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

🌊 Marine 🌡️ Tropical

Monster cardinal-fish

Jaydia melanopus Weber, 1911
Max Length
11 cm
Max Weight
-
Lifespan
-
Trophic Level
3.5
Depth
2–160 m
Climate
Tropical
Resilience
High
Vulnerability
15.00/100
Typical Length
-
Depth Zone
-

📖 Overview

Monster cardinal-fish (Jaydia melanopus), first described by Weber, 1911 is a small fish in the family Apogonidae (order Apogoniformes). Adults typically reach 11.00 cm in maximum length. It inhabits marine coastal and open-ocean environments. Recorded depth range: 2 to 160 metres. It occurs in Tropical waters. It feeds on a mix of small fish and invertebrates as a mid-level predator. The species active primarily at night.

Scientific Name
Jaydia melanopus
Authority
Weber, 1911
Habitat
Marine
Climate
Tropical
Body Shape
Short and / or deep
Max Length
11 cm
Depth Range
2–160 m
Trophic Level
3.5
Resilience
High
Vulnerability
15.00/100
Salinity
30–40 ppt

🐟 Physical Description

Dorsal spines (total): 8; Dorsal soft rays (total): 9; Anal spines: 2; Anal soft rays: 9. : short and / or deep; Cross section: compressed.

🌀 Behaviour

Behavioural data for Monster cardinal-fish is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

👄 Mouth Brooder

Mouthbrooders . Distinct pairing during courtship and spawning .

🌍 Habitat & Distribution

Marine; benthopelagic; depth range 2 - 160 m , usually 2 - 50 m . Tropical

🌿 Ecology

Zone Preferences
🌊 Marine
Trophic Level
3.5±0.6
🌙 Nocturnal

📐 Morphometrics

Length–Weight Relationship: W = 0.01479 × L3.06 (TL)
Max TL
11cm
Dorsal Spines
8
Dorsal Rays
9
Anal Spines
2
Anal Rays
9

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
15.00/100
Low vulnerability
Trophic Level
3.5
Predator
Body Shape
Short and / or deep
Climate Zone
Tropical
Described By
Weber, 1911

👥 Community & Contribute

Aquareap Community Observations
0 Observations logged on Aquareap

No observations yet - be the first to log one!

View all observations for Monster cardinal-fish ↗
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Spotted incorrect or outdated data?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.