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💧 Freshwater Critically Endangered 🌡️ Tropical

Hump-backed mahseer

Tor remadeviae Madhusoodana Kurup & Radhakrishnan, 2011
Max Length
175 cm
Max Weight
54.0 kg
Lifespan
-
Trophic Level
2.8
Depth
-
Climate
Tropical
Resilience
Very low
Vulnerability
86.00/100
Typical Length
-
Depth Zone
-

📖 Overview

While functional habitats are yet to be elucidated, T. remadevii inhabits the middle to upper reaches of the River Cauvery and some of its tributaries. Mesohabitat utilization is known to incorporate shallow high velocity rapids to deep, slow flowing pools, with substrates typically composed of bedrock and boulders .

Scientific Name
Tor remadeviae
Authority
Madhusoodana Kurup & Radhakrishnan, 2011
Habitat
Freshwater
Climate
Tropical
IUCN Status
CR
Max Length
175 cm
Max Weight
54 kg
Trophic Level
2.8
Resilience
Very low
Vulnerability
86.00/100
Salinity
0–0.5 ppt

🐟 Physical Description

Dorsal spines (total): 4; Dorsal soft rays (total): 9; Anal spines: 2; Anal soft rays: 5. This species is characterised by having D IV,9; A II,5. It differs from its congeners in India by the following: a prominent hump originating above the pre-opercle and extending to the origin of the dorsal fin; a well-developed mandible resulting in a terminal or slightly superior mouth position; the dorsal orientation of the eyes; a distinctive kink in the profile of the pre-opercle, a consistent feature in T. remadevii and not observed in other South Indian Tor. Similar to other Tor species the mouth morphology is highly variable, with some individuals exhibiting hypotrophic lips and sub-terminal mouth with enlarged mentum. Colouration of the body varies (silver, bronze, greenish) and is not considered a reliable diagnostic character; the orange coloration of the caudal fin (sometimes extending to all fins) is considered a more consistent character.Cross section: compressed.

🌀 Behaviour

Behavioural data for Hump-backed mahseer 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. Tropical

🌿 Ecology

Zone Preferences
💧 Freshwater
Trophic Level
2.8±0.2

📐 Morphometrics

Length–Weight Relationship: W = 0.00912 × L3 (TL)
Max TL
175cm
Max Weight
54,000g
Dorsal Spines
4
Dorsal Rays
9
Anal Spines
2
Anal Rays
5

🌡️ Water Parameters & Tolerance

Salinity Range
0–0.5ppt

🛡️ Conservation Assessment

IUCN Category
Critically Endangered
Assessment Date
2018

📊 Population Risk & Fisheries

Population Resilience
Very low
Minimum doubling time
Fishing Vulnerability
86.00/100
Very High vulnerability
Trophic Level
2.8
Omnivore / Planktivore
Climate Zone
Tropical
Described By
Madhusoodana Kurup & Radhakrishnan, 2011

🦠 Common Diseases

The following diseases are known to affect Hump-backed mahseer.

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