Bloodfin tetra - Aphyocharax anisitsi

Scientific name: Aphyocharax anisitsi

Common name: Bloodfin 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 - 8

Recommended water hardness (dGH): 12 - 18°N (214.29 - 321.43ppm)

0°C 32°F30°C 86°F

Recommended temperature: 18 - 28 °C (64.4 - 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: Middle levels

Short Description

The Bloodfin Tetra (Aphyocharax anisitsi) is a hardy and vibrant schooling fish native to South America. Known for its striking red fins and silver body, this peaceful species thrives in community tanks and is ideal for beginner aquarists. Bloodfin Tetras are active swimmers and should be kept in groups of at least six to encourage natural schooling behavior. With proper care, these tetras can live for over a decade.

Origin

Aphyocharax anisitsi is native to the Parana River Basin in South America, specifically in Argentina and Paraguay. These fish inhabit clear, fast-moving streams and rivers with abundant vegetation and moderate water flow.

Tank Requirements

A tank of at least 40 liters (10 gallons) is recommended for Bloodfin Tetras, with larger tanks preferable for larger groups. Maintain water temperatures between 18-28°C (64.4-82.4°F), a pH range of 6-8, and water hardness of 12-18°N (214.29-321.43 ppm). Provide plenty of swimming space along with plants and decorations to mimic their natural environment. Moderate water flow and good filtration are essential to replicate their riverine habitat.

Food

Bloodfin Tetras are carnivorous and thrive on a varied diet. Offer live or frozen foods such as bloodworms, brine shrimp, and daphnia to satisfy their preference for meaty meals. High-quality flakes, pellets, and freeze-dried options can be used as staples. Feeding them small portions twice daily ensures they receive the nutrients needed for vibrant coloration and activity.

Compatibility

Bloodfin Tetras are peaceful and ideal for community tanks. They coexist well with other small, non-aggressive species such as rasboras, Corydoras catfish, and other tetras. Avoid housing them with larger or predatory fish that may see them as prey. Keeping them in groups of six or more minimizes stress and encourages natural schooling behavior.

Sexing

Mature males have a hook extending from their anal fins, while females do not. Males are generally more colorful and have a slimmer body profile, whereas females are rounder, particularly when carrying eggs.

Breeding

Breeding Bloodfin Tetras is relatively easy. Set up a separate breeding tank with fine-leaved plants or a spawning mop to catch the eggs. Spawning usually occurs early in the morning. Once spawning is complete, remove the parents to prevent them from eating the eggs. The eggs hatch within 24-36 hours, and the fry become free-swimming after a few days. Feed the fry infusoria or liquid fry food initially, transitioning to finely crushed flakes or newly hatched brine shrimp as they grow.

Lifespan

With proper care, Aphyocharax anisitsi can live for over 10 years. Providing stable water conditions, a varied diet, and a stress-free environment are key to their longevity.