Pseudochromidae - Labracinus
Origin East Indian Ocean, Australia, Japan, Indonesia, New Zealand, Central/West Pacific
Max length 23 cm (9,1")
As aquarium fish
Minimum volume 300 cm (79 gal)
Hardiness Hardy
Suitable for aquarium Suitable with care
Reef safe Reef safe with caution
Aggressiveness Aggressive towards other species
Feed
Recommended Zooplankton (Cyclops, pods...)
Small crustaceans (Krill, mysis, artemia...)
Larger crustaceans (Shrimp, crabs...)
Fish
Beware of
Jumps out of open aquaria

This species is known to jump out of open aquaria.

Can be a threat to small fish

This spicies might be a threat to smaller fishes.

Can be a threat towards small crustaceans

This species can be a threat towards small crustaceans, e.g. small shrimp.

Aggressive

This species can be extremely aggressive towards other fish.

Be careful when keeping these fish together with peaceful or docile species. Regular feeding, plenty of hiding places and a lot of space can alleviate aggressive behavior to some degree.

Keep in mind
Can coexist as a pair

They can live as a pair provided they are introduced simultaneously.

Hiding places

This species needs good hiding places, for example, between live rocks.

Hermaphroditic

This species can change gender from female to male.

When a male is needed, a female changes sex and takes on the role.

Bred in captivity

This species can be bred in captivity, one can therefore consider asking your local fish store for a captive bred specimen.

Descriptions and further reading
Family description (Pseudochromidae)

Dottybacks (Pseudochromidae) are often very colourful, rather hardy and relatively small, typically under 4 inch (10 cm). These fish can be distinguished from other fish by looking at the shape of the eye, see for example the picture of this: Hawkfish, Surgeonfish, Rabbitfish, Angelfish, Triggerfish, Clown/ Damselfish or Pufferfish.

Dottybacks will compete for food with other fish which eat zooplankton off the rocks. Mandarinfish and similar species can find it difficult to get enough food if kept together with Dottybacks.
One could consider the Gramma species, if one wishes a similar fish which is more peaceful.

FishBase
Aquarium trade Yes
Distribution Western Pacific: widely distributed throughout the Indo-Malayan Archipelago, from southern Japan, south to the Northwest Shelf of Australia, and east to New Ireland, Papua New Guinea.
English common names Darkstriped dottyback
Firetail dottyback
Giant dottyback
References and further reading

About references

Henry C. Schultz. 2002. The Dottybacks - Reefkeeping - (English)
Scott W. Michael. 2001. Basslets, Dottybacks & Hawkfishes: v. 2 (Reef Fishes) - TFH Publications / Microcosm Ltd. - (English)
Bob Fenner. The Dottybacks, Family Pseudochromidae - Wet Web Media - (English)
Collection of links to additional information - Wet Web Media - (English)