Asian Sun Catfish (Horabagrus brachysoma)
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Description
Species Care Guide: Asian Sun Catfish
Horabagrus brachysoma (Sun Catfish / Bullseye Catfish)
The Asian Sun Catfish (Horabagrus brachysoma), also known as the Bullseye Catfish, is a large, predatory catfish native to India. Named for the distinct black spot ringed with gold just behind its gill cover, this powerful fish requires a very large, mature aquarium due to its adult size and territorial, nocturnal feeding habits. This guide outlines the essential requirements for successfully keeping this impressive species.
I. General Characteristics and Sizing
| Characteristic | Detail |
|---|---|
| Common Name | Asian Sun Catfish, Sun Catfish, Bullseye Catfish |
| Origin | Rivers of the Western Ghats (South-West India) and Sri Lanka |
| Adult Size | Up to 35 cm (approx. 14 inches) in aquaria (larger in the wild) |
| Temperament | Predatory and Semi-Aggressive. Peaceful towards large tank mates, but will consume any fish small enough to fit in its mouth. |
| Lifespan | 10 – 15 years with appropriate care |
| Housing | Should be kept individually unless housed in a very large species-specific display. |
II. Aquarium Requirements (Husbandry)
Due to its size and active nature, the Asian Sun Catfish requires a massive, well-filtered environment.
| Requirement | Recommendation |
|---|---|
| Minimum Volume | 400 Litres (approx. 88 Imperial Gallons) for a single adult. The tank must be at least 150 cm (5 feet) long and wide enough to allow it to turn easily. |
| Filtration | Heavy-duty filtration is mandatory (canister filters or sumps). They produce significant waste and require pristine water quality. Moderate to strong water flow is appreciated. |
| Lighting | Dim or subdued. As a nocturnal species, they prefer low light. If bright lighting is used, ensure numerous dark hiding spots. |
| Substrate | Fine, smooth sand or fine gravel is best, as they are bottom dwellers. |
| Decoration | Provide ample large hiding places using thick driftwood logs, rock caves, and large PVC pipes. These spots are essential for them to rest during the day. Ensure all structures are stable and cannot be knocked over. |
III. Water Quality and Parameters
The Sun Catfish is relatively adaptable but requires very stable, clean water to prevent health issues.
| Parameter | Optimal Range | Notes |
|---|---|---|
| Temperature | 22°C – 26°C (72°F – 79°F) | Consistent stability is vital. |
| pH | 6.5 – 7.5 | Neutral to slightly alkaline water is acceptable. Avoid extremes of acidity or alkalinity. |
| Hardness (dGH) | 5 – 20 dGH (Soft to Hard) | Tolerates a wide range, but medium hardness is ideal. |
| Maintenance | Frequent, large (30–40%) weekly water changes are necessary to keep nitrate levels low, given the bioload of this large fish. |
IV. Diet and Nutrition
This catfish is a highly efficient carnivore. Feeding typically occurs in the evening or at night.
- Staple Diet: High-quality sinking catfish pellets or sticks designed for carnivorous species.
- Meaty Foods: Offer a variety of frozen and occasional live meaty foods, such as earthworms, prawns (shrimp), large pieces of white fish (cod, haddock), or mussels. Do not use mammalian meat.
- Juvenile Diet: Younger fish can be fed frozen bloodworms, and sinking pellets.
- Warning: Ensure the diet is varied to prevent deficiency and avoid overfeeding, which can lead to poor water quality.
V. Compatibility and Behaviour
The predatory nature of the Sun Catfish dictates tank mate selection.
- Tank Mates: Only house with species too large and robust to be consumed, such as large, peaceful Cichlids (e.g., Oscars, Severums), large non-aggressive community fish, large Barbs, and other similar-sized, durable bottom dwellers (e.g., large Plecos).
- Avoid: All small or mid-sized Tetras, Guppies, shrimp, snails, and Corydoras—these will be eaten. Avoid hyper-aggressive species that might harass the Sun Catfish while it rests during the day.
- Behaviour: They spend daylight hours resting in their chosen hiding spot. They become active at dusk, patrolling the substrate in search of food. They can become territorial over their favoured hiding spots.
The Asian Sun Catfish is a striking and long-lived pet, but its adult size demands careful planning. Providing the necessary space and high-quality water maintenance is essential for its well-being and longevity.
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