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

🌊 Marine 🌡️ Tropical

Olivaceous grunter

Hapalogenys olivaceus Bogorodsky & Matiku, 2026
Max Length
20.5 cm
Max Weight
-
Lifespan
-
Trophic Level
3.8
Depth
215–217 m
Climate
Tropical
Resilience
High
Vulnerability
15.00/100
Typical Length
-
Depth Zone
-

📖 Overview

Olivaceous grunter (Hapalogenys olivaceus), first described by Bogorodsky & Matiku, 2026 is a medium-sized fish in the family Hapalogenyidae (order Perciformes). Adults typically reach 20.50 cm in maximum length. It inhabits marine coastal and open-ocean environments. Recorded depth range: 215 to 217 metres. It occurs in Tropical waters. It feeds on a mix of small fish and invertebrates as a mid-level predator.

Scientific Name
Hapalogenys olivaceus
Authority
Bogorodsky & Matiku, 2026
Habitat
Marine
Climate
Tropical
Body Shape
Short and / or deep
Max Length
20.5 cm
Depth Range
215–217 m
Trophic Level
3.8
Resilience
High
Vulnerability
15.00/100
Salinity
30–40 ppt

🐟 Physical Description

Dorsal spines (total): 11; Dorsal soft rays (total): 14; Anal spines: 3; Anal soft rays: 9; Vertebrae: 24. This species is distinguished from its congeners by the following set of characters: dorsal-fin rays XI,14; pored lateral-lines scales 44-45; a series of 9-10 pores along the ventral edge of the suborbital; maxilla scaly; suborbital deeply notched above the posterior end of the maxilla; second dorsal-fin ray short, 6.5-6.8 in SL; first pelvic-fin ray filamentous; body mainly uniform olive-brown with a pale area posterior to pectoral fins; and membranes of the posterior part (between spines IX-XI) of the spinous dorsal fin black .: short and / or deep; Cross section: compressed.

🌀 Behaviour

Behavioural data for Olivaceous grunter 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; benthopelagic; depth range 215 - 217 m . Tropical Indian Ocean: Tanzania.

🌿 Ecology

Zone Preferences
🌊 Marine
Trophic Level
3.8±0.6

📐 Morphometrics

Length–Weight Relationship: W = 0.01862 × L3.01 (TL)
Max TL
20.5cm
Dorsal Spines
11
Dorsal Rays
14
Anal Spines
3
Anal Rays
9
Vertebrae
24

🌡️ 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
3.8
Predator
Body Shape
Short and / or deep
Climate Zone
Tropical
Described By
Bogorodsky & Matiku, 2026

👥 Community & Contribute

Aquareap Community Observations
0 Observations logged on Aquareap

No observations yet - be the first to log one!

View all observations for Olivaceous grunter ↗
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.