Silver Arowana (Osteoglossum bicirrhosum)
The Silver Arowana is a captivating freshwater fish native to the Amazon Basin in South America. Known for its elongated body, reflective silver scales, and long pectoral fins, this species is a popular choice among aquarists seeking a striking and majestic inhabitant for their aquarium.
Physical Characteristics:
Size: Silver Arowanas can grow quite large, typically reaching lengths of 90-120 cm (35-47 inches) in well-maintained aquariums, though some individuals can exceed this size.
Colouration: They are characterised by their metallic silver body, which can have subtle hints of blue or green under certain lighting conditions. Their long, flowing fins add to their elegant appearance.
Shape: The Silver Arowana has a streamlined, elongated body that allows it to swim with grace and speed. Its distinctive head shape, with a pointed snout and large eyes, contributes to its predatory nature.
Behaviour:
Temperament: Silver Arowanas are generally peaceful but can exhibit territorial behaviour as they mature. They may show aggression towards smaller fish or those that invade their space.
Activity Level: These fish are active swimmers and are often seen gliding through the water. They require ample swimming space to thrive and exhibit their natural behaviour.
Community Behaviour: Silver Arowanas are best kept with larger fish that can hold their own, as they may see smaller fish as prey. Careful selection of tankmates is crucial to prevent stress and aggression.
Aquarium Care:
Tank Size: Due to their potential size, a minimum tank size of 300 litres (80 gallons) is recommended for a single Silver Arowana. Larger tanks provide more swimming space and help maintain water quality.
Water Parameters:
Temperature: Silver Arowanas thrive in warm water, with an ideal temperature range of 24°C to 28°C (75°F to 82°F).
pH: They prefer slightly acidic to neutral water, with a pH range of 6.0 to 7.5.
Hardness: Soft to moderately hard water, with a general hardness (GH) of 5-15 dGH, is ideal.
Tank Setup: A well-decorated tank with open swimming space is essential. Use a soft substrate and include hiding spots such as driftwood and plants to create a more natural environment. Ensure there are no sharp edges that could damage their delicate fins.
Diet:
Silver Arowanas are carnivorous and require a varied diet to maintain their health and vibrant appearance. Their diet should include:
High-quality pellets formulated for carnivorous fish.
Live or frozen foods such as shrimp, fish, and insects to provide essential protein and variety.
Occasional treats of fish fillets or earthworms can be offered, but should not replace their staple diet.
Tankmates:
Silver Arowanas can be housed with various larger fish that won't be seen as food. Suitable tankmates include:
Large tetras, such as Silver Dollars.
Catfish species, like larger Plecos or Armoured Catfish.
Other peaceful, larger freshwater fish that share similar water requirements.
Breeding:
Breeding Silver Arowanas in captivity is rare and not well-documented. They typically require specific environmental conditions and a large breeding setup. Most aquarium hobbyists keep them as solitary specimens.
Conservation Status:
Silver Arowanas are not currently considered endangered, but their populations can be affected by habitat destruction and pollution. Sustainable practices are essential to ensure their availability in the aquarium trade.
In summary, the Silver Arowana is a magnificent addition to freshwater aquariums. With proper care and a suitable environment, they can thrive and become a stunning feature in any aquarist's collection.
