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The threadfin rainbowfish was described by Herman Meinkin in 1974 from types collected in Merauke, Irian Jaya, Indonesia. [4] Meinken honoured the German aquarium fish trader Arthur Werner, who collected the type, in the specific name .
Ranging in length from 11 cm (4.5 in) in the dwarf threadfin (Parapolynemus verekeri) to 2 m (6.6 ft) in fourfinger threadfin (Eleutheronema tetradactylum) and giant African threadfin (Polydactylus quadrifilis), threadfins are both important to commercial fisheries as a food fish, and popular among anglers. Their habit of forming large schools ...
This species is a protandrous hermaphrodite and Australian studies found that they were males at fork length of 24–47 centimetres (9.4–18.5 in), hermaphrodites at fork lengths between 25–46 centimetres (9.8–18.1 in) FL and females are found at fork lengths of 28–72 centimetres (11–28 in).
Most species of rainbowfish are less than 12 cm (4.7 in) in length, with some species measuring less than 6 cm (2.4 in), while one species, Melanotaenia vanheurni, reaches lengths of up to 20 cm (7.9 in). They live in a wide range of freshwater habitats, including rivers, lakes, and swamps.
pH range Water Hardness Bleher's rainbowfish: Chilatherina bleheri: 12 cm (4.7 in) Red rainbowfish: Glossolepis incisus: 9–13 cm (3.5–5.1 in) Almost all rainbowfish species are bred in captivity and wild populations may be protected. [66] Threadfin rainbowfish: Iriatherina werneri: 3–4 cm (1.2–1.6 in) New Guinea rainbowfish ...
Polydactylus sexfilis is a medium-sized species, which attains a maximum total length of 61 centimetres (24 in) and a weight of 3.2 kilograms (7.1 lb). [1] It has a pointed snout and the head has an almost horizontal profile.
Polydactylus is a genus of threadfin that mainly are native to the Indian, Atlantic and Pacific Oceans, especially in coastal or brackish waters (such as mangrove or estuaries). [ 2 ] [ 3 ] Some may even enter rivers and a single, P. macrophthalmus , is a freshwater fish from rivers in Borneo .
Polydactylus plebeius is a medium-sized threadfin which attains a maximum total length of 45 centimetres (18 in) but is more commonly 30 centimetres (12 in). [1] It has a pointed snout and the dorsal profile of the head is nearly straight.