Globe fish

The Fahaka puffer, also known as the Nile puffer or globe fish, is one of the largest freshwater puffer species and a fascinating but challenging aquarium inhabitant. Native to a wide stretch of Africa from Senegal to Egypt, it inhabits various lakes and rivers, frequenting both open water and sheltered, heavily vegetated areas. This species is a molluscivore in nature, equipped with powerful beak-like teeth that grow continuously and must be kept worn down through regular feeding of snails, unshelled shellfish, crab legs, and mussels. It also accepts worms and other live and frozen foods.

Temperament is the defining consideration with this fish — it is generally aggressive and intolerant, capable of biting chunks from tankmates with its beak-like mouth, and is best maintained alone. Even conspecifics are typically attacked, so group keeping demands an enormous tank and careful management. A single specimen requires a minimum of 450 litres with a sandy substrate, smooth rocks, driftwood, and plenty of open swimming space. Plants may be added but expect bite marks on leaves.

Water parameters should be tropical: 24-26°C, pH 6.5-7.5, with moderate hardness. The Fahaka develops a distinctive personality and will learn to interact with its owner, changing colour according to mood and surroundings. It can inflate itself dramatically when threatened or seeking attention, reaching two to three times its normal size. Like all puffers, its body contains tetrodotoxin, but this poses no risk to the aquarist during normal maintenance.