Iridescent sharks, also known as Pangasius catfish or Sutchi catfish, are generally considered relatively easy to keep compared to some other fish species. They are robust and not particularly prone to disease. However, they have a low tolerance for cold water, and water temperature is a critical factor for their well-being. They are also known to be quite aggressive and can grow to be very large, which often makes them unsuitable for community tanks with other fish.
Key Considerations for Keeping Iridescent Sharks
1. Iridescent sharks are large ornamental fish. When kept in home aquariums, they typically reach lengths of about half a meter to one meter. In the wild, they can grow up to 3 meters long. They are active swimmers, primarily inhabiting mid-to-lower water levels. Due to their aggressive nature, they are not recommended for cohabitation with other fish species. This aggressive behavior and their rapid growth can make them challenging to manage in a standard home aquarium. They are a truly aggressive fish, meaning they will eat smaller tank mates.
2. These sharks aren't particularly demanding when it comes to environmental conditions. They exhibit excellent tolerance to low oxygen levels and adaptability to varying environments. However, their sensitivity to low temperatures is quite pronounced. Water temperature is vital to their survival. The ideal water temperature range for iridescent sharks is 22-28 degrees Celsius. When water temperatures drop to 18 degrees Celsius, they become lethargic. A drop to 12 degrees Celsius can be fatal. They can tolerate pH levels between 5.0 and 7.5.
3. Successfully keeping an iridescent shark isn't always straightforward. They are omnivores and will consume a variety of foods, including small fish and plankton. They also consume aquatic plants and prepared feeds. Given their rapid growth and large appetite, it’s essential to provide a diet rich in nutrients, with protein making up 28%-32% of their total intake. Iridescent shark fry grow very quickly. They can reach 0.6 kg within approximately four months. However, they are not known to reach maturity at a fast pace. They generally reach sexual maturity after 3-4 years, when they typically weigh over 3 kilograms. Adequate space, a high-quality filtration system, and meticulous attention to water parameters are crucial for their well-being and healthy growth.
In summary, iridescent sharks are relatively easy to maintain and are considered hardy, making them an appealing choice for experienced aquarists who appreciate large, unique fish. However, their size, aggressive nature and specific temperature needs require serious consideration before choosing to keep them. Their need for a large tank to accommodate their fast growth is paramount. Potential owners should be prepared to meet their requirements to ensure their health and well-being.