Labidochromis joanjohnsonae, commonly known as the Exasperatus or Pearl of Likoma, is a captivating species of cichlid native to the rocky shores of Lake Malawi in Africa. This species is part of the Mbuna group, a term in the local Tonga language that means "rockfish," referring to the habitat where these cichlids predominantly reside. The Exasperatus is particularly noted for its striking appearance and relatively peaceful demeanor compared to other Mbuna species, making it a sought-after addition to African cichlid aquariums.

The Exasperatus showcases a beautiful contrast of colors, with males displaying a vibrant blue body accented with striking black bars, while females tend to be more subdued in coloration, typically exhibiting a silvery or lighter blue hue with less pronounced barring. This dimorphism not only adds visual interest to the aquarium but also makes it easier for aquarists to distinguish between males and females. The species reaches a manageable size, allowing for its inclusion in a variety of tank setups, provided their specific care needs are met.

Creating an optimal environment for Labidochromis joanjohnsonae involves replicating the rocky landscapes and water conditions of Lake Malawi. This includes setting up an aquarium with abundant rockwork that forms caves, crevices, and tunnels, providing essential hiding spots and territories for these cichlids. A sandy substrate can complement the rocky setup, mimicking the lake's bottom. The water in the aquarium should be well-oxygenated and maintain conditions that mirror the alkaline waters of their natural habitat, including maintaining high water quality and stable temperature.

The diet of the Exasperatus is omnivorous, with a preference for algae and small invertebrates in the wild. In captivity, they should be provided with a balanced diet that includes high-quality cichlid pellets or flakes, supplemented with spirulina, vegetables such as zucchini or cucumber, and occasional live or frozen foods. It's important to monitor their intake of protein-rich foods to prevent digestive issues, as their natural diet is predominantly plant-based, with occasional invertebrates.

Breeding Labidochromis joanjohnsonae can be a fascinating process, as they exhibit maternal mouthbrooding behavior. After spawning, the female collects and carries the fertilized eggs in her mouth until they hatch, providing protection for the developing fry. This breeding behavior is typical of many African cichlids and adds an intriguing aspect to their care.

Caring for the Exasperatus involves regular maintenance routines to ensure the water quality remains high, with frequent water changes and effective filtration. While they are generally peaceful towards other species, their own territorial behavior should be considered when selecting tank mates. It's advisable to keep them with other fish that can tolerate the occasional bouts of aggression typical of cichlids, especially during breeding.

In summary, Labidochromis joanjohnsonae, or the Exasperatus, offers aquarists the opportunity to keep a small, peaceful, and strikingly beautiful species from Lake Malawi. While their care requires attention to their dietary, environmental, and social needs, the rewards include the enrichment of the aquarium with their vibrant appearance, intriguing behaviors, and the challenge of maintaining a slice of African cichlid diversity in the home aquarium.