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

🌊 Marine Least Concern 🌡️ Temperate

Littoral cusk

Monothrix polylepis Ogilby, 1897
Max Length
5 cm
Max Weight
-
Lifespan
-
Trophic Level
3.2
Depth
-
Climate
Temperate
Resilience
-
Vulnerability
10.00/100
Typical Length
-
Depth Zone
reef

📖 Overview

Littoral cusk (Monothrix polylepis), first described by Ogilby, 1897 is a small fish. Adults typically reach 5.00 cm in maximum length. It inhabits marine coastal and open-ocean environments. It occurs in Temperate waters. It is broadly omnivorous, taking invertebrates, plant matter, and detritus. On the IUCN Red List, it is classified as Least Concern.

Scientific Name
Monothrix polylepis
Authority
Ogilby, 1897
Habitat
Marine
Climate
Temperate
IUCN Status
LC
Max Length
5 cm
Trophic Level
3.2
Vulnerability
10.00/100
Salinity
30–40 ppt

🔬 Taxonomy

Genus
Monothrix
Monothrix
Species
Littoral cusk
Monothrix polylepis

🐟 Physical Description

Dorsal soft rays (total): 93 - 104; Anal soft rays: 64 - 76; Vertebrae: 45 - 47. This species possess the following set of characters: anterior nostril low on snout; copulatory organ of male with a simple and small flap-like pair of (outer) pseudoclaspers; small, size < 5.5 cm SL, short predorsal length 26.5-30.7 % SL; 13-14 precaudal vertebrae, 45-47 total vertebrae; D 93-104, A 64-76, branchiostegal rays 6-7, V in D 2.4-2.6; scale patch only on cheek, scaleless operculum; presence of upper preopercular pore; joined opening for the first and second lower preopercular pore; otolith elongate, its length to height 2.3-2.4, its sulcus with nearly straight dorsal and convex ventral rim, short with otolith length to sulcus length 2.0, colliculi is fused; maxilla expanded posteroventrally; short anterior anal fin pterygiophore .

🌀 Behaviour

Behavioural data for Littoral cusk 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. Temperate Southwest Pacific: eastern Australia.

🌿 Ecology

Zone Preferences
🌊 Marine 🪸 Reef Associated
Trophic Level
3.2±0.5

📐 Morphometrics

Length–Weight Relationship: W = 0.00389 × L3.12 (TL)
Max TL
5cm
Dorsal Rays
99
Anal Rays
70
Vertebrae
46

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2019

📊 Population Risk & Fisheries

Fishing Vulnerability
10.00/100
Low vulnerability
Trophic Level
3.2
Predator
Climate Zone
Temperate
Described By
Ogilby, 1897

👥 Community & Contribute

Aquareap Community Observations
0 Observations logged on Aquareap

No observations yet - be the first to log one!

View all observations for Littoral cusk ↗
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.