Green Arowana: The Dragon Fish from Southeast Asia

History and Origin

The Green Arowana (Scleropages formosus) is native to the freshwater rivers and swamps of Southeast Asia, particularly in Thailand, Myanmar, Laos, Cambodia, Vietnam, and Indonesia. Known as the 'dragon fish' due to its resemblance to the Chinese dragon, it has been revered in Asian cultures for centuries as a symbol of luck, prosperity, and strength. In the wild, they inhabit blackwater rivers with dense vegetation and slow-moving currents. Due to overfishing and habitat loss, the Green Arowana is listed as endangered in the IUCN Red List. However, captive breeding programs have made them available in the aquarium trade, often under strict regulations.

Appearance

Green Arowanas are large, elongated fish with a distinctive dragon-like appearance. They have a tapered body with large, overlapping scales that shimmer in shades of green to dark grey, depending on the light and mood. Juveniles display a vibrant blue-green sheen that matures into a more subdued metallic green. Adults can reach 24-36 inches (60-90 cm) in length and weigh up to 6-10 pounds (2.7-4.5 kg). Their dorsal and anal fins are long and positioned far back, while the pectoral fins are large and wing-like. The most striking feature is their pair of barbels on the lower jaw, which resemble a dragon's whiskers. Their eyes are large and forward-facing, giving them excellent vision for hunting.

Personality and Behavior

Green Arowanas are intelligent and curious fish with a strong predatory instinct. They are known for their ability to jump out of water to catch insects, birds, or other prey, so a tight-fitting lid is essential. In captivity, they can recognize their owners and may even take food from hand. However, they are territorial and can be aggressive towards tank mates, especially smaller fish. They thrive in a calm, stress-free environment with ample space. These fish are also known for their labyrinth organ, allowing them to breathe atmospheric air, which they do occasionally at the surface.

Suitable Owners

• Families with children: Not ideal if children are likely to tap the glass or make sudden movements, as this can stress the fish. However, older children who appreciate the fish's beauty may enjoy watching it.
• Apartment dwellers: Only if you can accommodate a very large tank (200+ gallons) and have a stable floor. The tank's weight (over 2,000 lbs when filled) may not be suitable for upper floors.
• First-time fish keepers: Not recommended. Green Arowanas require experienced care, large tanks, and stable water parameters. They are expensive and have specific dietary and environmental needs.

Exercise and Mental Stimulation

Green Arowanas are active swimmers that need ample space to exercise. A tank of at least 200-250 gallons for an adult is necessary. Provide open swimming areas and some hiding spots like driftwood or large plants. They enjoy interactive feeding; using feeding tongs to hand-feed or dropping live insects on the surface can stimulate their natural hunting behavior. Regular feeding schedules and occasional rearrangement of decor can provide mental stimulation.

Grooming and Shedding

Fish require minimal grooming. Maintain water quality with 30% weekly water changes and a high-quality filtration system. Green Arowanas do shed their slime coat occasionally; this is normal and helps protect against parasites. Handle them only when necessary, using a soft net. If the fish shows signs of injury or disease, treat promptly with aquarium salts or medications.

Health and Lifespan

Common health issues include dropsy, ich, fin rot, and hole-in-the-head disease (often due to poor water quality or nutritional deficiencies). They are also prone to spinal deformities if kept in too small tanks. A balanced diet of live food (crickets, worms, small fish), pellets, and occasional vegetables helps prevent disease. With proper care, Green Arowanas can live 10-15 years or even longer, up to 20 years.

Cost

Initial setup costs for a tank, filter, heater, and decor can exceed $2,000.