Eight-Line Wrasse (Pseudocheilinus octotaenia): Breeding Notes

Pseudocheilinus octotaenia is a secretive, solitary lined wrasse that has not been bred in captivity. It is a pelagic spawner, so home propagation is not documented.

Overview

Pseudocheilinus octotaenia, the eight-line wrasse, grows to about 14 cm standard length. Wikipedia records it across the Indo-West Pacific from the Comoros and Seychelles to Hawaii, at depths of roughly 2 to 50 metres, where it is a solitary, diurnal carnivore that preys on benthic crustaceans, small molluscs, sea urchins, fish eggs and crab larvae.

Sexing

Like other lined wrasses it is a protogynous hermaphrodite that matures first as female, with dominant individuals becoming male; the largest, most intensely coloured fish is typically the terminal male. External sexing is difficult because the species is shy and rarely seen in the open.

Spawning Behavior & Trigger

Lined wrasses are open-water spawners that pair briefly and ascend to release gametes. The eight-line wrasse is solitary and secretive, sheltering in reef cavities and even forming a mucus cocoon to sleep, which makes natural pairing rare to observe and harder still to stage in a tank.

Egg & Fry Care

Eggs are released into the water column and the larvae are planktonic. No documented method exists for rearing the larvae in captivity, so aquarium specimens are wild-caught, though the species is not commonly traded.

Common Challenges

Its aggression toward similar fish, solitary habit and pelagic eggs are the main barriers. Keeping two adults together risks fighting, and there is no practical way to capture and raise the dispersing planktonic larvae at home.