Pseudanthias bicolor Breeding Guide

The bicolor anthias is a protogynous harem fish that broadcast-spawns pelagic eggs; it is among the few anthias raised in hatcheries, but its planktonic larvae make home breeding impractical.

Overview

Pseudanthias bicolor is an Indo-Pacific anthias of the family Serranidae that feeds on zooplankton and lives in haremic shoals. It reproduces by broadcast spawning into the open water column. Notably, the bicolor anthias is among the species whose larvae have been captive-raised from eggs collected in plankton nets, though only within dedicated facilities.

Sexing

This anthias is protogynous: fish begin as females and the dominant female changes into a male if the resident male is lost. Harems consist of one dominant, colourful male with two to twelve females and up to two subdominant males. Males display the dramatic two-tone pattern, yellow above and magenta below, that distinguishes the species.

Spawning Behavior & Trigger

The dominant male courts harem females with acrobatic U-swim displays before paired ascents into the water column release gametes. Aquaculture observations on related anthias place spawning near dusk, with buoyant eggs floating at the surface that are gathered using an evening egg collector or plankton net rather than from a nest.

Egg & Fry Care

The eggs are pelagic and hatch into tiny planktonic larvae. In documented work, bicolor anthias larvae were among those reared on copepods, with larvae proving durable when fed appropriately and settling into juveniles roughly a month after hatching. Home reefs cannot replicate the floating egg stage or the continuous live-plankton feeding these larvae require.

Common Challenges

Even though the bicolor anthias is one of only a few anthias to be aquacultured, that success belongs to institutional hatcheries. Wild-caught stock still needs expert quarantine and conditioning to survive, so reproducing the achievement in a home aquarium is not realistic.