Leopold's Angelfish Breeding Guide

Breeding Pterophyllum leopoldi, the smallest angelfish: substrate spawning on vertical surfaces and biparental care, with notes on its difficulty.

Overview

Leopold's angelfish (Pterophyllum leopoldi) is the smallest angelfish, reaching about 10 cm SL, and is native to the Amazon River (between Manacapuru and Santarém), the Essequibo and the Rupununi. It is distinguished by the absence of a pre-dorsal notch and a black blotch at the dorsal insertion on the fourth vertical bar. It is a substrate spawner but is regarded as notably difficult to breed in aquaria. Breeding behaviour described here follows the genus Pterophyllum.

Sexing

It is very difficult to accurately identify the sex of any Pterophyllum individual until it is nearly ready to breed and the breeding tubes appear. Allowing a group to pair off naturally is the usual approach.

Breeding Setup

• Soft, slightly acidic water in line with its Amazonian range
• A vertical spawning surface such as a broad leaf, slate or piece of wood
• A quiet, stable tank to encourage a settled pair

Spawning Behavior & Trigger

In Pterophyllum, eggs are usually laid on a submerged log, a flattened leaf or even filter piping in aquaria. The pair spends one or two days picking detritus and algae off the chosen surface; the female then deposits a line of eggs followed by the male fertilising them, repeating until the clutch is laid.

Egg & Fry Care

Both parents provide highly developed brood care, fanning the eggs with their pectoral fins to keep water circulating. The eggs hatch within a few days and the fry remain attached to the spawning substrate, detaching to become free-swimming after about a week, when they can be offered appropriately sized live food.

Common Challenges

P. leopoldi is uncommon in the hobby and notably difficult to breed. Sexing is unreliable until spawning, and pairs may eat early clutches before establishing consistent parental care.