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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, the fourfinger threadfin, known as ranwas in India is a species of marine ray-finned fish, a threadfin from the family Polynemidae which occurs in the Indian and western Pacific Ocean.
Also known as golden wrasse, golden rainbowfish, and canary wrasse; scientific name halichoeres chrysus. Maximum length: 5.5 inches Wild habitat: Australia, Indonesia.
Same goes with Celebes rainbowfish, which belong to the Telmatherinidae (Sailfin Silversides) family. They should not be put with Rainbowfishes. Also, there is no "Australian" rainbowfish. That is a blanket name that has been given commercially to at least four different species of bows in the Melanotaenia genera.
Common name Image Taxonomy Reef safe Description Max size Black cap gramma: Gramma melacara: Yes: Purple with a black mask beginning at the mouth and ending at the base of the dorsal fin. 6 cm (2.4 in) Blue assessor: Assessor macneilli: Yes: Entirely navy blue with white edging of the dorsal fin. 7 cm (2.8 in) Royal gramma: Gramma loreto: Yes
Nemipteridae has Nemipterus as its type genus and this name is a compound of nematos, meaning "thread", and pterus, which means "fin", and this is a reference to the filaments on the dorsal and caudal fin rays of the type species of Nemipterus, Dentex filamentosus.
The giant African threadfin is, as its common name indicates, a large species of threadfin attaining a maximum total length of 200 centimetres (79 in), although the more common size is 150 centimetres (59 in). [2] It has a pointed snout and an almost straight dorsal profile on the head.