Dicrossus gladicauda Breeding Guide

Breeding the sword-tail checkerboard cichlid Dicrossus gladicauda, a Colombian blackwater dwarf cichlid bred following genus biology in very soft, acidic water.

Overview

Dicrossus gladicauda is a checkerboard dwarf cichlid from the lower Río Atabapo drainage in Colombia (FishBase). FishBase records a maximum standard length of 4.2 cm, and the species name derives from Latin gladius (sword) and cauda (tail), referring to the sword-like streamer of the dorsal lobe of the caudal fin in adult males. No species-specific spawning account was found in the consulted whitelisted sources, so breeding is described following the biology of its congener Dicrossus filamentosus.

Sexing

FishBase notes the diagnostic male sword-shaped caudal extension. In the closely related D. filamentosus, males are slightly larger and develop an attractive elongated caudal fin, while females are smaller with rounded fins (Seriously Fish). Definitive species-specific dimorphism beyond the male caudal streamer is not detailed in the consulted sources.

Conditioning

For the genus, live foods are highly recommended to bring fish into breeding condition (Seriously Fish, for D. filamentosus). The KB record classifies D. gladicauda as a carnivore fed twice daily.

Breeding Setup

Dicrossus are demanding regarding water chemistry: in D. filamentosus, breeding succeeds only in premium soft, acidic conditions, with reverse-osmosis water nearly mandatory, hardness of 1 dGH or lower, and temperatures of 27-30 °C (Seriously Fish). The KB record for D. gladicauda lists a minimum volume of 80 L with temperatures of 25-29 °C, pH 4-6 and GH 1-3.

Spawning Behavior & Trigger

Genus members spawn on solid surfaces, and live foods are used as a conditioning trigger (Seriously Fish, for D. filamentosus). A species-specific spawning sequence for D. gladicauda was not documented in the consulted sources.

Egg & Fry Care

Across Dicrossus, eggs will not hatch above roughly pH 5.8, so eggs require very soft, acidic water to develop (Seriously Fish, for D. filamentosus). Detailed clutch size and fry-rearing data specific to D. gladicauda are not available in the consulted sources.

Common Challenges

The KB record rates breeding difficulty as advanced. The principal challenge is achieving and stabilising the very soft, acidic water the genus requires for eggs to develop, as documented for its congener (Seriously Fish).