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The male courts the female by posturing in front of her quickly raising then lowering the forward dorsal fin repeatedly. The recommended male-to-female ratio is about 1:3, due to the polygamous behavior of dominant males. Threadfin rainbowfish do well in aquariums of 20 US gallons (76 L), however 30 US gallons (110 L) is preferred.
It feeds largely on crustaceans and fishes. They reach sexual maturity as males when they attain a fork length of 20–25 centimetres (7.9–9.8 in) and then changing sex to fertile females after an intermediate hermaphrodite stage when they reach a fork length of 30–40 centimetres (12–16 in). Spawning is governed by the phases of the moon. [2]
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 ...
Also known as golden wrasse, golden rainbowfish, and canary wrasse; scientific name halichoeres chrysus. Maximum length: 5.5 inches Wild habitat: Australia, Indonesia.
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: Melanotaenia affinis: 13 cm (5.1 in)
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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).
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