Yellow Tetra / Dawn Tetra (Hyphessobrycon eos) Breeding Guide

Captive breeding of Hyphessobrycon eos is undocumented; this guide records its FishBase taxonomy and the Hyphessobrycon egg-scattering pattern.

Overview

Hyphessobrycon eos Durbin, 1909, the dawn tetra, is a freshwater, benthopelagic characid recorded by FishBase from South America (Guyana, listed as questionable) and reaching 4.2 cm total length. FishBase provides no reproduction details for the species, and no whitelisted source documents a captive spawning. This guide therefore reports the verified taxonomy and the general egg-scattering pattern of the genus.

Sexing

No species-specific sexing characters are recorded in the consulted sources. Across the genus Hyphessobrycon, mature females are generally rounder and fuller-bodied than the slimmer males when carrying eggs.

Conditioning

FishBase classifies the species as freshwater, benthopelagic and tropical. In the absence of species data, the genus approach is to condition a maintained group on small live and frozen foods until females visibly fill with eggs.

Breeding Setup

Following the Hyphessobrycon pattern, a small dimly lit spawning tank with fine-leaved plants or a spawning mop, or a mesh base that keeps eggs away from the adults, suits egg-scattering tetras, with gentle air-driven sponge filtration. Species-specific spawning parameters for H. eos are not on record.

Egg & Fry Care

In the genus, the eggs and early fry are light-sensitive, adults give no parental care and eat their own spawn, eggs hatch within roughly 24-36 hours, and fry become free-swimming after a few days, starting on infusoria-grade food before brine shrimp nauplii. No egg count or timing is confirmed for H. eos itself.