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Ocean animals

Black-axil chromis

Amazing fact

The black-axil chromis has a forked tail fin.

国立科学博物館
Black-axil chromis in its habitat (illustration)

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An illustration based on the real animal.

A little discovery to share.

The black-axil chromis has a forked tail fin.

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THE REAL WORLD

The real Black-axil chromis

Scientific name
Chromis atripectoralis
Japanese name
アオバスズメダイ
Group
Ocean animals
Order
Blenniiformes
Family
Pomacentridae
Genus
Chromis
Facts about the real animal.

Where the name “Black-axil chromis” comes from

Its species name comes from Latin words meaning black and of the breast.

Museums Victoria
01

A fish that lives from the Ryukyu Islands across the Indian and Pacific Oceans.

02

It is the same blue-green color as the green chromis, but it has a black spot at the base of each pectoral fin.

How the Black-axil chromis lives

It lives in clear lagoons and reef passages. It eats zooplankton and fish eggs. It gathers in large feeding groups above branching corals.

Museums Victoria国立科学博物館

Basic data

Range
Ryukyu Islands and Indo-Pacific
鳥羽水族館

Where the Black-axil chromis has been recorded

World map with dots where the Black-axil chromis has been recorded
Each dot marks a place with observations or specimens shared on GBIF. Some records are of animals that strayed or were brought by people, so the dots are not always where the animal lives.

Records: GBIF.org (CC0 and CC BY 4.0 records, retrieved 2026-11-07). Map: Natural EarthSee the records on GBIF

Watch wild animals from a distance. Do not touch or feed them, and take care of the places where they live.

Names around the world

简体中文
月腋光鳃鱼
繁體中文
黑腋光鰓魚
Português (Brasil)
Donzela-de-axila-preta
Bahasa Indonesia
Betok toska

Names come from Wikidata and iNaturalist records. Where a language has no recorded name, we use the scientific name.

Sources and how we check

We check each fact against its source. The illustrations simplify how the real animal looks.

The classification (class, order, family, genus) follows Wikidata records, checked against GBIF. Classifications can change as research goes on.

The basic data are the values given in each source. They vary with how the animal is measured, whether it is male or female, and whether it lives in the wild or in captivity.

This page was translated from the original Japanese with the help of AI.

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