Genicanthus

Genicanthus is a genus of marine angelfish in the family Pomacanthidae. The genus comprises several species native to the tropical Indo-Pacific, from the Red Sea and Indian Ocean to the central Pacific, where they inhabit coral reefs, reef slopes, and protected lagoons. Members of Genicanthus are typically slender and laterally compressed, with coloration and patterns that vary widely among species. Many species exhibit sexual dimorphism, with males often more vividly colored than females, and some have distinctive tail shapes, such as lyre-like caudal fins.

Ecology and behavior: Genicanthus individuals are commonly observed in pairs, sometimes within small groups, and they are generally territorial on their reef home. They feed as omnivores, taking algae, zooplankton, small invertebrates, and biofilm. In aquariums they often accept prepared foods but require a varied diet to maintain health and coloration.

Reproduction: Genicanthus species form monogamous pairs that spawn openly over the reef. They are typically considered protogynous hermaphrodites—females can change sex to become breeding males if the situation requires.

In aquarium keeping: Several Genicanthus species are prized for their beauty and comparatively peaceful behavior, but they can be challenging due to their size, specific dietary needs, and territoriality. They require large, well-filtered tanks with stable water parameters and plenty of hiding places. Some species are considered more reef-safe than other angelfishes, though all Genicanthus may nip sessile invertebrates or coral polyps under certain conditions. Overall, successful care emphasizes space, diet variety, and stable reef-compatible conditions.