Cheilodipterus quinquelineatus Breeding Guide

Cheilodipterus quinquelineatus is a striped Indo-Pacific cardinalfish with a partly piscivorous diet that broods eggs in the male's mouth. This guide covers pairing, conditioning and the paternal mouthbrooding cycle.

Overview

Cheilodipterus quinquelineatus is a cardinalfish reaching about 13 cm, widespread through the tropical Indo-Pacific from the Red Sea to the Pitcairn Group, at depths from the surface to about 40 m (FishBase). It is nocturnal and occurs singly or in small to large aggregations, sheltering in dark crevices, branched coral, under ledges and among sea-urchin spines, and is generally common.

Sexing

External sexing is not documented for the species; as in other cardinalfish the male is recognised by the larger head and jaw once he is incubating eggs. Because the fish can be kept singly or in groups, growing several together and watching for stable pair formation is the practical route to a breeding pair.

Conditioning

This species is more predatory than many cardinalfish, feeding on small crustaceans, gastropods and small fish (FishBase). Conditioning therefore uses larger meaty items such as enriched mysis, marine crustaceans and chopped seafood, offered in the evening to match its nocturnal hunting; tankmates small enough to be eaten should be avoided.

Breeding Setup

A breeding setup provides dark crevices, branched coral and ledges so a pair can shelter by day and court at night, with subdued lighting and calm to moderate flow. Given the species' size and partly piscivorous diet, a dedicated tank with no small fish lets a pair settle and makes a brooding male easy to follow.

Spawning Behavior & Trigger

The species are mouthbrooders showing distinct pairing during courtship and spawning (FishBase). The female transfers an egg mass to the male, who fertilises and orally incubates it; species-specific clutch counts and exact triggers are not given in the cited source and are therefore omitted, with stable conditions favouring repeated spawns.

Egg & Fry Care

The male incubates the egg mass in his mouth and does not feed during this period, as is typical of the family. Released larvae are pelagic and need a separate rearing tank with very small first foods; the cited source confirms mouthbrooding but provides no species-level larval rearing detail.

Common Challenges

The partly piscivorous diet complicates community breeding, since small tankmates and undersized fry of other species are at risk. As with other cardinalfish, the small pelagic larvae and their narrow first-feeding window are the main obstacle, and the fasting brooding male must be left undisturbed.