Common name: Blackedged Angelfish

General Information

Blackedged Angelfish, scientifically known as Genicanthus watanabei, is a striking and elegant species that has captivated marine aquarists with its unique beauty and peaceful demeanor. This species is named after the Japanese ichthyologist Dr. Masao Watanabe, who contributed significantly to the study of marine life. Known for its distinct sexual dimorphism, the males exhibit a vibrant blue body with black-edged fins, while females are adorned with a more subdued blue and yellow coloration.

In the aquarium trade, Blackedged Angelfish is highly regarded not only for its aesthetic appeal but also for its reef-safe nature, making it a popular choice among hobbyists looking to add a splash of color without compromising their coral inhabitants.

Care

Blackedged Angelfish is considered moderately easy to care for, provided their specific needs are met. They thrive in well-maintained reef aquariums with plenty of swimming space and live rock for grazing. These angelfish prefer stable water conditions and benefit from a diet rich in marine algae and high-quality angelfish preparations.

A minimum tank size of 300 liters is recommended to accommodate their active swimming habits. These fish appreciate a well-structured environment with ample hiding spots and open areas to explore.

Diet and Feeding

In the wild, Blackedged Angelfish primarily feed on zooplankton and algae. In captivity, they should be offered a varied diet that includes high-quality flake and pellet foods, along with frozen or live foods such as brine shrimp and mysis shrimp. Regular feedings help maintain their vibrant coloration and overall health.

Feed them small portions several times a day to mimic their natural grazing behavior and ensure they receive adequate nutrition.

Behavior and Compatibility

Blackedged Angelfish are known for their peaceful temperament, making them excellent candidates for community reef tanks. They are generally non-aggressive towards other fish and can coexist with a variety of tank mates, including other peaceful angelfish species.

These angelfish exhibit interesting social behaviors, often forming small harems in the wild. In captivity, they can be kept singly or in pairs, but if a harem is desired, ensure the tank is large enough to accommodate multiple individuals.

Reproduction

Blackedged Angelfish are protogynous hermaphrodites, meaning they are born female and can change to male if needed. Breeding in captivity is rare, but when it occurs, the male will display vibrant colors and perform courtship displays to attract females. The eggs are pelagic and require specific conditions for successful hatching and rearing.

Health and Common Issues

Blackedged Angelfish are generally hardy, but they can be susceptible to common marine diseases such as ich and marine velvet. Maintaining optimal water quality and a balanced diet is crucial for preventing health issues. Regular observation and prompt treatment of any signs of illness are essential for their well-being.

When selecting a Blackedged Angelfish, look for individuals with clear eyes, vibrant colors, and active swimming behavior. Avoid fish that appear lethargic or have visible signs of disease.

Habitat

Blackedged Angelfish are native to the Pacific Ocean, particularly around the Indo-Pacific region, including areas such as the Philippines, Indonesia, and the Great Barrier Reef. They inhabit deep reef slopes and outer reef areas, often found at depths ranging from 20 to 60 meters.

These angelfish prefer environments with plenty of open water for swimming, as well as rocky crevices and coral formations for shelter.