Saddleback Clownfish (Amphiprion ephippium) Breeding Guide

How to breed the red saddleback clownfish Amphiprion ephippium: forming a pair, demersal eggs near a host anemone, male tending and rearing the pelagic larvae.

Overview

Amphiprion ephippium is a demersal egg-laying anemonefish bred in captivity in the same way as other clownfish. It forms a distinct breeding pair and is a protandrous hermaphrodite, with the largest fish becoming the female and the breeding male changing sex if she is lost. FishBase records it as oviparous with distinct pairing, eggs demersal and adhering to the substrate, with the male guarding and aerating them.

Sexing

Colour does not indicate sex in this species; within an established pair the female is the larger fish and the breeding male is smaller. A single specimen is functionally male and will become female when paired with a smaller individual. Raising two juveniles together and allowing the dominant fish to mature into the female is the simplest way to obtain a compatible pair.

Conditioning

Feed the pair frequently on varied marine foods and keep water stable to support egg production. The species naturally occurs in silty coastal waters and protected bays, typically in pairs, and associates with the anemones Entacmaea quadricolor and Heteractis crispa; providing a host anemone reduces stress and encourages a settled spawning routine.

Breeding Setup

Give the pair their own territory with a flat hard surface near the host anemone, where the female will deposit eggs on a cleaned patch of rock. Maintain stable reef conditions; the record lists about 24-26 degrees Celsius and pH 8.1-8.4, and FishBase gives a wild depth of roughly 2-15 m. The pair clean and guard the nest site before spawning.

Spawning Behavior & Trigger

The female lays a clutch of conical eggs (clownfish clutches reach up to about a thousand eggs, each 3-4 mm long) which the male fertilises and then tends, cleaning, guarding and fanning the eggs with his pectoral fins. The eggs begin bright orange and darken as the embryos and their eyes develop. Settled, well-conditioned pairs spawn on a regular repeating cycle.

Egg & Fry Care

Incubation lasts six to seven days and the larvae hatch at night. The newly hatched larvae go through a pelagic stage of up to about 12 days before settling, during which they must be reared in a dedicated tank on appropriately small first foods such as rotifers, moving to larger live foods as they grow. They are far too small for adult food at hatching.

Common Challenges

As with all clownfish the larval stage is the bottleneck: the tiny pelagic larvae need clean rearing water and correctly sized live first foods or losses are severe. The species is semi-aggressive, so an unsuitable pairing can result in conflict. Moving the egg-laden rock or the freshly hatched larvae to a separate rearing tank protects them from predation in the display.