Description
Silver Arowana – Osteoglossum bicirrhosum
Introduction:
The Silver Arowana (Osteoglossum bicirrhosum) is a magnificent and iconic fish in the aquarium hobby, known for its long, sleek body and large, silver scales that shine under aquarium lighting. Reaching sizes up to 35 inches (90 cm) in captivity, this species is best suited for advanced aquarists due to its size, diet, and tank requirements. Its graceful swimming and predatory nature make it a standout addition to spacious aquariums.
1. Natural Habitat and Behavior
Native to the Amazon Basin and other slow-moving rivers in South America, the Silver Arowana inhabits floodplains, rivers, and swamps where it preys on insects, fish, and even small land animals near the water’s surface. Known for its jumping ability, it can leap out of the water to catch prey. In the aquarium, it’s an active swimmer that prefers to stay near the water’s surface and requires a secure lid to prevent escapes.
2. Aquarium Setup
A tank of at least 250 gallons is recommended due to the Arowana’s size and activity level. Water conditions should be maintained at a pH of 6.5-7.5 with temperatures between 75-82°F (24-28°C). Substrate choice is not as critical, but smooth rocks and driftwood can add to the natural look of the setup. Silver Arowanas prefer open swimming space with minimal decor that obstructs movement. Provide strong filtration and regular water changes to maintain high water quality.
3. Diet and Feeding
Silver Arowanas are carnivores, requiring a diet rich in protein. In the aquarium, they thrive on a variety of foods, including live or frozen fish, shrimp, insects, and high-quality pellets. Avoid overfeeding, as they are prone to obesity and water quality issues. Feeding should occur 2-3 times a week for adults, while juveniles benefit from smaller, more frequent meals.
4. Compatibility with Other Fish
The Silver Arowana is generally peaceful with tank mates of similar size but will prey on smaller fish. Suitable companions include large, non-aggressive fish like large cichlids, datnoids, and catfish that can hold their own but won’t pose a threat. Avoid small fish or aggressive tank mates, as they may provoke or stress the Arowana.
5. Common Challenges and Tips
- Jumping and Escaping: Silver Arowanas are excellent jumpers, so a secure, weighted lid is essential to prevent injury or escape.
- Water Quality Sensitivity: Arowanas are sensitive to water conditions; high-quality filtration and regular water changes are vital.
- Space Requirements: Given its size, this species requires a large, spacious tank, ideally suited to advanced aquarists.
Conclusion
The Silver Arowana (Osteoglossum bicirrhosum) is a truly captivating species that makes a dramatic addition to large, well-maintained aquariums. Its unique behavior, striking appearance, and high intelligence reward aquarists who can meet its special needs. With proper care, a Silver Arowana can become a centerpiece fish, admired for its beauty and elegance.
