Long-fin Rosy Barb (Pethia conchonius) Breeding Guide

Breeding the long-fin Rosy Barb (Pethia conchonius): sexing by colour and tubercles, conditioning, an egg-trap spawning tank, and rearing fry after a 24-48 hour hatch.

Overview

The Long-fin Rosy Barb is a selectively bred finnage form of Pethia conchonius, a cyprinid distributed from Pakistan through India, Nepal and Bangladesh. Like the wild type it is an egg-scattering free spawner with no parental care. Breeding follows the standard species method; the long fins do not change reproduction but the slower-swimming long-fin fish benefit from calm conditions.

Sexing

Adult males are noticeably smaller, slimmer and more colourful than females, especially during the spawning season, when they also develop tubercles on the head and snout. Females are plainer and deeper-bodied when carrying eggs.

Conditioning

Condition adults together on a varied diet, then transfer selected pairs to the breeding tank once males colour up and females round out with roe.

Breeding Setup

Use a dimly lit breeding tank with mature water. Cover the base with mesh, spawning mops, or fine-leaved plants so eggs fall through while keeping the adults away from them. Maintain slightly acidic to neutral pH at the warmer end of the temperature range, with air-powered sponge filtration for oxygenation.

Spawning Behavior & Trigger

Conditioned pairs scatter eggs over the spawning medium, which fall through out of reach. Warmth and good feeding bring the fish into spawning condition.

Egg & Fry Care

Adults will consume eggs if given the opportunity and should be removed immediately after spawning is observed. Eggs hatch within 24-48 hours, with the fry free-swimming roughly 24 hours later. Begin with infusoria-grade foods for several days before graduating to microworm, Artemia nauplii, or similar.

Common Challenges

Egg predation by the parents is the chief problem, addressed by an egg-trap base and prompt removal. For the long-fin form, avoid fin-nipping tankmates and strong flow so the trailing fins are not damaged during conditioning.