Blackspot threadfin (Polydactylus sextarius)

Scientific name: Polydactylus sextarius Bloch & Schneider, 1801

Blackspot threadfin (Polydactylus sextarius)

The Blackspot threadfin (Polydactylus sextarius) is a brackish-water fish of the family Polynemidae.

Biology

Dorsal spines (total): 9; Dorsal soft rays (total): 12-13; Anal spines: 3; Anal soft rays: 11 - 13; Vertebrae: 24. With 6 pectoral filaments; uppermost not reaching posterior tip of pectoral fin. Pectoral fin, rays moderate, 19-25% of SL; all rays branched except uppermost 1 or 2. Second dorsal spine short, 5-8% of SL. Atrophied swim bladder, like a string. A large black spot anteriorly on lateral line. No upper lip; lower lip well-developed except at symphysis. Operculum broadly rounded; preoperculum coarsely serrated. Color is golden-olive above,silvery below. A large oval blotch is at the start of the lateral line.

Source: FishBase, licensed CC BY-NC 4.0.

Species facts

Scientific name
Polydactylus sextarius
Family
Polynemidae (Threadfins)
Order
Perciformes (Perch-like fish)
Class
Actinopterygii (Ray-finned fishes)
Maximum length
30.0
Common length
20.0
Depth range
16–73 m (52–240 ft)
Environment
Marine; brackish; demersal; amphidromous; depth range 16 - 73 m
Climate
Tropical
Distribution
Eastern Indian Ocean and Western Pacific: southwestern India to Papua New Guinea, north to Japan. May rarely occur in the Philippines, eastern Indonesia, and Papua New Guinea.
Conservation status (IUCN)
Not Evaluated
Threat to humans
Harmless
Uses
Fisheries: commercial; gamefish: yes
Resilience
High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.)

Sources

Taxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.

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