Aequidens diadema Breeding Guide

Breeding Aequidens diadema, a substrate-spawning acara that lays 200-300 eggs on flat stone and rears fry with both parents.

Overview

Aequidens diadema is a South American acara from the Rio Negro region of Brazil and Venezuela, reaching about 20 cm in length. It is a substrate spawner that breeds in pairs and shows pronounced biparental care, mouth-sheltering free-swimming fry when threatened.

Sexing

The species is shy and best kept and bred as a bonded pair. As with related acaras, sexing is not always obvious in juveniles, so growing on a group and allowing a pair to form is the reliable route to a compatible breeding pair.

Conditioning

Aequidens diadema is omnivorous and benefits from protein-rich live or frozen foods to bring a pair into condition. House the pair with calm tank mates, because this acara is described as fairly peaceful but easily intimidated.

Breeding Setup

Provide a flat stone for spawning over a sand or fine-gravel base, with driftwood and rock to define a territory. Reported aquarium parameters are a temperature of 23-28 C, pH around 7.0-7.5 and general hardness of 8-12 dGH.

Spawning Behavior & Trigger

Spawning is reported to be straightforward: the pair lays 200 to 300 eggs on a cleaned flat stone, which are then fertilized. The female tends and fans the clutch on the substrate.

Egg & Fry Care

The eggs hatch after about 2 days, after which both parents take the young into their mouths for further sheltering. The fry swim freely after roughly 8 days and can be raised on brine shrimp (Artemia) nauplii. Both parents continue to guard the school.

Common Challenges

Mild aggression appears around spawning, so unsuitable or restless tank mates can disturb a shy pair and cause them to abandon a clutch. A quiet, well-structured tank improves rearing success.