Peppered Corydoras Breeding Guide

How to breed peppered corydoras (Corydoras paleatus): sexing, a cool-water-change trigger, the T-position spawn, and rearing the fry.

Overview

The peppered corydoras (Corydoras paleatus) is a hardy bottom-dwelling catfish from the lower Paraná River basin in Paraguay, Argentina and Brazil, reaching about 6-7 cm. It is an egg-laying species that spawns in the characteristic T-position and is one of the easiest Corydoras to breed.

Sexing

Females grow considerably bigger and are much more rounded, especially when in breeding condition; the difference is clearest viewed from above. Males remain slimmer.

Conditioning

Feed plenty of live or frozen foods such as bloodworm to bring the group into condition. A ratio of at least two males per female improves fertilisation rates.

Breeding Setup

A breeding tank of around 18 x 12 x 12 inches works well. The key trigger is a large water change using water roughly 5 C cooler than the tank, simulating cool rain; this may need repeating over several days to initiate spawning.

Spawning Behavior & Trigger

The pair adopt the T-shaped spawning position with interlocking pelvic fins; in this position the male releases sperm and the female holds a clutch of eggs between her pelvic fins for fertilisation, then deposits them on the glass or on plant leaves. Fish swimming repeatedly at the glass signal imminent spawning. A spawning may yield about 50 to 150 eggs, and several hundred when multiple pairs spawn together.

Egg & Fry Care

Eggs are about 1.8 mm in diameter and hatch in roughly 3-4 days, with incubation averaging about 102 hours (around 4.25 days) at 24 C and hatching success averaging close to 87%. Newly hatched fry are very small; once their yolk sacs are absorbed, feed microworm, then progress to powdered foods and brine shrimp nauplii. Maintain excellent water quality and avoid siphoning up fry.

Common Challenges

Adults and other tankmates will eat eggs, so eggs or adults are usually separated. Fungus on infertile or stressed eggs is common; many breeders use antifungal additives or alder cones to protect a clutch.