Saltwater Fish
Amphiprion polymnus
Amphiprion polymnus
(Saddleback Clownfish)

Species Description…

Scientific Name: Amphiprion polymnus
Common Name: Saddleback Clownfish
Species Group: Clownfish
Habitat: Reef Safe
Care Level: Beginner
Temperament: Semi-aggressive
Diet Type: Omnivore
Role in Aquarium: Host to Anemones
Max Fish Length: 5 (inches)
Min Aquarium Size: 30 (gallons)
Native Range: Indo-Pacific, including the Philippines, Indonesia, and the Great Barrier Reef
Amphiprion Polymnus - The Saddleback Clownfish

Amphiprion Polymnus (The Saddleback Clownfish)

Overview

  • Found in the Indo-Pacific, particularly in shallow coastal reef environments.
  • Easily identified by its dark body with a white saddle-like marking across its back.
  • A moderately aggressive species that forms symbiotic relationships with sea anemones.
  • Popular among aquarists for its unique pattern and strong territorial behaviors.

Feeding

  • Omnivorous, consuming plankton, small crustaceans, and marine algae.
  • Readily eats high-quality flakes, pellets, and frozen foods like brine shrimp and mysis shrimp.
  • A well-balanced diet with vitamin-enriched foods helps maintain vibrant coloration.
  • Feeding smaller meals multiple times daily promotes healthy digestion.

Habitat

  • Inhabits warm, shallow reefs with abundant coral structures and sandy bottoms.
  • Prefers stable water conditions with moderate water movement.
  • Does well in aquariums with live rock and host anemones such as Stichodactyla haddoni.
  • Thrives in naturalistic setups that allow for territorial behaviors.

Fish Care

  • Recommended temperature range: 74-82°F (23-28°C).
  • Ideal pH: 8.1-8.4, with a salinity level between 1.020-1.025.
  • A hardy species but requires good water quality to prevent stress-related illnesses.
  • Regular water changes and efficient filtration help ensure long-term health.
  • Providing a secure hiding place and anemone (if available) reduces aggression.

Compatibility

  • Can be territorial, especially when hosting an anemone.
  • Compatible with other semi-aggressive fish such as damselfish, wrasses, and tangs.
  • Not recommended to be housed with timid or slow-moving species.
  • Best kept as a pair or in a group introduced at the same time.

Aquarium Behavior

  • Active and assertive, often defending its territory near its anemone or rock structure.
  • Forms strong social bonds, especially in paired setups.
  • May exhibit hosting behaviors with large soft corals if an anemone is unavailable.
  • Providing open swimming space and shelter encourages natural activity and interaction.