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

💧 Freshwater Least Concern 🍽️ Edible ⚡ Other 🌡️ Temperate

Naked osman

Gymnodiptychus dybowskii Kessler, 1874
Max Length
45 cm
Max Weight
3.0 kg
Lifespan
-
Trophic Level
3.7
Depth
-
Climate
Temperate
Resilience
Medium
Vulnerability
47.00/100
Typical Length
23 cm
Depth Zone
-

📖 Overview

Inhabits rivers and lakes. Feeds on small fish, amphipods, mollusks and insect larvae. Eggs and milt are poisonous.

Scientific Name
Gymnodiptychus dybowskii
Authority
Kessler, 1874
Habitat
Freshwater
Climate
Temperate
IUCN Status
LC
Max Length
45 cm
Max Weight
3 kg
Trophic Level
3.7
Resilience
Medium
Vulnerability
47.00/100
Salinity
0–0.5 ppt

🔬 Taxonomy

Genus
Gymnodiptychus
Gymnodiptychus
Species
Naked osman
Gymnodiptychus dybowskii

🐟 Physical Description

Physical description for Naked osman is currently being compiled.

🌀 Behaviour

Behavioural data for Naked osman is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Oviparous
Spawning Season
spring
Spawn Location
Substrate
Fertilization
External

🌍 Habitat & Distribution

Freshwater; benthopelagic. Temperate

🌿 Ecology

Zone Preferences
💧 Freshwater
Trophic Level
3.7±0.6
Food Items

small fish, amphipods, mollusks and insect larvae

📐 Morphometrics

Length–Weight Relationship: W = 0.01047 × L3.02 (TL)
Max TL
45cm
Max Weight
3,000g

🌡️ Water Parameters & Tolerance

Salinity Range
0–0.5ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2020

📊 Population Risk & Fisheries

Population Resilience
Medium
Minimum doubling time
Fishing Vulnerability
47.00/100
Moderate-High vulnerability
Trophic Level
3.7
Predator
Climate Zone
Temperate
Described By
Kessler, 1874

🍽️ Edibility & Flavour

"Gymnodiptychus Dybowskii is an edible species."

✗ Not for Raw
✓ Fresh Indicators
  • Clear, bright eyes — cloudy eyes indicate age
  • Firm flesh that springs back when pressed
  • Fresh ocean smell, never strong or ammonia-like
  • Bright red or pink gills, not grey or brown
  • Shiny, moist skin with scales tightly attached
✗ Avoid If
  • Cloudy or sunken eyes
  • Strong fishy or ammonia odour
  • Soft, mushy flesh that doesn't spring back
  • Discoloured or dry flesh
Best Cooking Methods
Baking Grilling Pan-frying

⚡ Nutrition

Detailed nutritional data for Naked osman is currently being compiled from USDA FoodData Central.

🔬 Mercury Safety

Mercury data for Naked osman has not yet been assigned. Please consult FDA/EPA guidance for general seafood safety advice.

🌿 Sustainability

Best Choice
Healthy stocks, low impact
Good Alternative
Well-managed, minor concerns
Use Caution
Check sourcing and season
Avoid
Overfished or high impact

📊 Population Dynamics

Year Region Index Notes
- - -

👥 Community & Contribute

Aquareap Community Observations
0 Observations logged on Aquareap

No observations yet - be the first to log one!

View all observations for Naked osman ↗
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.