Description
Columbian Shark Catfish – Ariopsis seemanni
Introduction:
The Columbian Shark Catfish (Ariopsis seemanni), also known as the Black-Finned Shark or Silver-Tip Shark, is an impressive species recognized for its sleek appearance and shark-like body. With a size range of 10-14 inches (25-35 cm) in captivity, it requires a spacious tank and specific care to thrive. Its dynamic swimming style and unique appearance make it a captivating choice for experienced aquarists interested in a brackish or marine aquarium setup.
1. Natural Habitat and Behavior
Native to the rivers and coastal estuaries of Central and South America, the Columbian Shark Catfish typically lives in brackish environments, transitioning to full marine conditions as it matures. In the wild, it is known for its schooling behavior and migratory nature, often swimming in groups. This species is highly active and spends much of its time in the mid-to-lower water columns, patrolling the tank with its shark-like movements.
2. Aquarium Setup
The Columbian Shark Catfish needs a large tank due to its size and active nature. A 75-gallon tank or larger is recommended, especially if keeping a group. The tank should have an open swimming area, with minimal decorations and a sandy or fine gravel substrate to prevent injury to their sensitive barbels. As they mature, they require a brackish environment with a specific gravity (SG) of 1.005-1.010, gradually moving to marine salinity (SG 1.020-1.025) as they grow. Maintain a temperature between 75-82°F (24-28°C) and a pH of 7.5-8.5. A strong filtration system is essential due to their size and waste production, and a moderate current is beneficial.
3. Diet and Feeding
The Columbian Shark Catfish is omnivorous, with a strong preference for meaty foods. In captivity, they thrive on a varied diet that includes high-quality sinking pellets, bloodworms, brine shrimp, and small fish. They may also accept vegetable matter, such as spirulina-based foods. Feed twice a day, offering portions they can consume within a few minutes to prevent overfeeding and water quality issues.
4. Compatibility with Other Fish
This species is generally peaceful but may prey on smaller fish. Suitable tank mates include other brackish or marine fish of a similar size and temperament, such as Mono Fish, Scats, and Archer Fish. Avoid keeping them with smaller species that may be seen as food. Columbian Sharks can be kept in groups, which promotes natural schooling behavior, but ensure sufficient space and filtration.
5. Common Challenges and Tips
- Transitioning Salinity: As they mature, Columbian Sharks require an increase in salinity, which can be challenging for some aquarists. Plan for this change as they grow.
- Sensitive Barbels: These catfish have sensitive barbels that can be damaged on rough substrate or sharp decorations, so a soft substrate is recommended.
- Active Swimmers: Due to their activity level and size, they require ample space and efficient filtration to maintain water quality.
Conclusion
The Columbian Shark Catfish (Ariopsis seemanni) is a fascinating species that offers the look and movement of a shark in a fish tank setting. While their unique care needs, including brackish-to-marine salinity, make them suitable for experienced hobbyists, they reward their owners with stunning, active displays. With proper care, diet, and a suitable tank setup, this impressive species can become a showpiece in a large, well-maintained aquarium.
