Arawana

The silver arowana is one of the most iconic large freshwater fish in the aquarium hobby, instantly recognisable by its sleek, elongated body, large metallic scales, and upward-facing mouth. It is native to the Amazon, Rupununi, and Oyapock river basins of South America, where it inhabits slow-moving tributaries, backwaters, and seasonally flooded forests. Adults reach an impressive 70-80 cm in standard length, with the total length including the tail approaching 90 cm in well-maintained specimens.

This is a surface-dwelling, generalised predator that feeds on fish, terrestrial insects, and fallen fruits and nuts. It is famed for its ability to leap spectacularly out of the water to catch insects, and a secure, heavy cover is absolutely essential. Despite its predatory nature, it is not overly aggressive toward tankmates too large to swallow and can be maintained with other sizable, robust species. A single specimen requires an enormous aquarium — at least 1000 litres — with excellent filtration, high dissolved oxygen, and moderate water movement. Floating or overhanging vegetation provides cover and reduces stress.

Water conditions should be 20-30°C, pH 5.0-7.5, with soft to moderately hard water. Stable water chemistry is critical and weekly water changes of 30-50% are mandatory. The silver arowana is a long-lived species, often exceeding 20 years in captivity, and develops a unique personality, often learning to take food from its keeper's hand. It is strictly for experienced aquarists with the resources to accommodate its monumental space requirements and exacting water quality needs.