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Common name: Blue arowana
Scientific name: Osteoglossum cf. ferreirai
Origin: This fish was captured on the Colombia-Venezuela border, in the same region as Uaru fernandezyepezi.
Size: Up to 120cm/4′, but 90cm/36″ is considered large in captivity. Arowana, particularly the more common Silver arowana, are a popular food fish and I saw many on sale at the local fish markets of Manaus, Brazil, most of which measured about 100cm/39″.
Diet: Arowana are surface-dwelling omnivores. Stomach content analyses of wild fish have shown that they feed on spiders, beetles, grasshoppers, terrestrial insects, plants and fish. In captivity, they’ll do well on cichlid pellets and chunks of defrosted frozen fish.
Water: Ideally neutral or slightly soft and acidic, but fairly adaptable in captivity. It’s usually not a problem to keep them in harder water.
Aquarium: These peaceful fish mix well with other large fish, but need very big tanks with lots of free-swimming room. A 183 x 61 x 61cm/6′ x 2′ x 2′ tank should be the minimum, but longer and wider is better. Apart from their size, they’re easy to keep and become tame enough to feed from your hand. Install an oversized filtration system to handle the high ammonia wastes. Don’t keep them with anything small (they’ll eat them) or anything too aggressive (the arowana will get injured or will jump out, potentially smashing any cover glasses).