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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.
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 ...
Otherwise, an option would be to leave it at "size", but with a footnote from where it says "size" in the header, that indicates that it is "size at maturity". --Tryptofish 17:56, 12 December 2017 (UTC) Fishbase tends to list maximum size, with question marks for size at maturity.
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 king threadfin is a large threadfin which can attain a maximum total length of 170 centimetres (67 in) and a maximum published weight of 45 kilograms (99 lb), although the more common total length is 48 centimetres (19 in). [1] It has a pointed snout and the dorsal profile of the head is almost flat in young fish and concave in adults.
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.