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

💧 Freshwater Least Concern 🌡️ Tropical

Slender stonebasher

Heteromormyrus ansorgii Boulenger, 1905
Max Length
15 cm
Max Weight
Lifespan
Trophic Level
3.2
Depth
Climate
Tropical
Resilience
High
Vulnerability
17.00/100
Typical Length
Depth Zone
demersal

📖 Overview

Found in rocky habitats in flowing waters . Feeds on small aquatic invertebrates such as insect larvae .

Scientific Name
Heteromormyrus ansorgii
Authority
Boulenger, 1905
Habitat
Freshwater
Climate
Tropical
IUCN Status
LC
Max Length
15 cm
Trophic Level
3.2
Resilience
High
Vulnerability
17.00/100
Salinity
0–0.5 ppt

🔬 Taxonomy

Genus
Heteromormyrus
Heteromormyrus
Species
Slender stonebasher
Heteromormyrus ansorgii

🐟 Physical Description

Dorsal spines (total): 0; Dorsal soft rays (total): 18 - 19; Anal spines: 0; Anal soft rays: 24 - 26. Diagnosis: dorsal fin origin nearer caudal fin base than tip of snout; origin of dorsal fin behind origin of anal fin; dorsal fin shorter than anal fin; chin (mental swelling) present but feebly developed; dorsal fin with 19 rays, anal fin with 24-26 rays .

🌀 Behaviour

Behavioural data for Slender stonebasher is currently being reviewed.

🦐 Diet

Diet information for Slender stonebasher is currently being compiled.

🥚 Reproduction

Reproduction data for Slender stonebasher is currently being compiled.

🌍 Habitat & Distribution

Freshwater; demersal. Tropical; 11°S - 21°S occurs in the Ruo River (lower Zambezi system) in Malawi (Ref.

🌿 Ecology

Zone Preferences
💧 Freshwater ⬇️ Benthic
Trophic Level
3.2±0.4
Food Items

small aquatic invertebrates (Ref

📐 Morphometrics

Length–Weight Relationship: W = 0.00562 × L3.05 (TL)
Max TL
15cm
Dorsal Rays
19
Anal Rays
25

🌡️ Water Parameters & Tolerance

Salinity Range
0–0.5ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2018

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
17.00/100
Low vulnerability
Trophic Level
3.2
Predator
Climate Zone
Tropical
Described By
Boulenger, 1905

👥 Community & Contribute

Aquareap Community Observations
0 Observations logged on Aquareap

No observations yet — be the first to log one!

View all observations for Slender stonebasher ↗
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Spotted incorrect or outdated data?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.