Meiacanthus atrodorsalis Breeding Guide

Meiacanthus atrodorsalis is a venomous fang blenny that lays demersal eggs in PVC shelters under male care and whose larvae have been reared in published studies. This guide covers pairing, conditioning, spawning and larval rearing.

Overview

Meiacanthus atrodorsalis is a fang blenny of the western Pacific coral reefs, growing to about 11 cm and described by Günther in 1877 (Wikipedia). It carries a venomous bite delivered through grooved canine fangs, which deters predators, and it is established in the aquarium trade as one of the fang blennies that is widely captive-bred.

Sexing

External sexing is not strongly marked, and breeders typically work with small harems rather than pre-sexed pairs. In a published study two harems of six fish were used, and the male takes full responsibility for egg care (search of ScienceDirect study summary), so a guarding male in a shelter is the practical sign of a functioning breeding unit.

Conditioning

Conditioning relies on stable reef parameters and regular feeding of small meaty and prepared foods. Captive-reared forktail blennies wean readily onto formulated diets, with one study weaning juveniles successfully between 16 and 30 days post-hatch (search of ScienceDirect study summary), so a varied diet keeps a breeding harem in good condition.

Breeding Setup

A breeding setup provides single-entrance tube shelters as spawning sites: adults showed a preference for 50 mm single-entrance PVC pipe for egg laying (search of ScienceDirect study summary). Stable reef water, modest flow and several such tubes per harem give males defensible nest sites.

Spawning Behavior & Trigger

In the published account, harems began spawning about three months after acquisition, with egg clutches found regularly thereafter, and the male took full responsibility for egg care (search of ScienceDirect study summary). Eggs are demersal and attached inside the tube; stable conditions and good condition sustain repeated clutches rather than a single trigger event.

Egg & Fry Care

The male tends the attached eggs in the tube until hatching: larvae of about 3.11 mm standard length hatched roughly 181 hours after fertilisation at 28 °C, with larval survival ranging from about 4.8 to 47 percent (search of ScienceDirect study summary). The pelagic larvae are reared on live prey before weaning, which makes this species genuinely raisable in captivity.

Common Challenges

The venomous fang means careful handling, though the fish is peaceful toward tankmates. Larval survival is variable, so consistent live-food culture and water quality during the roughly week-long egg phase and the pelagic larval period are the main determinants of yield.