Dawn Tetra
Hyphessobrycon eos
Incredible bright yellow-gold shade ('eos' means dawn), with a conspicuous and unique large dark round patch located in the middle of the caudal peduncle and white edge on the anal fin.
Température de l’eau
24 - 28 °C
Valeur du pH
5.5 - 7
Type d'eau
Eau douce
Niveau dans le bac
Milieu
Taille adulte
4,5 cm
Volume minimal du bac
>= 80 L
Groupe minimal
>= 6
GH
1 - 10 dGH
KH
1 - 6 dKH
TDS
25 - 210 ppm
Conductivité
39 - 328 uS/cm
Description de l'espèce
Geographical Origin and Habitat: Originating from the Essequibo River basin and rivers of Guyana (South America). Found in slow forest streams and brooks (both black and clear waters), among dense accumulations of organic matter and submerged foliage.
Taxonomy and Morphology: Dawn Tetra (Hyphessobrycon eos). The scientific name "eos", meaning dawn in Greek, alludes to its warm reflective colors. Has a moderately stocky and tall shape, typical of the Hyphessobrycon genus.
Social Behavior: Very peaceful and sociable, to be strictly kept in schools of a minimum of 8-10 individuals. Within the group, males establish peaceful hierarchical skirmishes by fully spreading their fins to intimidate each other.
Coloration and Sexual Dimorphism: "Dawn colored" livery: brilliant golden-yellow or orange base, with coppery hues under appropriate lighting, especially near the base of the tail. Adult males are noticeably more colorful and slender than females (larger and swollen).
Soins, reproduction et cohabitation
Aquarium Setup: 60 cm (24 inches) tank. It will display the best colors in a "blackwater" style aquarium with abundant catappa leaves, alder cones, intricate wood, and dim light (shielded by floating plants).
Diet and Feeding: Generalist omnivore and micro-predator. Very easy to feed: accepts high-quality crushed flake or micro-pellet foods. Provide live or frozen food (brine shrimp, daphnia, bloodworms) multiple times a week.
Water Quality: Not particularly demanding like other wild species, but appreciates soft (GH 1-10) and weakly acidic to neutral waters (pH 5.5-7.0). Sensitive to excess nitrogen and nitrates (perform regular water changes).
Compatibility and Cohabitation: A perfect companion for almost all peaceful South American community fish. Ideal with Nannostomus, Carnegiella, Corydoras, Ancistrus, and Dwarf Cichlids (Apistogramma, Mikrogeophagus).
Aquarium Breeding: Free egg scatterer. Under conditions of soft water and rich feeding, they spawn among plants (Java Moss). Essential to remove parents after spawning to protect the hundreds of eggs produced.
Risks and Diseases: Vulnerable to wasting in recently setup (un-cycled) aquariums and easily stressed in bare environments, completely losing its typical golden hue ("stress coloration").
Origine et répartition géographiques
Originating from the Essequibo River basin and rivers of Guyana (South America). Found in slow forest streams and brooks (both black and clear waters), among dense accumulations of organic matter and submerged foliage.
Origine
Océans tropicaux et récifsAmazonie, Orénoque et Guyanes
Profil de poisson
- Tempérament
- Semi-aggressive
- This is a highly peaceful and somewhat shy species that thrives in a calm environment. They are a schooling fish that relies on the presence of conspecifics to feel safe and exhibit their best behavior. When kept in sufficiently large groups, they are active and inquisitive without ever bothering tank mates.
- Régime alimentaire
- Omnivore
- This species is an opportunistic omnivore that will easily accept a wide variety of aquarium foods. A staple diet of high-quality flakes or pellets should be provided daily. For optimal health and coloration, supplement with frozen or live foods such as bloodworms and brine shrimp.
- Espérance de vie
- 2-5 years
- Taille adulte
- 4.5 cm
- Ratio des sexes
- School
- Maintaining a proper sex ratio is less critical for this species compared to some others, as they are a schooling fish. Keeping them in groups of at least eight to ten individuals ensures natural behavior and reduces stress. Having a mix of males and females can help diffuse any minor squabbles among displaying males.
- Fréquence d'alimentation
- Twice daily
- These active fish benefit from multiple small feedings throughout the day rather than one large meal. Feeding them two to three times daily with amounts they can consume in under two minutes is ideal. This schedule helps prevent bloating and keeps water parameters stable by reducing uneaten food.
- Charge biologique
- Low
- This species produces a very minimal bioload due to its small physical size. It is highly suitable for smaller aquariums or heavily planted setups. However, standard filtration and regular water changes remain essential.
- Courant
- Stagnant
- Originating from slow-moving tributaries and forested pools, they prefer gentle to moderate water currents. High flow environments can quickly exhaust these fish and cause them significant stress. A sponge filter or a baffled hang-on-back filter provides the perfect amount of water movement.
- Risque de saut
- No
- Reproduction
- Oviparous
- They are egg scatterers that do not provide any parental care to their offspring after spawning. To encourage breeding, a separate tank with soft, slightly acidic water and fine-leaved plants is required. Once eggs are laid and fertilized, the adult fish must be removed promptly to prevent them from eating the eggs.
- Compatibilité et compagnons
- Peaceful
- This species is exceptionally peaceful and does well in community tanks with other small, non-aggressive fish. They should never be kept with large or boisterous species that might view them as food. Ideal tank mates include small rasboras, Corydoras catfish, and peaceful dwarf cichlids.
- Niveau dans le bac
- Middle
- This species primarily occupies the middle region of the aquarium water column during normal activities. They are active swimmers that appreciate ample open swimming space in the center of the tank. They will frequently dart in and out of plant thickets or hardscape for cover when resting.
Modèles et paramètres scientifiques
FishBase
Fenêtre sur les données scientifiques officielles de l’espèce
FishBase v25.04Données synchronisées le : 15/06/2026
- Niveau trophique
- 2,9 ± 0,3 se
- Résilience
- Élevée (moins de 15 mois)
- Singularité phylogénétique (PD50)
- 0.5
- Relation bayésienne longueur-poids
- a = 0.01202, b = 3.09
- VulnérabilitéVulnérabilité faible (10 / 100)
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