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🌊 Marine Near Threatened 🍽️ Edible 🎣 Game Fish ⚠️ Venomous ⚡ Venomous 🌡️ Subtropical

Whip stingray

Hemitrygon akajei Müller & Henle, 1841
Hemitrygon Akajei (Hemitrygon akajei)
Hemitrygon Akajei (Hemitrygon akajei)
Max Length
200 cm
Max Weight
10.7 kg
Lifespan
-
Trophic Level
3.8
Depth
10–50 m
Climate
Subtropical
Resilience
Low
Vulnerability
74.00/100
Typical Length
100 cm
Depth Zone
demersal

📖 Overview

Found in coral reefs and estuarine areas, on sand and mud bottoms . Feeds on small fishes and crustaceans . Ovoviviparous with litters of only 1 pup while earlier estimates indicated production of up to 10 in a litter . Caught occasionally by bottom trawl fisheries operating inshore. Utilized for its meat but of limited value due to its small size. Served in 'miso' soup, hard boiled with seasonings, or for 'kamaboko' material .

Scientific Name
Hemitrygon akajei
Authority
Müller & Henle, 1841
Habitat
Marine
Climate
Subtropical
Body Shape
Other
IUCN Status
NT
Max Length
200 cm
Max Weight
10.7 kg
Depth Range
10–50 m
Trophic Level
3.8
Resilience
Low
Vulnerability
74.00/100
Migration
Oceanodromous
Salinity
30–40 ppt

🐟 Physical Description

Disc rhomboid, anterior margin straight, posterior margin convex. Snout triangular and slightly produced. dorsal keel present on tail. Adults with small spines on disc and posterior part of tail. Brown dorsally and some with orangish pectoral fin margins, in front of eyes, behind spiracles, on the sides of the tail just anterior to the sting. Ventrum orangish red.: other.

🌀 Behaviour

Behavioural data for Whip stingray is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

Size at Maturity
44cm TL

Exhibit ovoviparity (aplacental viviparity), with embryos feeding initially on yolk, then receiving additional nourishment from the mother by indirect absorption of uterine fluid enriched with mucus, fat or protein through specialised structures . Distinct pairing with embrace .

🌍 Habitat & Distribution

Marine; brackish; demersal; oceanodromous ; depth range 10 - 50 m . Subtropical; 43°N - 23°N Northwest Pacific: central China to northern Japan.

🌿 Ecology

Zone Preferences
🌊 Marine 🌿 Brackish ⬇️ Benthic
Migration
Oceanodromous
Trophic Level
3.8±0.58
Food Items

small fishes and crustaceans (Ref

📐 Morphometrics

Length–Weight Relationship: W = 0.00447 × L3.12 (TL)
Max TL
200cm
Max Weight
10,700g

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Near Threatened
Assessment Date
2019

📊 Population Risk & Fisheries

Population Resilience
Low
Minimum doubling time
Fishing Vulnerability
74.00/100
High vulnerability
Trophic Level
3.8
Predator
Body Shape
Other
Climate Zone
Subtropical
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 cytotoxic
Delivery
serrated caudal spine (barb)
Potency
Severe
Mortality Risk
Low
Symptom Onset
5min
Duration
24.0hrs
Antivenom
✗ Not Available
Named Toxins
phosphodiesterase 5-nucleotidase cardiotoxin peptides
Symptoms
  • intense pain
  • laceration
  • oedema
  • retained spine fragments possible
Affected Body Systems
cardiovascular muscular
First Aid
Hot water immersion. Do not remove embedded barb from chest or abdomen - medical removal only.
Medical Treatment

Wound care, imaging for retained spine, tetanus prophylaxis, antibiotic prophylaxis for marine wounds.

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.

🍽️ Edibility & Flavour

"Whip stingray 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 Whip stingray is currently being compiled from USDA FoodData Central.

🔬 Mercury Safety

Mercury data for Whip stingray 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

🔬 Full Nutritional Profile

Per 100g - Raw, per 100g - Source: USDA FoodData Central templates (generic fish average)

Proximate Composition
Energy125 kcal
Moisture75 %
Protein20 %
Total Fat4 %
Ash1.3 %
Fatty Acids (g)
Saturated Fat1 g
Monounsaturated Fat1.2 g
Polyunsaturated Fat1.5 g
Omega-3 Total1 g
EPA0.3 g
DHA0.5 g
Omega-6 Total0.3 g
Key Minerals & Vitamins
Calcium20 mg
Iron0.7 mg
Magnesium30 mg
Phosphorus220 mg
Potassium380 mg
Sodium55 mg
Zinc0.5 mg
Selenium32 µg
Vitamin B122 µg

📊 Population Dynamics

Year Region Index Notes
- - -

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) - 21 records indexed .

Occurrence density from GBIF View GBIF records ↗

👥 Community & Contribute

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