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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.
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).
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 ...
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) Boeseman's rainbowfish: Melanotaenia boesemani: 10–13 cm (3.9–5.1 in) Lake Kurumoi rainbowfish
Rainbowfish usually eat floating flakes in captivity, because in the wild they will often eat insects floating on the surface. In a home setting, these fish need well-oxygenated water with a pH level of 6.8 – 7.2, optimal temperatures varying between 72 and 82 °F (22 and 28 °C), and plenty of aquatic plants to give them hiding places amid ...
The Atlantic threadfin is a medium-sized species of threadfin which grows to a maximum total length of 30 centimetres (12 in), although most fish have a total length of around 25 centimetres (9.8 in). [2] It has a pointed snout and an almost straight dorsal profile on its head. [3]
The anal fin has 3 spines and 11 or 12 soft rays and has a base which is roughly equal in length to that of the second dorsal fin. The pectoral fin has 16 to 18 unbranched rays and has a mean length of one fifth of the standard length and its tip does not extend to the tip of the pelvic fin .
The royal threadfin is a medium-sized threadfin species reaching a maximum total length of 35 centimetres (14 in), although a more normal length is 25 centimetres (9.8 in). [2] It has two separate dorsal fins, the first dorsal fin has 8 spines and the second dorsal fin has a single spine and 14 or 15 soft rays.