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

🌊 Marine Least Concern 🌡️ Tropical

William's triplefin

Enneapterygius williamsi Fricke, 1997
Max Length
3.3 cm
Max Weight
-
Lifespan
-
Trophic Level
3.1
Depth
0–10 m
Climate
Tropical
Resilience
High
Vulnerability
10.00/100
Typical Length
-
Depth Zone
reef

📖 Overview

Overview information for William's triplefin is currently being compiled by our editorial team.

Scientific Name
Enneapterygius williamsi
Authority
Fricke, 1997
Habitat
Marine
Climate
Tropical
Body Shape
Elongated
IUCN Status
LC
Max Length
3.3 cm
Depth Range
0–10 m
Trophic Level
3.1
Resilience
High
Vulnerability
10.00/100
Salinity
30–40 ppt

🔬 Taxonomy

🐟 Physical Description

Dorsal spines (total): 14 - 17; Dorsal soft rays (total): 7 - 10; Anal spines: 1; Anal soft rays: 16 - 20. Very small supraorbital tentacle; in females, first dorsal fin shorter by half than second dorsal fin; in males, about two-thirds; male coloration dark gray with light gray mottling and a thin whitish bar below the eye; oblique suborbital blue streak observed in large males; fins translucent, mottled, and with gray spots; females comparatively pale and anteriorly bearing 2 indistinct, dark double bars that join below lateral line. Dorsal rays III + XI-XIV + 7-10; lateral line interrupted, 14-20 + 15-21; mandibular pores 2-3 + 1-2 + 2-3 .: elongated.

🌀 Behaviour

Behavioural data for William's triplefin is currently being reviewed.

🦐 Diet

Diet information for William's triplefin is currently being compiled.

🥚 Reproduction

Reproduction data for William's triplefin is currently being compiled.

🌍 Habitat & Distribution

Marine; reef-associated; depth range 0 - 10 m . Tropical Central Pacific: Vanuatu, New Caledonia, and Tonga.

🌿 Ecology

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

📐 Morphometrics

Length–Weight Relationship: W = 0.00617 × L3.03 (TL)
Max TL
3.3cm
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 William's Triplefin

🗺️ 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 William's triplefin ↗
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.