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Diadromous Least Concern 🌡️ Tropical

Common ponyfish

Leiognathus equula Forsskål, 1775
Max Length
28 cm
Max Weight
-
Lifespan
-
Trophic Level
3
Depth
10–110 m
Climate
Tropical
Resilience
High
Vulnerability
17.00/100
Typical Length
18 cm
Depth Zone
demersal

📖 Overview

Found in river mouths and muddy inshore areas , often in mangrove areas . Adults are coastal inhabitants found on soft bottoms, usually between depths of 10-70 meters. Juveniles are commonly found in mangrove estuaries and tidal creeks, sometimes entering the lower reaches of freshwater streams . Adults move in schools. Frequently ascend into freshwater reaches of rivers . Active by day . Feed on polychaetes, small crustaceans, small fishes and worms . Important food fish in the tropics . Caught near the bottom with bottom trawls, set nets, push nets, dip nets, and beach seines. In Indian waters, schools near the surface during April-May when caught with drift gill nets. Larger specimens sorted for human consumption and marketed fresh or dried-salted, but surplus fish used to feed ducks, converted to fishmeal, or discarded .

Scientific Name
Leiognathus equula
Authority
Forsskål, 1775
Habitat
Diadromous
Climate
Tropical
Body Shape
Short and / or deep
IUCN Status
LC
Max Length
28 cm
Depth Range
10–110 m
Latitude
34°S – 31°N
Trophic Level
3
Resilience
High
Vulnerability
17.00/100
Migration
Amphidromous
Water Temp
26–29 °C
Salinity
30–40 ppt

🐟 Physical Description

Dorsal spines (total): 8; Dorsal soft rays (total): 15 - 16; Anal spines: 3; Anal soft rays: 14 - 15. This species is distinguished by the following characters: body very deep, compressed, with a strongly humped back; body depth 1.7-1.9 times in standard length; mouth pointing downward when protracted; gill rakers short and fleshy, less than 1/2 length of corresponding gill lamellae, total gill rakers on first gill arch 18-22; head and breast scaleless; tubed scales on lateral line 61-66. Colour of adults, back greyish, belly silvery and many parallel close-set faint bars on back; usually a dark brown saddle on caudal peduncle; axil of pectoral fins grey to black; margin of soft dorsal fin black; both caudal-fin lobes with broad dusky margins; pectoral, pelvic, and anal fins colourless to yellowish. In juveniles (5-7 cm TL), thin, closely arranged, grey vertical lines descending from back to about midheight; membrane between anal-fin spines conspicuously yellow; posterior margin of caudal-fin lobes pale yellow and dusky; other fins hyaline; snout dotted black .: short and / or deep; Cross section: compressed.

🌀 Behaviour

Behavioural data for Common ponyfish is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

Size at Maturity
10.7cm TL

🌍 Habitat & Distribution

Marine; freshwater; brackish; demersal; amphidromous; depth range 10 - 110 m . Tropical; 26°C - 29°C ; 31°N - 34°S, 27°E - 170°W West Pacific: Red Sea, Persian Gulf and East Africa (including Reunion, Comoros, Seychelles, Madagascar and Mauritius) to Fiji, north to the Ryukyu Islands, south to Australia.

🌿 Ecology

Zone Preferences
🌊 Marine 💧 Freshwater 🌿 Brackish ⬇️ Benthic
Migration
Amphidromous
Trophic Level
3±0.37
🐠 Schooling
Food Items

polychaetes, small crustaceans, small fishes (Ref

📐 Morphometrics

Length–Weight Relationship: W = 0.01479 × L3.09 (TL)
Max TL
28cm
Dorsal Spines
8
Dorsal Rays
16
Anal Spines
3
Anal Rays
15

🌡️ Water Parameters & Tolerance

Temperature Range
26–29°C
Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2016

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
17.00/100
Low vulnerability
Trophic Level
3
Predator
Body Shape
Short and / or deep
Climate Zone
Tropical
Latitude Range
31°N – 34°S
Described By
Forsskål, 1775

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