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

🌊 Marine Data Deficient 🌡️ Tropical

East coast flounder

Arnoglossus dalgleishi von Bonde, 1922
Max Length
20 cm
Max Weight
-
Lifespan
-
Trophic Level
3.5
Depth
50–220 m
Climate
Tropical
Resilience
Medium
Vulnerability
35.00/100
Typical Length
-
Depth Zone
demersal

📖 Overview

East coast flounder (Arnoglossus dalgleishi), first described by von Bonde, 1922 is a medium-sized fish in the family Bothidae (order Pleuronectiformes). Adults typically reach 20.00 cm in maximum length. It inhabits marine coastal and open-ocean environments. Recorded depth range: 50 to 220 metres. It occurs in Tropical waters. It feeds on a mix of small fish and invertebrates as a mid-level predator. On the IUCN Red List, it is classified as Data Deficient.

Scientific Name
Arnoglossus dalgleishi
Authority
von Bonde, 1922
Habitat
Marine
Climate
Tropical
Body Shape
Short and / or deep
IUCN Status
DD
Max Length
20 cm
Depth Range
50–220 m
Trophic Level
3.5
Resilience
Medium
Vulnerability
35.00/100
Salinity
30–40 ppt

🔬 Taxonomy

🐟 Physical Description

Dorsal spines (total): 0; Dorsal soft rays (total): 101 - 108; Anal spines: 0; Anal soft rays: 78 - 83. Dark blotches on dorsal and anal fins; last 3 pelvic rays on eyed side and 1st 3 dorsal rays darkened .: short and / or deep.

🌀 Behaviour

Behavioural data for East coast flounder 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; demersal; depth range 50 - 220 m . Tropical South Africa), Zanzibar (Tanzania), Mombasa (Kenya) and northeastern Indian Ocean, as well as Mozambique.

🌿 Ecology

Zone Preferences
🌊 Marine ⬇️ Benthic
Trophic Level
3.5±0.37
Food Items

bottom-living animals (Ref

📐 Morphometrics

Length–Weight Relationship: W = 0.00288 × L2.95 (TL)
Max TL
20cm
Dorsal Rays
105
Anal Rays
81

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Data Deficient
Assessment Date
2021

📊 Population Risk & Fisheries

Population Resilience
Medium
Minimum doubling time
Fishing Vulnerability
35.00/100
Low vulnerability
Trophic Level
3.5
Predator
Body Shape
Short and / or deep
Climate Zone
Tropical
Described By
von Bonde, 1922

🌐 Names & Taxonomy

Language Common Names
🇬🇧English East Coast flounder · Natal Lefteye Flounder
🇷🇺Russian Восточноафриканская арноглосса

Scientific Synonyms

Scientific Name Author Year Status
Trichopsetta dalgleishi von Bonde 1922 Synonym

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) - 2 records indexed .

Occurrence density from GBIF View GBIF records ↗

👥 Community & Contribute

Aquareap Community Observations
0 Observations logged on Aquareap

No observations yet - be the first to log one!

View all observations for East coast flounder ↗
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.