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Threadfin rainbowfish do well in aquariums of 20 US gallons (76 L), however 30 US gallons (110 L) is preferred. They are best housed in a "species only" tank; meaning that the tank is reserved for the Threadfins alone. Because of their tiny mouths, they can be difficult to feed.
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 ...
Eleutheronema tetradactylum adults show a preference for shallow muddy substrates in coastal waters and they may enter rivers. The juveniles occur in estuaries. In the winter the adults move up rivers. It is normally observed in loose schools, but larger fish are more often recorded as pairs or individuals.
Size Remarks Tank size Temperature range 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. ...
Nemipterus japonicus has its dorsal fin supported by 10 spines and 9 soft rays while the anal fin contains 3 spines and 7 soft rays. [2] Its body has a standard length that is 2.7 to 3.5 times its depth and it has a snout that is equal to in length or longer than the diameter of the eye.
These fishes vary in size from the redfin dwarf monocle bream (Parascolopsis boesemani), with a maximum published standard length of 17 cm (6.7 in), to the monogrammed monocle bream (Scolopsis monogramma) which has a maximum published total length of 38 cm (15 in).
As an example, the much lauded size of 3" max for M. boesemani is far from the 6" it can grow to if it lives 10 years in captivity. My boesemani are about 1½ years old and all are close to 3.5" already Roan Art 02:28, 7 March 2007 (UTC) Reply . Roan Art, you seem to be more knowledgeble on rainbowfish tham most of us.
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]