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🌊 Marine Data Deficient 🌡️ Tropical

Mannar croaker

Johnius mannarensis Lal Mohan, 1971
Max Length
16 cm
Max Weight
-
Lifespan
-
Trophic Level
3.4
Depth
-
Climate
Tropical
Resilience
High
Vulnerability
17.00/100
Typical Length
-
Depth Zone
demersal

📖 Overview

Mannar croaker (Johnius mannarensis) is a ray-finned fish of the family Sciaenidae. It inhabits marine (saltwater) waters in benthic environments. This species can reach a maximum total length of 16 cm. With a trophic level of 3.4, it is a low-level carnivore, feeding on invertebrates and small organisms. It is assessed as Data Deficient on the IUCN Red List.

Scientific Name
Johnius mannarensis
Authority
Lal Mohan, 1971
Habitat
Marine
Climate
Tropical
Body Shape
Fusiform / normal
IUCN Status
DD
Max Length
16 cm
Trophic Level
3.4
Resilience
High
Vulnerability
17.00/100
Salinity
30–40 ppt

🐟 Physical Description

Dorsal soft rays (total): 27 - 30. Scales small. Head scales all cycloid. Total number of scales above and below the lateral line 19-23 (mean= 20).: fusiform / normal.

🌀 Behaviour

Behavioural data for Mannar croaker is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Oviparous 📦 Batch Spawner
Spawning Season
spring-summer
Spawn Location
Pelagic
Fertilization
External

🌍 Habitat & Distribution

Marine; demersal. Tropical southeast coasts of India and Sri Lanka.

🌿 Ecology

Zone Preferences
🌊 Marine ⬇️ Benthic
Trophic Level
3.4±0.4

📐 Morphometrics

Length–Weight Relationship: W = 0.00891 × L3.07 (TL)
Max TL
16cm
Dorsal Rays
29

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Data Deficient
Assessment Date
2018

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
17.00/100
Low vulnerability
Trophic Level
3.4
Predator
Body Shape
Fusiform / normal
Climate Zone
Tropical
Described By
Lal Mohan, 1971

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