Filamented Flasher Wrasse (Paracheilinus filamentosus): Breeding Notes

Paracheilinus filamentosus is a haremic Indo-Pacific flasher wrasse whose males spawn through dusk flashing displays and release pelagic eggs, making home breeding impractical.

Overview

Paracheilinus filamentosus is one of the larger flasher wrasses, reaching about 15 cm according to FishBase. It ranges widely across the Indo-Pacific over rubble areas in passages, outer reef slopes and lagoons at depths of roughly 5 to 35 metres, where it feeds on zooplankton and small benthic invertebrates.

Sexing

Males are easily told apart by their dramatically prolonged dorsal fin rays, which give the species its name, while females show little or no prolongation. FishBase notes that the fish occurs in small to large mixed-sex groups in which females greatly outnumber males, a haremic arrangement.

Spawning Behavior & Trigger

FishBase describes how males readily display to each other and to females, flashing their colours and racing past with erected fins. The display peaks around dusk; receptive females and the dominant male ascend briefly to release gametes into the water column.

Egg & Fry Care

Spawning is oviparous with pelagic eggs that disperse into the plankton. There is no established captive-rearing method for the planktonic larvae, so trade animals come from wild collection rather than aquaculture.

Common Challenges

Reproducing the courtship requires open swimming space, a stable harem ratio and a natural dusk light cycle. Even when adults display in captivity, the buoyant eggs and extended larval phase make rearing fry beyond the scope of typical home setups.