Indian Glassfish Breeding Guide

How to breed Parambassis ranga, an egg-scattering glassfish whose eggs hatch in about 24 hours; fry are demanding because they wait for drifting food.

Overview

Parambassis ranga is a small schooling fish of the family Ambassidae with a near-transparent body, distributed across South Asia from Pakistan to Bangladesh and the wider region. It breeds prolifically during the rainy season in nature and is an egg-scatterer of intermediate difficulty in the aquarium. Dyed specimens marketed as novelty fish should be avoided, as the injection process damages the fish.

Sexing

Males develop a dark to blue edging on the dorsal and anal fins and a more pointed rear margin of the swim bladder, while females have rounder bodies that become noticeably swollen during the breeding season.

Conditioning

Condition a group of around 6-8 adults on a high-quality, varied diet in a densely planted tank held at roughly 21-24 °C with near-neutral pH. Exposure to morning sunlight is reported to be advantageous. Readiness is signalled by intensified male colour and swollen female bellies.

Breeding Setup

Provide a densely planted aquarium, since the eggs are scattered among vegetation. Fine-leaved plants give the eggs a surface to adhere to and make collection of the spawn easier.

Spawning Behavior & Trigger

Spawning is triggered by a large evening water change using warmer water in the region of 27-29 °C. The fish typically spawn the following morning, and each pair may deposit up to around 200 eggs scattered among plants.

Egg & Fry Care

The eggs are prone to fungus and benefit from treatment with methylene blue. They hatch in approximately 24 hours, and the fry become free-swimming three to four days later. Fry are difficult to raise because they do not actively hunt but wait for food to drift to them; heavy feeding with brine shrimp nauplii, slow water currents and frequent small water changes are required. Maintaining the spawning warmth and gentle flow throughout the early larval period is important for survival.

Common Challenges

The passive feeding strategy of the fry is the main obstacle, demanding continuous availability of suitably small live food and very gentle flow. Fungus on eggs and poor water quality during the larval stage are the most common causes of loss.