The blue arowana (Osteoglossum Ferreirai) is a large fish found in the Negro River basin of Brazil and Colombia and the upper Essequibo River basin of Guyana in South America. This fish grows to an adult size of up to 48 inches long. It can be very difficult to determine the sex of arowanas, although it is probable that males will have a larger head as they are paternal mouth brooders.
Blue arowanas are also sometimes known as black arowanas because they are black and white when very young. As a blue arowana grows and matures, the coloration turns a silvery blue.
Blue arowanas prefer a temperature of 75°F to 82°F. They will do well with a pH of 6.0 to 7.0, and a hardness from 1 to 12°H or higher.
Adult blue arowanas should be maintained in an aquarium of 210 gallons or larger. Juveniles may be maintained in an aquarium of 40 gallons or larger. Keep in mind that floor space is more important than height and that lots of open swimming area should be provided. Decorate with rock work, driftwood (ZM2000) and sturdy live or artificial plants such. A dark colored soft, sandy substrate (CS6631) is a good choice for bringing out the best color. Arowanas are strong jumpers, so a sturdy and tight fitting lid is a must.
The blue arowana grows very large. Tank mates should be chosen with care. Do not keep with fish small enough to be swallowed. Possible tank mates include larger, somewhat peaceful cichlids, catfish, and freshwater stingrays. Do not keep aggressive fish that may harass the arowana.
In the wild, the blue arowana is a surface dwelling omnivore that feeds on spiders, beetles, grasshoppers, terrestrial insects, plants and fish. In the aquarium it may be conditioned to accept frozen and pelleted foods. Good choices include high quality arowana sticks (AZ231) and frozen krill (SF7136). For maximum color, growth, and health these fish will look their best when given probiotics (AL169) in addition to a balanced diet.