Reganochromis

Genus Overview: Reganochromis

The genus Reganochromis represents an exceptionally graceful, evolutionarily distinct, and gentle lineage of deep-water cichlids endemic to Lake Tanganyika. It is a monotypic genus containing only a single, highly prized valid species: Reganochromis calliurus. Primarily tracking the deep, low-light sedimented boundaries where sandy plains flatten out into soft mud beds, this rare fish is a true masterpiece of specialized benthic evolution.

Pencil Morphology & Substrate Precision Picking

The genus Reganochromis was established to honour the monumental taxonomic contributions of British ichthyologist Charles Tate Regan, while the species name calliurus translates from Greek to mean "beautiful tail." Biologically, they are specialized micro-predators and invertebrate pickers. They possess a highly elongated, slender, and slightly compressed vertical profile paired with a long, downward-sloping snout frame.

In their natural wild biotope, they operate across deep, calm layers of the lake—frequently documented at depths between 30 and over 60 metres. Unlike aggressive sand-sifters that roughly dive headfirst into the substrate, Reganochromis calliurus behaves as a precision stalker. The fish hovers motionless just millimeters above the loose silt, using its large, light-sensitive eyes to locate movement before launching a swift, targeted lunge to pluck tiny insect nymphs, small freshwater shrimp, and micro-crustaceans directly off the mud floor.

Species & Color Profile

There is only one recognized species within this specialized benthic lineage:

• Reganochromis calliurus (Boulenger, 1901) – The Beautiful-Tail Pencil Cichlid.

Females and sub-dominant juveniles carry a highly reflective, flawless silvery-white iridescent base to blend with moving light currents in the dim depths. When a dominant male prepares to spawn, he develops an exceptionally elegant palette—his body transforms into a shimmering coat of uniform metallic silver-gray and pastel violet iridescence, highlighted by bold, contrasting black and white horizontal bands trimming his high-crested dorsal fin, and a spectacular, pattern-filled lyretail fin.

Aquarium Husbandry & Bi-Parental Mouthbrooding

Adults achieve a highly manageable maximum length of roughly 5 to 5.5 inches (13–14 cm). Because they are active swimmers that need ample horizontal room to feel secure, they demand aquariums measuring at least 4 feet in length (55 to 75 gallons minimum). To safely accommodate their natural foraging behaviours and protect their long snout structures, a pristine layer of very fine, smooth, soft sand substrate is an absolute prerequisite; coarse gravel will cause severe irritation to their mouth linings.

Reprodutively, they display an incredibly advanced, fascinating strategy known as **monogamous bi-parental mouthbrooding**. A bonded pair will work together to excavate a deep spawning pit in the sand, often underneath a flat shelter stone. They spawn directly on the substrate. The female immediately scoops up the eggs, mouthbrooding them for the first phase of development.

In a beautiful show of family cooperation, she then opens her jaws and transfers the larvae directly over to the male cichlid, who mouthbroods them inside his own jaw until they are ready to be released as fully formed fry. They are exceptionally peaceful, docile, and mild-mannered fish that completely lack territorial malice toward other species. They must never be housed alongside rowdy rock Mbuna or dominant *Tropheus*, which will easily bully them. In captivity, they eagerly accept premium commercial flakes, micro-pellets, and frozen mysis or cyclops.