Malabar Danio (Devario malabaricus) Breeding Guide

Breeding Devario malabaricus: sexing, conditioning, a dimly lit egg-trap spawning tank, a fast 24-36 hour incubation, and feeding the resulting fry to maturity.

Overview

Devario malabaricus is a large, active danioin reaching about 70-80 mm. It is an egg-scattering free spawner with no parental care, and when in good condition it spawns often; in a well-planted, mature aquarium small numbers of fry may even appear without intervention.

Sexing

Sexually mature females should be rounder-bellied, less colourful and a little larger than males. Conditioned, gravid females are the easiest to identify.

Conditioning

Condition the adults together on a varied diet, then move one or two pairs to a separate spawning tank once the females are clearly full of roe.

Breeding Setup

Use a spawning tank with a base of at least 60 by 30 cm, kept dimly lit. Cover the bottom with a mesh or a layer of glass marbles so the eggs fall through out of reach of the adults. Keep the water slightly acidic to neutral with the temperature toward the upper end of the suggested range, and add a sponge filter or air stone for oxygenation.

Spawning Behavior & Trigger

If the fish are ready, spawning usually takes place within 24 hours of introduction, with the female appearing noticeably slimmer afterwards. The adults should be removed after 48 hours.

Egg & Fry Care

Incubation is temperature-dependent but typically lasts 24-36 hours, with the young free-swimming a few days later. Start the fry on Paramecium, progressing to Artemia nauplii and microworm as they grow.

Common Challenges

Because adults will eat the eggs, the egg-trap base and timely removal of the parents are essential. First-feeding fry need genuinely small foods, so culturing Paramecium ahead of the spawn improves survival.