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

🌊 Marine Least Concern 🌡️ Tropical

Blacktail threefin

Enneapterygius bahasa Fricke, 1997
Max Length
4 cm
Max Weight
-
Lifespan
-
Trophic Level
3.1
Depth
0–18 m
Climate
Tropical
Resilience
High
Vulnerability
10.00/100
Typical Length
-
Depth Zone
reef

📖 Overview

Adults occur in shallow waters, mainly on the reef flat or crest. They are found on shady vertical rock walls with some current and relatively high oxygen level . Eggs are hemispherical and covered with numerous sticky threads that anchor them in the algae on the nesting sites . Larvae are planktonic which occur primarily in shallow, nearshore waters .

Scientific Name
Enneapterygius bahasa
Authority
Fricke, 1997
Habitat
Marine
Climate
Tropical
Body Shape
Elongated
IUCN Status
LC
Max Length
4 cm
Depth Range
0–18 m
Trophic Level
3.1
Resilience
High
Vulnerability
10.00/100
Salinity
30–40 ppt

🔬 Taxonomy

🐟 Physical Description

Dorsal spines (total): 14 - 18; Dorsal soft rays (total): 6 - 11; Anal spines: 1; Anal soft rays: 16 - 20. Male with reddish head and body, row of white blotches along side, additional row of white saddles on back, blackish tail, and black "mask" on front and lower half of head. Female translucent yellowish or orange with faint dark saddles/streaks on back. Dorsal rays III + XI-XV + 6-11; anal rays I,16-20; pectoral rays 16-18; pelvic rays I,2; lateral line interrupted, 13-20 + 13-22; head, chest, and pectoral-fin base scaleless; simple orbital tentacle present; mandibular pores 3-6 + 2-8 + 3-6. Maximum size to 4 cm TL .: elongated.

🌀 Behaviour

Behavioural data for Blacktail threefin is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Oviparous 📦 Batch Spawner
Spawning Season
spring-summer
Spawn Location
Pelagic
Fertilization
External

🌍 Habitat & Distribution

Marine; reef-associated; depth range 0 - 18 m . Tropical

🌿 Ecology

Zone Preferences
🌊 Marine 🪸 Reef Associated
Trophic Level
3.1±0.3

📐 Morphometrics

Length–Weight Relationship: W = 0.00617 × L3.03 (TL)
Max TL
4cm
Dorsal Spines
16
Dorsal Rays
9
Anal Spines
1
Anal Rays
18

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2010

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
10.00/100
Low vulnerability
Trophic Level
3.1
Predator
Body Shape
Elongated
Climate Zone
Tropical
Described By
Fricke, 1997

🌐 Names & Taxonomy

Language Common Names
🇬🇧English Blacktail Threefin · Blacktail Triplefin
🇯🇵Japanese Gomafuhebigimpo · ゴマフヘビギンポ

🗺️ 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 Blacktail threefin ↗
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.