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

💧 Freshwater Critically Endangered 🌡️ Tropical

Giant salmon carp

Aaptosyax grypus Rainboth, 1991
Max Length
130 cm
Max Weight
30.0 kg
Lifespan
Trophic Level
4.5
Depth
Climate
Tropical
Resilience
Very low
Vulnerability
80.00/100
Typical Length
Depth Zone
pelagic

📖 Overview

Inhabits mainstreams of middle reaches in deep rocky rapids. Juveniles occur in tributaries . A large fast-swimming predator, feeding on fish of the middle and the upper water levels. Although most common along the Thai-Lao border at the mouth of the Mun River, its numbers have drastically decreased in recent years. This is perhaps due to dam construction or excessive gill netting, to which active pursuit predators, like this species, are particularly vulnerable . Undertakes upstream migration at the same time as Probarbus sp. in December-February which may be related to spawning activity . Attains over 30 kg .

Scientific Name
Aaptosyax grypus
Authority
Rainboth, 1991
Habitat
Freshwater
Climate
Tropical
Body Shape
Fusiform / normal
IUCN Status
CR
Max Length
130 cm
Max Weight
30 kg
Trophic Level
4.5
Resilience
Very low
Vulnerability
80.00/100
Migration
Potamodromous
Salinity
0–0.5 ppt

🔬 Taxonomy

Genus
Aaptosyax
Aaptosyax
Species
Giant salmon carp
Aaptosyax grypus

🐟 Physical Description

Well-developed adipose eye-lid, covering most of eye except pupil in large adults, less extensive in juveniles; presence of a large symphyseal knob in lower jaw fitting in a median notch in upper jaw .: fusiform / normal.

🌀 Behaviour

Behavioural data for Giant salmon carp is currently being reviewed.

🦐 Diet

Diet information for Giant salmon carp is currently being compiled.

🥚 Reproduction

Reproduction data for Giant salmon carp is currently being compiled.

🌍 Habitat & Distribution

Freshwater; pelagic; potamodromous . Tropical

🌿 Ecology

Zone Preferences
💧 Freshwater 🐟 Pelagic
Migration
Potamodromous
Trophic Level
4.5±0.8

📐 Morphometrics

Length–Weight Relationship: W = 0.01122 × L3.02 (TL)
Max TL
130cm
Max Weight
30,000g

🌡️ Water Parameters & Tolerance

Salinity Range
0–0.5ppt

🛡️ Conservation Assessment

IUCN Category
Critically Endangered
Assessment Date
2011

📊 Population Risk & Fisheries

Population Resilience
Very low
Minimum doubling time
Fishing Vulnerability
80.00/100
Very High vulnerability
Trophic Level
4.5
Apex / Top predator
Body Shape
Fusiform / normal
Climate Zone
Tropical
Described By
Rainboth, 1991

👥 Community & Contribute

Aquareap Community Observations
0 Observations logged on Aquareap

No observations yet — be the first to log one!

View all observations for Giant salmon carp ↗
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.