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🌊 Marine 🌡️ Tropical

Largemouth striped threadfin

Polydactylus siamensis Motomura, Iwatsuki & Yoshino, 2001
Max Length
27.4 cm
Max Weight
-
Lifespan
-
Trophic Level
3.6
Depth
-
Climate
Tropical
Resilience
High
Vulnerability
23.00/100
Typical Length
-
Depth Zone
demersal

📖 Overview

Largemouth striped threadfin (Polydactylus siamensis), first described by Motomura, Iwatsuki & Yoshino, 2001 is a medium-sized fish in the family Polynemidae (order Perciformes). Adults typically reach 27.40 cm in maximum length. It inhabits marine coastal and open-ocean environments. It occurs in Tropical waters. It feeds on a mix of small fish and invertebrates as a mid-level predator.

Scientific Name
Polydactylus siamensis
Authority
Motomura, Iwatsuki & Yoshino, 2001
Habitat
Marine
Climate
Tropical
Body Shape
Fusiform / normal
Max Length
27.4 cm
Trophic Level
3.6
Resilience
High
Vulnerability
23.00/100
Salinity
30–40 ppt

🐟 Physical Description

Body with 7 or 8 prominent dark stripes along the scale rows above the lateral line; 7 - 9 faint stripes below (may be lost after preservation). Five pectoral filaments, moderately long, 31-43% of SL with 5th longest. Large upper jaw (mean 17% of SL) . Lateral line squamation unbranched, extending to upper end of lower caudal fin lobe. Lower tip of 7th proximal pterygiophore of 1st dorsal fin directed backward .: fusiform / normal.

🌀 Behaviour

Behavioural data for Largemouth striped threadfin 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; 18°N - 6°N, 92°E - 102°E known only from Bangkok, Songkhla and Phuket, Thailand.

🌿 Ecology

Zone Preferences
🌊 Marine ⬇️ Benthic
Trophic Level
3.6±0.5

📐 Morphometrics

Length–Weight Relationship: W = 0.00692 × L3.1 (TL)
Max TL
27.4cm

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
23.00/100
Low vulnerability
Trophic Level
3.6
Predator
Body Shape
Fusiform / normal
Climate Zone
Tropical
Described By
Motomura, Iwatsuki & Yoshino, 2001

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