How To Care For Arapaima leptostoma
Arapaima leptostoma is a lesser-known species of Arapaima found in parts of the Amazon basin. Similar to other Arapaima species, it is a massive, air-breathing freshwater fish with an elongated body and powerful swimming ability. It may differ slightly in body shape and coloration, often appearing more slender compared to Arapaima gigas.
This species requires an extremely large aquarium or outdoor pond due to its rapid growth and huge adult size. Maintain stable water conditions with temperatures between 24°C to 30°C and a pH range of 6.0 to 7.5. Strong filtration and frequent water changes are essential.
They are carnivorous and should be fed a protein-rich diet including fish, shrimp, and other meaty foods. As air-breathers, they frequently surface to gulp air, so open surface space is necessary.
Arapaima leptostoma is generally calm but highly predatory and will consume smaller fish. Due to its enormous size and care needs, it is best kept alone or in very large systems with equally large species.
This species is suitable only for experienced aquarists or public aquariums. With proper care, it becomes a powerful and impressive display fish.
Arapaima leptostoma is a fascinating aquarium fish that stands out with its vibrant colors. It belongs to the family Arapaimidae and is native to the South America.
This species has a care level of Hard and requires a minimum tank size of 2000+ gallon. It typically reaches a size of Up to 250–300 cm.
Preferred water parameters include a specific gravity (sg) of Freshwater, pH ranging from 6.0 – 7.5, and a temperature between 24°C – 30°C. Additionally, maintaining water hardness within the range of 5-12 °dGH is essential.
For stocking, the recommended ratio is 1:1 M. The Arapaima leptostoma is widely available and has a diverse diet that includes Carnivore (fish, insects, crustaceans).
With a life span of 10–20 years, this species is known for its very easy care requirements. It is an ideal choice for both beginner and experienced aquarists. Providing a well-maintained tank environment with suitable water conditions will ensure the health and vibrancy of this captivating species.

