Borneo Redfin Silver Shark: Cyclocheilichthys janthochir

Borneo Redfin Silver Shark

The Borneo Redfin Silver Shark, scientifically known as Cyclocheilichthys janthochir, is a captivating freshwater fish native to Southeast Asia, particularly the regions surrounding the island of Borneo. This species is recognized for its stunning aesthetic appeal, featuring a sleek, elongated body with shimmering silver scales that reflect the light beautifully. One of the most striking features is its vivid red-orange fins, which stand in stark contrast to its silver body, giving it a unique and visually arresting appearance. This combination of colors makes the Borneo Redfin Silver Shark a popular choice among aquarists seeking to add a spectacular showpiece to their tanks, elevating the overall visual experience of their aquatic environments.

In addition to its visual charm, the Borneo Redfin Silver Shark holds significant importance in the aquarium hobby due to its peaceful nature and adaptability. As a schooling fish, it thrives in environments where it can swim in groups, providing both a dynamic display and a more naturalistic setting. The fish is also known for its ability to adapt to various tank conditions, making it a suitable choice for both novice and experienced aquarists alike. Its presence not only enhances the aesthetic appeal of the aquarium but also contributes to the healthy social dynamics within community tanks.

Natural Habitat & Origin

The Borneo Redfin Silver Shark is endemic to the rivers and streams of Borneo, particularly within Malaysia and Indonesia. This species primarily inhabits freshwater environments that range from slow-moving streams to the calm shallows of rivers, where it finds refuge amidst submerged structures and vegetation. Typically, these waters are characterized by a tropical climate, with a warm temperature range and mild flow. The natural habitats often exhibit blackwater conditions, which are rich in tannins and organic matter, resulting in low pH levels and darkly stained water.

These fish prefer heavily vegetated areas, where they can hide and forage for food. The surrounding environment is usually filled with soft substrate and a variety of aquatic plants, providing both shelter and a natural source of grazing. The interplay of light and shadow in these environments contributes to their striking coloration and behavior, allowing them to thrive and display their natural beauty.

Care Requirements

To maintain the Borneo Redfin Silver Shark's health and well-being, specific care requirements must be met. The ideal water parameters for these fish include a pH range of 6.0 to 7.5, a temperature between 24°C and 28°C (75°F to 82°F), and moderate water hardness of 4 to 15 dGH. Regular water changes and filtration are essential to ensure a clean aquatic environment, which helps prevent stress and disease.

When setting up the tank, a minimum size of 200 liters (approximately 53 gallons) is recommended to accommodate their active nature and schooling behavior. The substrate should be soft and sandy, allowing for ease of movement and natural foraging. Incorporating plenty of plants, both floating and rooted, will replicate their natural habitat and provide essential hiding spots. Lighting should be moderate, as overly bright conditions may stress the fish, and the use of floating plants can help create shaded areas within the tank.

Diet & Feeding

The Borneo Redfin Silver Shark is an omnivorous species with a diverse diet that can include a variety of food types. In captivity, providing a mix of high-quality flakes, pellets, and live or frozen foods will ensure they receive all essential nutrients. Foods such as brine shrimp, bloodworms, and daphnia are excellent additions to their diet, offering both protein and variety. In addition, supplementing with vegetable-based foods, like spirulina flakes, is beneficial to support their natural herbivorous tendencies.

Feeding should occur 2-3 times a day, with amounts they can consume within a few minutes to prevent overfeeding and maintain water quality. Observing their feeding behavior can also be helpful in determining their preferences and ensuring they are receiving adequate nutrition.

Behavior & Temperament

The Borneo Redfin Silver Shark is known for its peaceful and sociable behavior, making it a great addition to community tanks. These fish are highly social and should be kept in groups of at least five to six individuals to exhibit their natural schooling behavior effectively. This schooling tendency not only enhances their confidence in the aquarium but also brings out their more vibrant colors and active nature.

In terms of tank placement, the Borneo Redfin Silver Shark tends to occupy the upper and middle levels of the tank, swimming gracefully through the water. While generally docile, they may exhibit occasional territorial behavior, especially during feeding or if they feel crowded. It's important to provide ample swimming space and hiding spots to mitigate any potential stress or aggressive interactions.

Tank Mates

The compatibility of the Borneo Redfin Silver Shark with other species greatly depends on their temperament and social nature. Ideal tank mates include peaceful fish such as tetras, rasboras, barbs, and smaller cichlids, as these species are more likely to coexist harmoniously. They can also tolerate other species that prefer similar water conditions, provided those fish are not overly aggressive.

However, it is essential to avoid keeping them with larger, aggressive species like cichlids or characins that could intimidate or harm them. Additionally, very small fish should also be avoided, as they may be seen as food, leading to potential predation. A well-thought-out community tank with appropriate species will create a balanced ecosystem and highlight the beauty of the Borneo Redfin Silver Shark.

Breeding

Breeding the Borneo Redfin Silver Shark in captivity can be challenging as it requires specific conditions to encourage spawning. These fish are known to be egg scatterers, typically spawning in soft, acidic waters. For successful breeding, the water should be maintained at a pH of 6.0-6.5, a temperature of approximately 26°C (79°F), and a hardness of around 4-8 dGH.

Setting up a separate breeding tank with plenty of fine-leaved plants or spawning mops can help facilitate the process, as the female will lay eggs among the foliage. After spawning, it is advisable to remove the adults from the spawning tank to prevent them from eating the eggs. The eggs will typically hatch within 24-48 hours, and fry should be fed infusoria or finely crushed flakes until they are large enough to consume small pellets.

Common Health Issues

The Borneo Redfin Silver Shark can be prone to several common health issues, including ich (Ichthyophthirius multifiliis), fin rot, and various parasitic infections. Maintaining optimal water quality and regular aquarium maintenance are the best preventative measures against these health problems. It is crucial to monitor their health closely and act quickly if signs of illness appear.

Ich typically presents as white cysts on the skin and fins, while fin rot appears as frayed or disintegrating fins. Immediate isolation and treatment of infected fish are important to prevent the spread of disease. Other preventive measures include keeping the tank stress-free, ensuring a balanced diet, and maintaining appropriate water conditions, which will help keep the Borneo Redfin Silver Shark healthy and vibrant in your aquarium.