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

🌊 Marine 🌡️ Tropical

Ai's cusk

Monomitopus ainonaka Girard, Carter & Johnson, 2023
Max Length
13.5 cm
Max Weight
-
Lifespan
-
Trophic Level
3.4
Depth
768–796 m
Climate
Tropical
Resilience
High
Vulnerability
16.00/100
Typical Length
-
Depth Zone
-

📖 Overview

Ai's cusk (Monomitopus ainonaka), first described by Girard, Carter & Johnson, 2023 is a small fish in the family Ophidiidae (order Ophidiiformes). Adults typically reach 13.50 cm in maximum length. It inhabits marine coastal and open-ocean environments. Recorded depth range: 768 to 796 metres. It occurs in Tropical waters. It feeds on a mix of small fish and invertebrates as a mid-level predator.

Scientific Name
Monomitopus ainonaka
Authority
Girard, Carter & Johnson, 2023
Habitat
Marine
Climate
Tropical
Max Length
13.5 cm
Depth Range
768–796 m
Trophic Level
3.4
Resilience
High
Vulnerability
16.00/100
Salinity
30–40 ppt

🐟 Physical Description

Dorsal soft rays (total): 105; Anal soft rays: 92; Vertebrae: 62. This species is distinguished by the following characters: weak, flap-like spines on preopercle; downward-sloped dorsal profile between eye and origin of the dorsal fin in adulta; differs from other species in the M. nigripinnis species group occurring in the Pacific by the numbers of dorsal-fin rays 105 (vs. 94-103 in M. garmani, 96-99 in M. malispinosus), anal-fin rays 92 (vs. 76-87 in M. garmani; 81-84 in M. malispinosus), pectoral-fin rays 35 (vs. 28-32 in M. garmani; 26-29 in M. malispinosus) and smaller ratio of eye diameter relative to head length 4-4 (vs. 4.6-5.6 in M. garmani; 4.6-4.9 in M. malispinosus) .Cross section: oval.

🌀 Behaviour

Behavioural data for Ai's 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; bathydemersal; depth range 768 - 796 m . Tropical East Central Pacific: Hawaii.

🌿 Ecology

Zone Preferences
🌊 Marine
Trophic Level
3.4±0.6

📐 Morphometrics

Length–Weight Relationship: W = 0.0038 × L3.14 (TL)
Max TL
13.5cm
Dorsal Rays
105
Anal Rays
92
Vertebrae
62

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
16.00/100
Low vulnerability
Trophic Level
3.4
Predator
Climate Zone
Tropical
Described By
Girard, Carter & Johnson, 2023

👥 Community & Contribute

Aquareap Community Observations
0 Observations logged on Aquareap

No observations yet - be the first to log one!

View all observations for Ai's 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.