X-Ray Tetra: Fish Species Profile

The X-Ray Tetra (Pristella maxillaris), also known as the Pristella Tetra, is a captivating freshwater fish renowned for its translucent body, which reveals its internal anatomy, giving it the “X-Ray” moniker. Native to South America, this species is favored by aquarists for its peaceful demeanor and adaptability.

Species Overview

• Common Names: X-Ray Tetra, Pristella Tetra, Golden Pristella Tetra
• Scientific Name: Pristella maxillaris
• Adult Size: Up to 1.75 inches (4.5 cm)
• Life Expectancy: 4 to 5 years

Characteristics

• Family: Characidae
• Origin: South America (Amazon and Orinoco basins)
• Social: Peaceful, schooling
• Tank Level: Midwater
• Minimum Tank Size: 15 gallons
• Diet: Omnivore
• Breeding: Egglayer; relatively straightforward in captivity
• Care Level: Easy
• pH: 6.0 to 7.5
• Hardness: 4 to 8 KH
• Temperature: 64–82°F (18–28°C)

Origin and Distribution

X-Ray Tetras are indigenous to the Amazon and Orinoco River basins in South America. They inhabit a variety of environments, including clearwater streams during the dry season and flooded savannahs during the rainy season. Their adaptability allows them to thrive in both freshwater and slightly brackish conditions.

Colors and Markings

This species is distinguished by its translucent body, allowing visibility of its internal structures. The dorsal and anal fins exhibit striking yellow, black, and white bands, while the caudal fin often displays a subtle red hue. These distinctive markings make the X-Ray Tetra a visually appealing addition to any aquarium.

Tankmates

X-Ray Tetras are peaceful and thrive in community tanks with other non-aggressive species. Suitable tankmates include:

• Other small tetras
• Rasboras
• Danios
• Corydoras catfish
• Dwarf gouramis

It’s advisable to avoid housing them with larger, predatory fish that might view them as prey.

Habitat and Care

To replicate their natural habitat:

• Tank Setup: Provide a well-planted aquarium with open swimming areas. Incorporate driftwood and rock caves to offer hiding spots and mimic their natural environment.
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• Water Parameters: Maintain stable water conditions within the recommended pH and hardness ranges. Regular water changes are essential to keep the environment clean and healthy.
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• Lighting: Standard aquarium lighting is sufficient, as X-Ray Tetras do not have specific lighting requirements.

Diet and Feeding

X-Ray Tetras are omnivorous and have a hearty appetite. A balanced diet includes:

• High-quality flake or pellet food
• Live or frozen foods such as brine shrimp, daphnia, and bloodworms
• Occasional vegetable matter like blanched spinach or zucchini

Feed them small portions multiple times daily, ensuring they consume the food within a few minutes to prevent overfeeding and water quality issues.

Gender Differences

Males are generally slimmer with more intense coloration, while females have a rounder abdomen, especially when carrying eggs.

Breeding

Breeding X-Ray Tetras is relatively straightforward:

• Breeding Tank: Set up a separate tank with a mesh or marbles at the bottom to protect the eggs from being eaten.
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• Spawning: Introduce a conditioned male and female pair. Spawning typically occurs in the early morning, with the female scattering eggs that the male fertilizes.
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• Raising Fry: After spawning, remove the adults to prevent them from eating the eggs. Eggs hatch within 24–36 hours, and fry can be fed infusoria or commercially prepared fry food until they are large enough to accept standard foods.
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Further Research

For those interested in similar species, consider exploring:

• Neon Tetra (Paracheirodon innesi)
• Cardinal Tetra (Paracheirodon axelrodi)
• Glowlight Tetra (Hemigrammus erythrozonus)

These species share comparable care requirements and can coexist harmoniously in a community aquarium.

FAQ

• How many X-Ray Tetras should be kept together? It’s best to keep them in groups of at least six to promote natural schooling behavior and reduce stress.
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• Are X-Ray Tetras suitable for beginners? Yes, their hardy nature and ease of care make them excellent choices for novice aquarists.
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