One-lined Tetra

Hemigrammus unilineatus

Family : Characidae

FishFreshwaterTetra

The One-lined Tetra is a small silvery fish with a single horizontal black stripe. It schools in South American blackwaters.

One-lined Tetra — photo 1 sur 4 — Carl H. Eigenmann, 1912 · Wikimedia Commons · Public domain1 / 4

Popularity

Community fish

classic in freshwater aquarium

Availability

Common in shops

Shop availability

IUCN Status

Least Concern

Biotope

South America

Hors bassin amazonien : Paraná, Orénoque, Andes.

Description

This tetra reaches about 4 cm. Its body is elongated, silvery, with a thick, clearly visible black stripe from snout to caudal fin. The fins are transparent. It resembles Hemigrammus marginatus but the stripe is wider and continuous. It is very active and swims in tight schools. It is a peaceful and hardy fish, ideal for community aquariums.

Habitat

Region :

Blackwater streams and rivers, flooded forest areas

Distribution :

Recommended parameters

Temperature22–28 °C

pH5.5–7.5

GH2–15 °dGH

KH1–8 °dKH

NO₃

≤ 20 mg/L

PO₄

≤ 0.5 mg/L

Care

Difficulty

2/5

Diet

Omnivore

Min. tank

60 L

Min. group

Adult size

4 cm

Lifespan

4 years

Temperament

Peaceful

Propagation

Care notes

Keep in groups of at least 6 in a 60-liter tank. Water should be soft to moderately hard (GH 2-15), pH 5.5-7.5, temperature 22-28°C. Moderate filtration and subdued lighting are suitable. Omnivorous, accepts flakes, brine shrimp, daphnia. Enjoys a planted aquarium with open swimming areas. Compatible with other small tetras, corydoras, rasboras. Avoid aggressive fish. Breeding is possible in soft acidic water.

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