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💧 Freshwater Least Concern 🎣 Game Fish ⚠️ Venomous ⚡ Traumatogenic 🌡️ Tropical 🎣 Game Fish

South American freshwater stingray

Potamotrygon motoro Müller & Henle, 1841
Potamotrygon Motoro (Potamotrygon motoro)
Potamotrygon Motoro (Potamotrygon motoro)
Max Length
-
Max Weight
34.2 kg
Lifespan
-
Trophic Level
3.2
Depth
-
Climate
Tropical
Resilience
Low
Vulnerability
53.00/100
Typical Length
-
Depth Zone
-

📖 Overview

Found in freshwater rivers. It is an extremely dangerous species. Maximum length reported in Axelrod et al., 1991 is 100 cm TL.

Scientific Name
Potamotrygon motoro
Authority
Müller & Henle, 1841
Habitat
Freshwater
Climate
Tropical
IUCN Status
LC
Max Weight
34.2 kg
Trophic Level
3.2
Resilience
Low
Vulnerability
53.00/100
Migration
Potamodromous
Water Temp
24–26 °C
Salinity
0–0.5 ppt

🔬 Taxonomy

🐟 Physical Description

Physical description for South American freshwater stingray is currently being compiled.

🌀 Behaviour

Behavioural data for South American freshwater stingray is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Oviparous
Spawning Season
spring
Spawn Location
Substrate
Fertilization
External

16 pups were born by one female in captivity .

🌍 Habitat & Distribution

Freshwater; benthopelagic; pH range: 5.0 - 6.0; dH range: 10 - ?; potamodromous . Tropical; 24°C - 26°C South America: Uruguay, Paraná-Paraguay, Orinoco, and Amazon River basins.

🌿 Ecology

Zone Preferences
💧 Freshwater
Migration
Potamodromous
Trophic Level
3.2±0.4

📐 Morphometrics

Length–Weight Relationship: W = 0.01 × L3.04 (TL)
Max Weight
34,200g

🌡️ Water Parameters & Tolerance

Temperature Range
24–26°C
pH Range
5–6
Salinity Range
0–0.5ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2024

📊 Population Risk & Fisheries

Population Resilience
Low
Minimum doubling time
Fishing Vulnerability
53.00/100
Moderate-High vulnerability
Trophic Level
3.2
Predator
Climate Zone
Tropical
Described By
Müller & Henle, 1841

⚠️ Venom Profile

Medical Warning: This species is venomous. Seek immediate medical attention if envenomated. Contact emergency services and follow first aid guidance below.
Venom Type
proteinaceous neurotoxin
Delivery
dorsal, anal, and pelvic fin spines
Potency
Severe
Mortality Risk
Low
Symptom Onset
5min
Duration
24.0hrs
Antivenom
✗ Not Available
Named Toxins
high-molecular-weight protein (Stonustoxin analogue) acetylcholine
Symptoms
  • immediate intense pain
  • swelling
  • erythema
  • occasional nausea and weakness
Affected Body Systems
peripheral nervous system cardiovascular
First Aid
Immerse affected area in hot water (45 C, tolerable) for 30-90 minutes to denature toxin. Do not apply ice.
Medical Treatment

Analgesia; wound care; tetanus prophylaxis; severe cases may require monitoring for systemic effects.

References: Compiled from Bhide (2018), Halstead et al. (1988) and family-specific envenomation literature

🎣 Angling Guide

Difficulty
Beginner
Fight Rating
strong pulls with head-shakes
Best Seasons
spring,summer,fall
Best Time
incoming tide, dawn and dusk
Line Weight
15-30
Rod Type
medium-heavy spinning
Hook Size
2/0-5/0
Catch & Release
✓ Recommended
Best Months
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Techniques
bottom fishing popping cork soft plastics live bait
Bait & Lures
live shrimp cut mullet soft plastic paddle-tails popping corks
Recommended Tackle
  • medium-heavy 7ft spinning rod
  • 30-50 lb braid
  • fluorocarbon leader
Where to Find Them
  • grass flats
  • oyster bars
  • marsh drains
  • deeper channel edges
Tips & Tricks
Popping cork technique attracts fish from distance. Fish moving tides.
Catch & Release Tips

Use barbless hooks, minimise air exposure, and revive fish head-first in current before release.

Regulations Summary

⚠️ Slot limits protect breeding-size fish. Verify daily bag limits.

📊 Population Dynamics

Year Region Index Notes
- - -

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) - 14 records indexed .

Occurrence density from GBIF View GBIF records ↗

👥 Community & Contribute

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View all observations for South American freshwater stingray ↗
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