New 🐟 Mercury Safety Guide & Omega-3 Rankings Updated for 2026. View Omega-3 Rankings →

🌊 Marine Least Concern 🌡️ Tropical

West Australian butterflyfish

Chaetodon assarius Waite, 1905
Max Length
13 cm
Max Weight
-
Lifespan
-
Trophic Level
2.7
Depth
1–40 m
Climate
Tropical
Resilience
High
Vulnerability
14.00/100
Typical Length
-
Depth Zone
reef

📖 Overview

Inhabits rocky reefs and sandy-weed flats . Occurs in aggregations . Feeds on algae and zooplankton. Oviparous . Form pairs during breeding . Recently discovered in deep water in cold upwelling areas of Bali . Unknown to American and European aquarists although can easily be maintained in a tank according to Australian aquarists.

Scientific Name
Chaetodon assarius
Authority
Waite, 1905
Habitat
Marine
Climate
Tropical
Body Shape
Short and / or deep
IUCN Status
LC
Max Length
13 cm
Depth Range
1–40 m
Trophic Level
2.7
Resilience
High
Vulnerability
14.00/100
Migration
Non-migratory
Salinity
30–40 ppt

🔬 Taxonomy

🐟 Physical Description

Dorsal spines (total): 12 - 13; Dorsal soft rays (total): 21 - 22; Anal spines: 3; Anal soft rays: 18 - 19. : short and / or deep; Cross section: compressed.

🌀 Behaviour

Behavioural data for West Australian butterflyfish is currently being reviewed.

🦐 Diet

Diet information for West Australian butterflyfish is currently being compiled.

🥚 Reproduction

Form pairs during breeding .

🌍 Habitat & Distribution

Marine; reef-associated; non-migratory; depth range 1 - 40 m . Tropical; 20°S - 35°S found in southern Indonesia (Ref.

🌿 Ecology

Zone Preferences
🌊 Marine 🪸 Reef Associated
Migration
Non-migratory
Trophic Level
2.7±0.29
Food Items

algae and zooplankton

📐 Morphometrics

Length–Weight Relationship: W = 0.02291 × L3 (TL)
Max TL
13cm
Dorsal Spines
13
Dorsal Rays
22
Anal Spines
3
Anal Rays
19

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2009

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
14.00/100
Low vulnerability
Trophic Level
2.7
Omnivore / Planktivore
Body Shape
Short and / or deep
Climate Zone
Tropical
Described By
Waite, 1905

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) - 1 records indexed .

Occurrence density from GBIF View GBIF records ↗

👥 Community & Contribute

Aquareap Community Observations
0 Observations logged on Aquareap

No observations yet - be the first to log one!

View all observations for West Australian butterflyfish ↗
Suggest an Edit

Spotted incorrect or outdated data? Submit a correction and our editorial team will review it. Approved edits go live within 48 hours.

Link to a scientific paper, FishBase, or other authoritative source
Report an Issue

Found a factual error, broken data, or inappropriate content? Let us know and we will investigate promptly.