Sun Catfish Breeding Guide

Why Horabagrus brachysoma is unrecorded in the home aquarium and is instead reproduced through induced spawning in aquaculture and conservation hatcheries.

Overview

The sun catfish (Horabagrus brachysoma) is a bagrid endemic to Kerala in south-western India, growing to as much as 45 cm standard length. Despite often being sold at 2-3 inches, it is a large fish, and its reproduction in the home aquarium is unrecorded.

Breeding Setup

Institutional breeding of this endangered species relies on hatchery facilities rather than display tanks. Maintenance conditions for the fish are 23-25 °C, pH 6.0-7.5 and 5-25 dH, but these do not on their own induce spawning in aquaria.

Spawning Behavior & Trigger

In aquaculture, females are induced to spawn with the synthetic hormone ovaprim at roughly 0.8-1.5 ml per kg of body weight, with a latency of about 13-20 hours. Induced fish then spawn naturally within 8-14 hours, and the fertilised eggs hatch in about 22-29 hours.

Egg & Fry Care

Hatchery programmes report fecundity on the order of 1.6-1.8 lakh (160,000-180,000) eggs per kg of body weight, with fertilisation rates of about 50-81% and hatching rates of about 27-68%. Fry rearing is carried out under controlled hatchery conditions; comparable home-aquarium fry data do not exist.

Common Challenges

The species' large adult size and the need for hormone induction put breeding beyond the reach of typical hobbyists. The sun catfish is best regarded as a display fish, and captive-bred conservation stock is preferable to wild-caught given its threatened status.