Fin's Fish Guide
The Smallmouth threadfin (Polydactylus microstomus) is a brackish-water fish of the family Polynemidae that grows up to 25 cm.
Description
The smallmouth threadfin is a threadfin (Polynemidae) from the Indo-West Pacific. The species has an elongate, silvery body with a projecting snout and a small, inferior mouth. Below the pectoral fin it bears free, thread-like fin rays that serve as feelers to detect prey on the bottom in turbid water. It inhabits coastal waters and estuaries over soft bottoms. It feeds on small crustaceans, worms and small fishes. The species is harmless to humans.
Frequently asked questions
How do you recognise the Smallmouth threadfin?
The Smallmouth threadfin is mainly silver-grey and shows a plain pattern. Free, filamentous pectoral fin rays acting as feelers to detect prey in turbid water.
Where does the Smallmouth threadfin live?
The Smallmouth threadfin lives in brackish water and is mostly found around sand or mud bottom. Indo-West Pacific; coastal waters and estuaries.
How big does the Smallmouth threadfin get?
The Smallmouth threadfin grows to a maximum of about 25 cm. On average the species is around 15 cm.
Is the Smallmouth threadfin dangerous to humans?
No, the Smallmouth threadfin is harmless to humans. None required: this species is harmless to humans.
Is the Smallmouth threadfin edible?
Yes, the Smallmouth threadfin is commonly eaten.
More photos
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All data
Identification
Appearance
Habitat & distribution
Behaviour & biology
Safety
Status & sources
Same genus Polydactylus
More from the family Polynemidae
Want the complete picture on the Smallmouth threadfin?
Point your camera at the fish and Fin names the species in seconds. Free, and the Smallmouth threadfin is one of 12,519 species in the app.