Common name: Blue-striped Angelfish

General Information

The Blue-striped Angelfish, scientifically known as Chaetodontoplus septentrionalis, is a striking marine fish admired for its vibrant coloration and unique patterns. This species is native to the western Pacific Ocean, particularly around Japan, Taiwan, and the South China Sea. Known for its bold blue and yellow stripes, the Blue-striped Angelfish is a captivating addition to any marine aquarium, although it is less commonly seen in the pet trade compared to other angelfish species.

In the aquarium hobby, the Blue-striped Angelfish is appreciated for its beauty and relatively peaceful demeanor. However, it is considered a more challenging species to keep due to its specific dietary needs and sensitivity to water conditions. This makes it more suitable for experienced aquarists who can provide the necessary care and environment.

Care

Caring for the Blue-striped Angelfish requires attention to detail, especially regarding water quality and diet. They thrive in large, well-established aquariums with plenty of live rock for grazing and hiding. A tank size of at least 500 liters is recommended to accommodate their active swimming habits and territorial nature.

Maintaining stable water parameters is crucial. The aquarium should have efficient filtration and regular water changes to keep nitrate levels low, as this species is sensitive to poor water quality.

Diet and Feeding

The Blue-striped Angelfish is an omnivore with a diet that includes sponges, tunicates, and algae in the wild. In captivity, they should be offered a varied diet consisting of high-quality angelfish preparations, including frozen or live foods such as mysis shrimp, brine shrimp, and marine algae. Supplementing their diet with sponge-based foods is essential to meet their nutritional needs.

Feeding should occur multiple times a day in small portions to mimic their natural grazing behavior. Ensuring a balanced diet will help maintain their vibrant colors and overall health.

Behavior and Compatibility

Blue-striped Angelfish are generally peaceful but can be territorial, especially towards other angelfish. They are best kept singly or as a mated pair in a large tank. They can coexist with other peaceful species, but caution is advised when introducing them to a community tank.

These angelfish are not reef-safe, as they may nip at coral polyps and sessile invertebrates. Therefore, they are better suited for fish-only or carefully planned mixed-species aquariums.

Reproduction

Breeding Blue-striped Angelfish in captivity is rare and challenging. They are oviparous, with external fertilization occurring in the water column. Successful breeding requires precise control of water conditions and a spacious environment to encourage natural behaviors.

Health and Common Issues

Blue-striped Angelfish are susceptible to common marine diseases such as ich and marine velvet. Quarantining new additions and maintaining optimal water quality are essential preventive measures. Regular observation for signs of stress or illness, such as changes in color or behavior, can help catch potential issues early.

Habitat

In the wild, the Blue-striped Angelfish inhabits coral-rich areas and rocky reefs at depths of 5 to 30 meters. They prefer environments with abundant hiding spots and grazing opportunities, which should be replicated in captivity to ensure their well-being.