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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.
Female red rainbowfish. The males are bright red and with age grow a high back. The females are olive brown in colour. Their colours change depending on their mood, but subordinate males do not display bright colours. They grow up to 15 cm (5.9 in) in size, but typically attain a smaller size of around 12 cm (4.7 in). [3] [4]
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 their school. If properly cared for, Rainbowfish can live up to 5 years in captivity. [5]
Axelrod's rainbowfish live in a small, narrow rainforest streams where they have been recorded around aquatic vegetation and among submerged logs and branches in slightly turbid water. The spawning season runs from October to January, each female laying between 50 and 150 eggs in batches over several days. [2]
The rainbow darter (Etheostoma caeruleum) is a small species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is native to North America where it is found in small, fast-moving streams and small to medium-sized rivers.
A female individual. The species is a large and muscular rainbowfish, generally attaining a length 15 cm (5.9 in). Individuals are a dark lavender colour at the basic level with a rosy chest. [2] Males have deeper bodies than the females, and have extended fins, as well as the back half of their bodies being coated in a reflective golden-orange.
The Melanotaenia pygmaea is known to reach the maximum recorded length of about 5.5 centimeters or about 2.1 inches as an unsexed male. A female can reach the maximum recorded length of about 3.5 centimeters or about 1.37 inches. The common length of these species is about 4 centimeters or about 1.57 inches. [2]
The Murray River rainbowfish (Melanotaenia fluviatilis), [2] known less commonly as the Australian rainbowfish, is a species of freshwater fish endemic to southeastern Australia. The southernmost species of all rainbowfishes , these fish are very colourful, hence the name; and there is sexual dimorphism with the males being larger and more ...
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