Corydoras armatus Breeding Guide

How to breed the long-snouted Corydoras armatus: sexing, conditioning, the cooler-water spawning trigger, T-position pairing and fry care, based on the documented genus pattern.

Overview

Corydoras armatus is a long-snouted armoured catfish reaching about 60-65 mm standard length. Its type locality lies in the Jeberos district (Alto Amazonas) and Huallaga province of Peru; it may be endemic to the Rio Huallaga watershed, with additional records from the upper Rio Madeira system in Brazil and Bolivia (Seriously Fish). It is a peaceful, facultative air-breathing egg-depositor. No species-specific spawning reports are available, so the procedure below follows the genus pattern and species figures are approximate.

Sexing

Females grow larger and become noticeably rounder and broader-bodied than males when sexually mature, especially when gravid (Seriously Fish). The fuller female body is most apparent from above.

Conditioning

The species is a foraging omnivore that accepts sinking dried foods, bloodworm and Tubifex, and should not be relied upon as a tank cleaner (Seriously Fish). Conditioning on varied live and frozen foods builds females into spawning condition. Keep the group at four to six or more individuals.

Breeding Setup

Provide a separate tank with fine sand or a bare base, gentle sponge filtration and fine-leaved plants or spawning mops. Hold the water within the tolerated range of pH 6.0-7.5 and roughly 22-26 degrees C (Seriously Fish).

Spawning Behavior & Trigger

Genus spawning is triggered by a large (50-70%) cooler water change with raised oxygenation and flow, repeated daily until the fish respond; this simulates the rainy season. In the T-position the male clasps the female's barbels while she cups eggs in a pelvic-fin basket and gathers milt, then attaches sticky eggs to glass, leaves or a mop in successive passes. Egg counts specific to C. armatus are not documented in the consulted sources.

Egg & Fry Care

Adults predate eggs, so separate the parents or the eggs after spawning. Genus eggs hatch in about 3-5 days; fry take microworm and newly hatched brine shrimp once the yolk sac is absorbed. Maintain excellent water quality during rearing, ideally over a thin sand layer with frequent small water changes.

Common Challenges

Conditioning females, providing a reliable cool-water trigger and protecting eggs from predation are the principal hurdles. As a facultative air-breather the adult is hardy, but egg fungus on infertile eggs and unstable fry-stage water quality still cause most losses, so hygiene during the egg and early fry stages is essential.