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Japan surgeonfish (Acanthurus japonicus) — Acanthuridae

Japan surgeonfish

Acanthurus japonicus
Family: Acanthuridae

The Japan surgeonfish (Acanthurus japonicus) is a saltwater fish of the family Acanthuridae that grows up to 23 cm.

Length
23 cm
Water
Saltwater
Depth
1.0–20.0 m
Diet
Herbivore
Activity
Diurnal
Body shape
Flat / disc-shaped
Substrate
Stone or rock
Danger
Can cause injury
Range
Asia: Brunei Darsm, China, Taiwan/Ch Taipei, Hong Kong, Indonesia, Japan and others
Edibility
Commonly eaten

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Description

The Japan surgeonfish is a surgeonfish (Acanthuridae) from the western Pacific, around Japan, Taiwan and the Philippines. The species grows to about 23 cm and has a dark-brown, disc-shaped body with a conspicuous white band below the eye and an orange band along the dorsal fin. As a reef-dweller it grazes algae from coral and rocky reefs. A sharp, scalpel-like spine sits on each side of the tail base that can inflict a deep cut; handle with care. It is popular in the aquarium trade.

Frequently asked questions

How do you recognise the Japan surgeonfish?

The Japan surgeonfish has a flattened, disc-shaped body and is mainly brown. Bears sharp spines, plates or strong jaws that can cause cuts or puncture wounds; handle with care.

Where does the Japan surgeonfish live?

The Japan surgeonfish lives in the sea (marine waters) and is mostly found around stony or rocky ground. Asia: Brunei Darsm, China, Taiwan/Ch Taipei, Hong Kong, Indonesia, Japan and others

How big does the Japan surgeonfish get?

The Japan surgeonfish grows to a maximum of about 23 cm.

Is the Japan surgeonfish dangerous to humans?

The Japan surgeonfish can cause injury; handle it with care. Never grab a live surgeonfish by the tail; a sharp, scalpel-like spine sits on each side of the tail base. For a cut: rinse with clean water, apply pressure to stop bleeding and cover with a sterile dressing. Deep wounds easily become infected: have them assessed medically and check tetanus status.

Is the Japan surgeonfish edible?

Yes, the Japan surgeonfish is commonly eaten.

More photos

Japan surgeonfish (Acanthurus japonicus) — Acanthuridae — 2
iNaturalist ((c) kyosapir, some rights reserved (CC BY-NC))
Japan surgeonfish (Acanthurus japonicus) — Acanthuridae — 3
Wikimedia Commons — Divervincent (CC BY-SA 3.0)
Japan surgeonfish (Acanthurus japonicus) — Acanthuridae — 4
iNaturalist ((c) desertnaturalist, some rights reserved (CC BY))
Japan surgeonfish (Acanthurus japonicus) — Acanthuridae — 5
Timothy E Myer (CC BY-NC 4.0) via GBIF — iNaturalist
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All data

Identification

English name
Japan surgeonfish sourced
Scientific name
Acanthurus japonicus
Family
Acanthuridae
Other names
Japan surgeonfish; Powder black surgeon; White-nose surgeonfish verified

Appearance

Size class
Medium verified
Max length (cm)
23.0 verified
Body shape
Flat / disc-shaped sourced
Dominant colour
Brown sourced
Tail shape
Crescent (lunate) inferred

Habitat & distribution

Water type
Saltwater sourced
Substrate
Stone or rock sourced
Min depth (m)
1.0 verified
Max depth (m)
20.0 verified
Natural range
Asia: Brunei Darsm, China, Taiwan/Ch Taipei, Hong Kong, Indonesia, Japan and others sourced
Origin
Native inferred

Behaviour & biology

Diet
Herbivore sourced
Diet (detail)
Algae, seaweeds and plant material inferred
Territorial
No inferred
Activity
Diurnal inferred
Reproduction
Separate sexes inferred
Sexual dimorphism
No inferred
Seasonality
Present year-round in its habitat; no pronounced seasonality known. inferred
Special features
Bears sharp spines, plates or strong jaws that can cause cuts or puncture wounds; handle with care. inferred

For anglers

Edibility
Commonly eaten inferred
Fishing method
Fishing with natural bait (fish, shrimp, worm) or lures close to reef and rock structures. inferred
Regulations source
FishBase ↗ inferred

Safety

Danger to humans
Can cause injury verified
First aid
Never grab a live surgeonfish by the tail; a sharp, scalpel-like spine sits on each side of the tail base. For a cut: rinse with clean water, apply pressure to stop bleeding and cover with a sterile dressing. Deep wounds easily become infected: have them assessed medically and check tetanus status. sourced

Status & sources

Sources
FishBase via GBIF (DwC-A), CC-BY-NC 4.0

Same genus Acanthurus

More from the family Acanthuridae

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