Genicanthus watanabei

Datasheet

General Description

The Genicanthus watanabei, also known as the Blackedged angelfish, belongs to the Pomacanthidae family. These angelfish are distinguished by their lyre-like tail and their feeding habits which include zooplankton, microalgae, fish eggs, and small invertebrates. They are particularly well-suited for coral aquariums as they rarely feed on corals, with a few exceptions. The species is known for its gender dimorphism, where females can change into males, and the interaction between sexes is generally harmonious.

Aquarium Suitability

This species is suitable for aquariums but requires careful attention due to their delicate hardiness. They function best as a pair or with one male and multiple females in an aquarium of at least 500 liters. Feeding several times a day is necessary, especially upon introduction, and providing varied diet options is essential. Good hiding places and dimmed lighting at first are also important for acclimatization. The Genicanthus watanabei thrives in spacious tanks with ample swimming space and a well-established environment with algae-rich surfaces.

Care and Hardiness

Considered delicate in terms of hardiness, these angelfish require frequent feeding, varied diet, sufficient hiding spots, and dimmed lighting during acclimatization. They are known to be grazers and need well-established aquariums with algae-rich surfaces for optimal health. The species can become stressed if not provided with high water quality and proper nutrition.

Reef Suitability

Reef compatibility with caution is advised for the Blackedged angelfish. While they are generally considered safe for reefs, some individuals may pose risks, especially towards soft corals and LPS. Selecting suitable corals and closely monitoring their behavior is essential for a successful reef setup.

Aquarium Setup

When setting up an aquarium for the Genicanthus watanabei, it is vital to provide good hiding places using live rocks. The tank should have dimmable lighting to help with acclimatization, and a varied diet that includes zooplankton, microalgae, fish eggs, and small crustaceans is recommended. Creating a well-established environment with algae-rich surfaces and ensuring sufficient space for swimming are crucial for their well-being.

Behaviour

The Blackedged angelfish may exhibit aggression towards similar species, particularly males towards each other. However, females can coexist peacefully with individuals of other species. They are known to swim actively and should be provided with enough space in the aquarium to express their natural swimming behaviors.

Feeding and Diet

The recommended diet for Genicanthus watanabei includes larger crustaceans, microalgae like spirulina, and small crustaceans such as krill, mysis, and artemia. It is important to feed this species several times a day, especially during acclimatization, and ensure a varied diet to meet their nutritional needs.

Dimorphism

This species of angelfish exhibits gender dimorphism where females have the ability to change into males. This change typically occurs when a dominant male is needed within the group dynamic. Understanding this unique aspect of their biology is important for maintaining a balanced aquarium environment.

Habitat and Distribution

Genicanthus watanabei is found in the Pacific Ocean, ranging from Taiwan to the Tuamoto Islands, north to the Ryukyu Islands, and south to New Caledonia and the Austral Islands. They prefer deep waters and are commonly located in areas with abundant zooplankton for feeding.