Tetra (Gymnocorymbus ternetzi)

You should familiarize yourself with the Tetra (Gymnocorymbus ternetzi) fish if you’re new to the world of freshwater aquariums. A favorite of both beginning and seasoned aquarists, this small but fascinating species is well-known for its striking appearance and lively behavior. Any tank gains vibrancy and individuality from the Tetra’s shimmering scales and characteristic black markings.

The Tetra is a peaceful fish that is native to South American rivers and streams and does well in classroom environments. In addition to lowering stress levels, this schooling behavior makes for an amazing show as they dart and weave through the water. They are a great complement to community tanks, where they live in harmony with a range of other species, thanks to their gentle nature.

Although taking care of Tetras is not too difficult, there are a few important considerations. They enjoy well-planted tanks with lots of hiding places and slightly acidic to neutral water conditions. These fish will remain vibrant and healthy with regular water changes and a well-balanced diet. Tetras are a great option for anyone wishing to add some color and life to their aquarium because they are resilient and versatile in general.

Description

The body has a complete lateral line, is ovoid, somewhat elongated, fairly tall, and is firmly flattened on the sides. An adipose fin exists. A two-lobed caudal fin is present.

In juvenile fish, the dorsal, anal, and adipose fins are all black and resemble skirts in appearance.

The side is silvery with a yellowish to bluish sheen, and the back is olive-green. Three transverse black stripes, which turn gray with age, run through the eye, behind the gill cover, and start of the dorsal fin on the front of the body. The caudal fin on the male may have a white tip while still remaining black in color.

Size:

Behavior and compatibility

Schooling fish are peaceful fish that stay in the middle layer of the water. It is best to have at least 6–8 of them around; if they are left alone, they may become aggressive.

Okay in a regular aquarium, but avoid keeping them with fish that have veil fins.

Since this is a schooling species, try to purchase as many as you can in groups of ten or more. This will make the fish more gregarious, less bashful, more visible, and more likely to behave naturally.

Aquarium

An aquarium with basic measurements of 60 * 40 cm and 70 liters will be suitable for a small group.

Very simple in terms of design. This species enjoys lots of open space for swimming because it is an active one. Can be kept in a standard aquarium, in areas with floating plants that diffuse light, or in places with thickets of plants.

Water parameters:

Outside temperature: 20–26 °C pH range: 5.8 to 8.5 Intensity: 5–19 °DGH

Clear water, with a weekly partial change.

Feeding

The most humble, omnivorous of all species. Along with frequent feedings of frozen and small-live food (bloodworm, tubifex, corethra, daphnia, and cyclops), flakes and granules are advised. It is advised to supplement a fish diet with plant-based foods.

They will not eat food that has dropped to the bottom; instead, they would rather take food from the surface and the water column.

Sexual Dimorphism

Compared to females, males are somewhat smaller and noticeably thinner. The anal and dorsal fins of the male are more pointed.

At 8 months, they reach sexual maturity, and they don’t start reproducing until they are 4 cm long.

Breeding

Breeding them is fairly simple; all you need to do is take a 45*30*30 spawning aquarium and place bushes of small-leaved plants or an artificial fiber washcloth on the bottom, along with a separator net.

A few days prior to putting these fish in an aquarium for reproduction, you should separate the males and females. Their preparedness for spawning increases with intensive feeding with living food.

For spawning, a pair or group with a preponderance of males is positioned (males in the evening, females in the morning).

On the plants, the female can deposit up to 1000 eggs. After being removed, the fish consume the eggs. In their early stages of life, eggs and fry are sensitive to light.

After 18 to 36 hours of incubation, the fry begin to swim after 3 to 4 days.

Infusoria is the starter food; as they get bigger, they move to Artemia nauplii. The best way to sort fry is by size—cannibalism.

The average lifespan is five years.

Common Name Tetra
Scientific Name Gymnocorymbus ternetzi
Origin South America
Size Up to 2 inches (5 cm)
Tank Size Minimum 10 gallons
Water Conditions pH 6.0-7.0, Temperature 72-78°F (22-26°C)
Diet Omnivorous, enjoys flakes and small live or frozen foods
Behavior Peaceful, prefers to be in schools of 6 or more
Tank Mates Compatible with other peaceful fish
Notes Known for its distinctive black and white coloration

To sum up, aquarium enthusiasts will find the Tetra, or Gymnocorymbus ternetzi, to be an excellent option. It gives a splash of color and energy to any tank with its eye-catching appearance and lively behavior. These fish are a visual treat in home aquariums because of their striking black markings and shimmering scales.

In addition to being aesthetically pleasing, Tetras require little maintenance, which makes them appropriate for both novice and seasoned hobbyists. Since they do well in classrooms, it is best to keep them in groups to minimize stress and guarantee their happiness. They are a flexible addition to your aquatic setup because of their peaceful nature, which allows them to get along with a wide range of other fish species.

Tetras require a clean, well-maintained tank with consistent water conditions in order to stay healthy. They favor a pH range that is similar to their natural habitat, from slightly acidic to neutral. Their vivid colors and energetic behavior can be preserved with regular water changes and a healthy diet.

All things considered, Tetras can enhance the beauty and enjoyment of your aquarium. They are an excellent option for designing an enthralling and peaceful underwater environment because of their vibrant schooling behavior and striking appearance.

Aquarium enthusiasts favor tetras, especially Gymnocorymbus ternetzi, because of their colorful, peaceful, and adaptable nature. These fish, also referred to as Black Widow Tetras, stand out in any tank thanks to their sleek, black bodies and vivid red eyes. They flourish in classrooms, are simple to maintain, make great additions to community tanks, and give your aquarium vibrant movement. Whether you’re a novice or an experienced aquarist, knowing Tetras’ requirements and traits will help you design a vibrant and eye-catching aquatic habitat.

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Ivan Kononov

Experienced aquarist with an emphasis on breeding and keeping exotic aquarium fish. Author of many articles and books on the topic of aquarium keeping. Always in search of new species and interesting solutions for home aquariums. I believe that an aquarium is not only a home decoration, but also a means of studying nature and its laws.

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