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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.
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 ...
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).
Also known as golden wrasse, golden rainbowfish, and canary wrasse; scientific name halichoeres chrysus. Maximum length: 5.5 inches Wild habitat: Australia, Indonesia.
Polydactylus is a genus of threadfin that mainly are native to the Indian, Atlantic and Pacific Oceans, especially in coastal or brackish waters (such as mangrove or estuaries). [ 2 ] [ 3 ] Some may even enter rivers and a single, P. macrophthalmus , is a freshwater fish from rivers in Borneo .
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]
Marine biologists have captured a rare sight of a giant pod of over 1,500 dolphins leaping and swimming off the California coast.. The “super pod” of Risso’s dolphins was spotted in Carmel ...