Paracyprichromis

Genus Overview: Paracyprichromis (Cave Sardine Cichlids)

The genus Paracyprichromis comprises an exceptionally beautiful, peaceful, and behaviorally unique group of rock-associated pelagic cichlids endemic to Lake Tanganyika. Settled firmly within the specialized Cyprichromini tribe, these highly elongated, slender fish fill an elegant evolutionary niche, bridging the gap between open-water schooling sardines and the strict cave-dwelling rock huggers.

The Thigmotaxic Schooling & Tube Jaw Mechanics

The name Paracyprichromis translates from Greek to imply "alongside Cyprichromis," pointing to their heavy genetic and morphological links. Like their open-water cousins, they are obligate zooplanktonivores that feed primarily on microscopic copepods, tiny crustaceans, and drifting larvae. They possess highly protractile jaws that telescope forward into a suction tube, creating a vacuum to snatch individual plankton with absolute precision.

However, their navigational choices are what make them a masterpiece of adaptation. While standard *Cyprichromis* fly over open water in the blazing sun, *Paracyprichromis* exhibit a strong form of thigmotaxis, orienting their bodies entirely in relation to solid stone walls. In the wild, they form massive, tightly coordinated schools that hover inside deep, dark underwater caves and vertical rock fissures.

The entire school navigates in complete alignment with the rock contours—swimming perfectly parallel down steep cliff faces, horizontally along ledges, or cruising completely upside down under cave ceilings.

Valid Species Directory

Modern scientific records recognize two valid species within this specialized lineage, though geographic variations with unique fin colours add immense variety to the hobby:

• Paracyprichromis nigripinnis (Boulenger, 1901) – The absolute historical type species of the genus, globally celebrated as the Blue Neon Ahli of Tanganyika. Dominant mature males develop a soft, dark copper-lavender base body frame decorated with multiple rows of blazing, glittering neon electric-blue horizontal stripes that pulse intensely in dim cave environments. Famous variants include "Albino" and "Chitika."
• Paracyprichromis brieni (Poll, 1981) – Brien's Sardine Cichlid, displaying a slightly more slender vertical profile and unique golden-yellow to orange borders lining its high-crested dorsal and lyretail fins. Famous variants include "Velifer" and "Kigoma."

Aquarium Husbandry & Maternal Cave Mouthbrooding

Adult lengths typically reach a highly manageable 4 to 4.5 inches (10–11 cm). Because they are schooling fish that need a group structure to feel secure, they demand aquariums measuring at least 4 feet in length (55 to 75 gallons minimum) and must be maintained in groups of 8 or more individuals.

To satisfy their natural thigmotaxic behavior, provide an abundance of tall, large, flat pieces of slate, flagstone, or ceramic tiles built into vertical structures along the background, creating shaded vertical cracks and deep overhanging caves.

They are highly advanced **maternal mouthbrooders** that spawn right against vertical rock faces or cave walls. The female releases eggs into the open water column, tilts her body downward to catch them inside her mouth before they drop to the substrate, and nips at the male's anal fin to receive fertilization.

They are an exceptionally peaceful, docile, and mild-mannered genus that acts as a perfect dither fish. They must never be housed alongside rowdy or hyper-aggressive rock-dwellers like *Tropheus* or large *Lamprologus*, which will easily intimidate them and suppress their colours. In captivity, they eagerly accept premium commercial flakes, cyclops, daphnia, and frozen mysis shrimp.