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

🌊 Marine 🌡️ Tropical

Flap-gilled dragonet

Eleutherochir opercularis Valenciennes, 1837
Max Length
11 cm
Max Weight
-
Lifespan
-
Trophic Level
3.3
Depth
-
Climate
Tropical
Resilience
High
Vulnerability
22.00/100
Typical Length
-
Depth Zone
demersal

📖 Overview

Inhabits shallow sandy and muddy bottoms in the sea, but also enters mouths of rivers and may live even in freshwater .

Scientific Name
Eleutherochir opercularis
Authority
Valenciennes, 1837
Habitat
Marine
Climate
Tropical
Body Shape
Elongated
Max Length
11 cm
Trophic Level
3.3
Resilience
High
Vulnerability
22.00/100
Salinity
30–40 ppt

🔬 Taxonomy

🐟 Physical Description

Dorsal spines (total): 4; Dorsal soft rays (total): 9; Anal soft rays: 9. Head and body brown or yellow, belly lighter. Back with small light spots and dark blotches. First dorsal fin black. Anal fin whitish. Pelvic fins dark and brown or black. Second dorsal, caudal, and pectoral fins spotted with dark brown. Body without lateral fold of skin below lateral line. Interorbital distance more than eye diameter (Ref 42832).: elongated.

🌀 Behaviour

Behavioural data for Flap-gilled dragonet 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; brackish; demersal. Tropical West Pacific: Sri Lanka, east coast of India, Andaman and Nicobar islands to western Malaysia (Penang) and Indonesia, east to the Philippines and the Ryukyu Islands, Japan.

🌿 Ecology

Zone Preferences
🌊 Marine 🌿 Brackish ⬇️ Benthic
Trophic Level
3.3±0.5

📐 Morphometrics

Length–Weight Relationship: W = 0.00794 × L2.82 (TL)
Max TL
11cm
Dorsal Spines
4
Dorsal Rays
9
Anal Rays
9

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
22.00/100
Low vulnerability
Trophic Level
3.3
Predator
Body Shape
Elongated
Climate Zone
Tropical
Described By
Valenciennes, 1837

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) - 7 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 Flap-gilled dragonet ↗
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.