Maroon Clownfish

Maroon Clownfish

The Maroon Clownfish (Amphiprion biaculeatus), also called the spinecheek anemonefish, is the largest and most assertive of the clownfishes. Its rich maroon-red body is crossed by three narrow bars — white in some populations, brilliant gold in others, the latter being especially prized. Hardy and full of personality, it is a popular and rewarding clownfish, but its size and temper set it apart: females in particular become large and territorial.

It earns its "spinecheek" name from the small spines on the gill cover, a feature that helps distinguish it from the other clownfish.

Natural Habitat & Origin

Amphiprion biaculeatus is found across the Indo-Pacific, where it lives in close association with host anemones — particularly the bubble-tip anemone (Entacmaea quadricolor) — on coral reefs. A single dominant female pairs with a smaller male, the two defending their anemone fiercely against intruders.

In the aquarium it does not require an anemone to thrive, but it appreciates rockwork and, if available, a suitable host anemone to bond with.

Care Requirements

Maintain stable marine conditions: salinity around 1.024–1.026, pH 8.1–8.4, and a temperature of about 24–26°C (75–79°F). Females can reach about 17 cm (7 inches) — far larger than the male — so provide a tank of around 115 litres (30 US gallons) or more. It is a hardy, adaptable fish that readily accepts aquarium foods. Keep only a bonded pair or a single specimen, as unrelated adults will fight.

Diet & Feeding

The Maroon Clownfish is an omnivore, feeding on zooplankton and algae in the wild. It eagerly accepts aquarium foods: offer a varied diet of frozen mysis and brine shrimp, quality marine pellets and flakes, and foods with marine algae content. Feed small amounts a couple of times a day; it is an easy, enthusiastic feeder.

Behavior & Temperament

This is the most aggressive clownfish, especially the dominant female, which will defend her territory against much larger fish and even nip the hand that feeds her. Keep only a single fish or an established male–female pair; introducing two unpaired adults usually ends badly. Its boldness makes it entertaining but means tankmates should be chosen with its temper in mind.

Tank Mates

House it with robust tankmates that can tolerate its territoriality — tangs, larger wrasses, dottybacks and similar — rather than very timid fish, which it may bully near its territory. It is fully reef-safe, leaving corals and ornamental invertebrates alone (aside from a host anemone it may bond with). Avoid keeping it with other clownfish species, which it will not tolerate.

Breeding

Amphiprion biaculeatus is among the most commonly bred marine fish, and captive-bred specimens — hardy and well-adjusted — are widely available. Pairs are protandrous (the dominant fish becomes female) and spawn readily, laying eggs on a cleaned surface near their anemone or rock, guarded by the male until hatching. It is an excellent species for marine breeding.

Common Health Issues

The Maroon Clownfish is hardy but, like all clownfish, can be susceptible to marine ich (Cryptocaryon irritans), marine velvet (Amyloodinium ocellatum) and the clownfish-prone disease brooklynellosis, particularly when stressed or newly imported. Quarantine new arrivals and keep water quality stable. Choose a captive-bred specimen where possible, keep only a pair or single fish, and this bold, beautiful clownfish will be a hardy and characterful centrepiece for a reef.