Breeding Lamprologus callipterus

Breeding guide for Lamprologus callipterus: large males collect snail shells into nests where tiny females breed, with one of nature's largest sex size differences.

Overview

Lamprologus callipterus is an unusual Tanganyikan cichlid endemic to Lake Tanganyika in which large males collect snail shells into nests and tiny females breed inside them. It is a polygamous shell brooder showing one of the largest weight differences between the sexes in the animal world, with males weighing over twenty times more than females.

Sexing

Sexual size dimorphism is extreme and unmistakable: males reach about 15 cm while females max out at around 6 cm. A male must be at least about 9 cm long to carry the snail shells he uses to build a nest, so breeding males are always the large individuals.

Conditioning

The species accepts most foods offered but requires live and frozen varieties as staples to come into condition. Maintain hard, alkaline water at 24-27 °C. During broodcare, males stop eating and weaken, so they should be well-conditioned beforehand.

Breeding Setup

Provide sand and a large supply of empty snail shells. A dominant male excavates a shallow pit and collects shells to create a spawning nest, commanding harems of many females in nature. Because males are territorial and aggressive toward each other, plenty of room is essential if more than one is kept.

Spawning Behavior & Trigger

Females lay eggs inside the shells, and the male fertilises them at the entrance since he is far too large to enter. Dwarf males small enough to enter the shells attempt to fertilise eggs, and sub-dominant males may sneak into a dominant male's territory to spawn clandestinely. A well-built shell nest and conditioned fish trigger spawning.

Egg & Fry Care

Females incubate the eggs within the shell for around ten to seventeen days without feeding while the male guards the territory. Once the fry become free-swimming, no further broodcare is given by either parent; the fry can be raised on microworm and brine shrimp nauplii.

Common Challenges

Male aggression and the need for large numbers of correctly sized shells make this a specialty project. The extreme size difference means very small females must be protected, and the energetic demands of shell-carrying and guarding mean males must be in excellent condition before breeding.