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🌊 Marine 🌡️ Tropical

Slender fivefinger threadfin

Polydactylus bifurcus Motomura, Kimura & Iwatsuki, 2001
Max Length
27 cm
Max Weight
-
Lifespan
-
Trophic Level
3.6
Depth
0–5 m
Climate
Tropical
Resilience
High
Vulnerability
23.00/100
Typical Length
-
Depth Zone
demersal

📖 Overview

Slender fivefinger threadfin (Polydactylus bifurcus), first described by Motomura, Kimura & Iwatsuki, 2001 is a medium-sized fish in the family Polynemidae (order Perciformes). Adults typically reach 27.00 cm in maximum length. It inhabits marine coastal and open-ocean environments. Recorded depth range: 0 to 5 metres. It occurs in Tropical waters. It feeds on a mix of small fish and invertebrates as a mid-level predator.

Scientific Name
Polydactylus bifurcus
Authority
Motomura, Kimura & Iwatsuki, 2001
Habitat
Marine
Climate
Tropical
Body Shape
Elongated
Max Length
27 cm
Depth Range
0–5 m
Latitude
9°S – 2°N
Trophic Level
3.6
Resilience
High
Vulnerability
23.00/100
Salinity
30–40 ppt

🐟 Physical Description

Dorsal spines (total): 9; Dorsal soft rays (total): 13; Anal spines: 3; Anal soft rays: 11. Body with 8 faint stripes along longitudinal scale rows above lateral line. Pectoral filaments 5. Second spine of dorsal fin very strong, 2.5 times width of 3rd spine. Lateral line bifurcated on caudal fin base, extending to posterior margins of upper and lower caudal fin lobes .: elongated; Cross section: compressed.

🌀 Behaviour

Behavioural data for Slender fivefinger 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; depth range 0 - 5 m . Tropical; 2°N - 9°S, 96°E - 117°E Indian Ocean: Indonesia.

🌿 Ecology

Zone Preferences
🌊 Marine ⬇️ Benthic
Trophic Level
3.6±0.5

📐 Morphometrics

Length–Weight Relationship: W = 0.00537 × L3.06 (TL)
Max TL
27cm
Dorsal Spines
9
Dorsal Rays
13
Anal Spines
3
Anal Rays
11

🌡️ 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
Elongated
Climate Zone
Tropical
Latitude Range
2°N – 9°S
Described By
Motomura, Kimura & Iwatsuki, 2001

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