Breeding Clownfish
How to breed Ocellaris Clownfish (Amphiprion ocellaris): protandrous pairing, eggs laid near the host, male egg-tending, and demanding rotifer-fed larval rearing.
Overview
Ocellaris Clownfish (Amphiprion ocellaris) is a substrate-spawning marine fish of intermediate breeding difficulty. It is among the more attainable marine species to spawn at home, though raising the larvae requires live rotifers and a dedicated rearing setup.
Sexing & Pairing
All anemonefish are protandrous hermaphrodites, meaning they first develop into males and may become females later in life. Within a group the female is the dominant and largest member, followed by the dominant male, while other individuals remain non-reproductive. If the dominant female is removed, the dominant male becomes the female and the next-highest-ranked male becomes the dominant male. A pair therefore forms naturally from a compatible group as the largest fish transitions to female.
Breeding Setup
- A stable marine system within the species range of 24-28 °C and pH 8.0-8.4
- A host anemone or a flat surface near shelter where the male can prepare a nest
- A separate larval rearing tank with a heater and gentle water movement, avoiding mechanical filters and protein skimmers that would harm larvae
- An established culture of live rotifers (Brachionus plicatilis) plus Artemia
Spawning Behavior & Trigger
Males become more aggressive during spawning, with displays including biting, chasing and fin extension. The male prepares the nest near the anemone so its tentacles can help protect the eggs, and the female lays eggs for about one to two hours on the cleaned surface. The eggs are elliptical and adhesive.
Egg & Larval Care
The male usually cares for the eggs, fanning them and removing fungus-infected or infertile eggs. Eggs take approximately six to eight days to hatch, a period affected by water temperature; at 28 °C hatching takes about eight days, typically within a few hours after the lights go out. From hatch through about day 7 the larvae are fed the rotifer Brachionus plicatilis enriched with phytoplankton at a density of roughly 10 rotifers per mL, later graduating to Artemia.
Common Challenges
The main difficulty is the live-food supply: without time and resources to culture adequate numbers of rotifers, the larvae cannot be raised in any numbers. The larval tank must also avoid skimmers and mechanical filters that would kill the tiny larvae.