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🌊 Marine Least Concern 🌡️ Tropical

Big-snout croaker

Johnius macrorhynus Lal Mohan, 1976
Max Length
30 cm
Max Weight
-
Lifespan
5 yrs
Trophic Level
3.5
Depth
-
Climate
Tropical
Resilience
Medium
Vulnerability
22.00/100
Typical Length
22 cm
Depth Zone
-

📖 Overview

Big-snout croaker (Johnius macrorhynus) is a ray-finned fish of the family Sciaenidae. It inhabits marine (saltwater) waters. This species can reach a maximum total length of 30 cm. With a trophic level of 3.5, it is a low-level carnivore, feeding on invertebrates and small organisms. It is assessed as Least Concern on the IUCN Red List.

Scientific Name
Johnius macrorhynus
Authority
Lal Mohan, 1976
Habitat
Marine
Climate
Tropical
Body Shape
Fusiform / normal
IUCN Status
LC
Max Length
30 cm
Lifespan
5 years
Trophic Level
3.5
Resilience
Medium
Vulnerability
22.00/100
Salinity
30–40 ppt

🐟 Physical Description

Dorsal spines (total): 11; Dorsal soft rays (total): 27 - 30; Anal spines: 2; Anal soft rays: 7. Lower part of body with a golden tinge; pectoral, pelvic and anal fins yellow; a faint steel blue blotch on gill cover .: fusiform / normal.

🌀 Behaviour

Behavioural data for Big-snout croaker is currently being reviewed.

🦐 Diet

Diet information for Big-snout croaker is currently being compiled.

🥚 Reproduction

Reproduction data for Big-snout croaker is currently being compiled.

🌍 Habitat & Distribution

Marine; benthopelagic. Tropical South China Sea, Borneo and the Malay Peninsula.

🌿 Ecology

Zone Preferences
🌊 Marine
Trophic Level
3.5±0.4

📐 Morphometrics

Length–Weight Relationship: W = 0.00776 × L3.05 (TL)
Max TL
30cm
Dorsal Spines
11
Dorsal Rays
29
Anal Spines
2
Anal Rays
7

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2019

📊 Population Risk & Fisheries

Population Resilience
Medium
Minimum doubling time
Fishing Vulnerability
22.00/100
Low vulnerability
Trophic Level
3.5
Predator
Body Shape
Fusiform / normal
Climate Zone
Tropical
Described By
Lal Mohan, 1976

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