Acanthurus japonicus 10-12 cm

Acanthurus japonicus: A Japanese Surgeonfish with Refined Colors

The Acanthurus japonicus, also known as the Japanese surgeonfish, is a highly sought-after species in marine aquariums for its elegant silhouette and vivid and contrasting coloration. It features a dark body with brown hues, highlighted by a white lateral spot, an orange-yellow band on its back, and a tail encircled in white, giving it a unique presence.

Native to the Western Pacific, particularly the reefs of Japan, Indonesia, and the Philippines, the Acanthurus japonicus is an active fish, sensitive to water quality and best kept in a large aquarium of more than 600 liters to provide optimal living conditions.

Vivid and Sometimes Territorial Behavior

This Japanese surgeonfish is known for its liveliness and moderately territorial temperament. It is important to provide it with a well-structured environment with open swimming areas and hiding spots. It can coexist with other peaceful marine species, but cohabitation with other surgeonfish should be planned carefully.

It is recommended to introduce this fish last into the tank, especially if other Acanthurus species are already present, to minimize aggressive behaviors and territorial disputes.

A Richly Plant-Based Diet

The Acanthurus japonicus is primarily herbivorous and requires a varied and plant-rich diet to maintain its energy and resilience. Its daily diet should include:

• Fresh or dried nori seaweed.
• Specific herbivore fish pellets based on spirulina.
• Vegetable flakes occasionally supplemented by small protein sources like brine shrimp or krill.

An appropriate diet not only supports its digestive health but also enhances the intensity of its colors and stabilizes its behavior.

A Sensitive but Rewarding Fish

The Acanthurus japonicus is known to be more delicate to acclimate than other surgeonfish. It is particularly sensitive to variations in water quality, nitrates, and stress. An effective filtration system, good oxygenation, and a rigorous maintenance routine are essential for its success in captivity.

Once well-acclimated, the Japanese surgeonfish proves to be an elegant, active, and highly appreciated fish for the refined touch it brings to a reef aquarium.

For experienced aquarists seeking a fish with sophisticated colors, useful against algae, and expressive in the tank, the Acanthurus japonicus is a choice species, provided it is given a stable and suitable environment.