Napo tetra - Moenkhausia naponis

Scientific name: Moenkhausia naponis

Common name: Napo tetra

Family: Characidae

Usual size in fish tanks: 4 - 5 cm (1.57 - 1.97 inch)

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Recommended pH range for the species: 6.4 - 7

Recommended water hardness (dGH): 6 - 19°N (107.14 - 339.29ppm)

0°C 32°F30°C 86°F

Recommended temperature: 24 - 28 °C (75.2 - 82.4°F)

The way how these fish reproduce: Spawning

Where the species comes from: South America

Temperament to its own species: peaceful

Temperament toward other fish species: peaceful

Usual place in the tank: Top levels

Overview

The Napo Tetra (Moenkhausia naponis) is a small, peaceful fish native to the Amazonian waterways of South America. Known for their shimmering appearance and active swimming behavior, these tetras are ideal for community tanks and bring a lively dynamic to any aquarium setup.

Origin and Natural Habitat

Napo Tetras are found in the freshwater rivers and streams of the Amazon Basin. They thrive in slow-moving waters rich in vegetation, where they can find plenty of hiding spots and food sources.

Appearance and Size

Napo Tetras have a sleek, streamlined body with a subtle iridescence that catches the light beautifully. They typically grow to about 4-5 cm (1.57-1.97 inches) in length, making them a perfect addition to smaller aquariums or nano tanks.

Tank Requirements

Tank Size: A minimum of 40 liters (10 gallons) is recommended to provide ample space for schooling behavior.
Water Parameters:

pH: 6.4 - 7.0
Water Hardness: 6 - 19°N (107 - 339 ppm)
Temperature: 24 - 28°C (75.2 - 82.4°F)

Tank Setup: Use a well-planted tank with subdued lighting to mimic their natural environment. Floating plants and driftwood can provide additional hiding spots, while open swimming areas will allow them to display their active behavior.

Temperament and Tank Mates

Napo Tetras are peaceful and thrive in community tanks with other gentle species. Suitable tank mates include small tetras (like neon tetras and cardinal tetras), rasboras, guppies, Corydoras catfish, and peaceful dwarf cichlids like Apistogramma. Avoid aggressive or fin-nipping fish, such as tiger barbs or larger cichlids, which may stress or harm the Napo Tetras.

They are schooling fish and should be kept in groups of at least six to promote natural behavior and reduce stress.

Feeding and Diet

Napo Tetras are omnivorous and will readily accept a variety of foods:

High-quality flake or small pellet foods as a staple diet
Live or frozen treats like bloodworms, daphnia, brine shrimp, or white worms twice a week
Occasional vegetable matter, such as spirulina flakes or blanched spinach

Sexing

Females tend to have fuller, rounder bodies compared to the slimmer males. Males may also display slightly more vibrant coloration during the breeding season.

Breeding

Breeding Napo Tetras can be achieved with careful preparation:

Condition males and females in separate tanks for about a week before introducing them to the breeding tank.
Provide Java moss or fine-leaved plants for the eggs to fall into and reduce the water level to about 8 inches (~20 cm).
Once spawning is complete, remove the parents to prevent them from eating the eggs.
The eggs will hatch in 36-48 hours, and the fry can be fed infusoria until they are large enough to consume newly hatched brine shrimp or finely crushed flake food.

Lifespan

With proper care, Napo Tetras can live between 3 to 5 years in a well-maintained aquarium.

Conclusion

The Napo Tetra (Moenkhausia naponis) is a beautiful, peaceful addition to any community aquarium. Their shimmering colors and active schooling behavior make them a favorite among aquarists. With the right environment, diet, and companions, these tetras will thrive and bring life and vibrancy to your tank.