Cryptoheros spilurus Breeding Guide

Breeding the blue-eye cichlid Cryptoheros spilurus, a biparental substrate spawner producing 200-500 eggs that hatch in roughly 52-54 hours.

Overview

Cryptoheros spilurus, the blue-eye cichlid, is a Central American convict relative. It is a biparental substrate brooder whose early development has been documented in a peer-reviewed study, providing precise data on egg size, hatching and larval growth. The same study confirmed biparental care, with parents protecting the larvae during the early stages.

Breeding Setup

• Provide rocky surfaces or a cave-like spot; eggs are deposited on rocky substrate, and clay pots are readily used.
• Use sand substrate so the pair can dig pits near the spawning site.
• Maintain a temperature around 28 C, as used in the documented rearing study.
• A tank of roughly 150 L suits a pair.

Spawning Behavior & Trigger

The pair selects a spawning site at a cave and digs small pits near the entrance, with the female cleaning the site while the male patrols. The female makes a series of dry runs and then deposits her eggs, which the male fertilises immediately. Females spawned at regular intervals of 15 to 18 days, producing clutches of 200 to 500 eggs measuring 1.65 plus or minus 0.05 mm in diameter.

Egg & Fry Care

After spawning the female hovers above the eggs and fans them with her pectoral fins. Hatching is asynchronous, occurring at about 52 to 54 hours post-fertilisation, with most embryos emerging by 52 hours and some as late as 54 hours. Hatchlings measure roughly 4.7 mm total length, with large yolk sacs and underdeveloped eyes. By 16 days post-hatch the fish reach about 13.2 mm total length and complete metamorphosis. In the documented study the parents transferred egg-bearing rocks or clay pots to a separate tank, demonstrating how a clutch can be moved for controlled rearing.

Common Challenges

As a convict relative, breeding pairs become territorial; provide structure and avoid housing with timid or much smaller tankmates. Asynchronous hatching means wrigglers emerge over a couple of days, which is normal.