Penguin Tetra (Thayeria boehlkei)

The Penguin Tetra is a peaceful and visually distinctive freshwater fish best known for its striking black stripe and unique swimming posture, which gives the appearance of a “penguin-like” glide through the water. Native to the slow-moving tributaries of the Amazon Basin in South America, this species adds elegance and personality to any community aquarium.

Calm, hardy, and easy to care for, Penguin Tetras are an excellent choice for both beginner and experienced aquarists. They are schooling fish that feel most comfortable in groups, where their synchronized movement and subtle flashes of silver and black create a beautiful display.

At FintasticFish.ca, Penguin Tetras are a favourite for aquascapes seeking peaceful activity with a visually unique schooling fish.

Care Guide

Penguin Tetras thrive in planted community tanks with plenty of open swimming space. Their peaceful nature makes them compatible with many other non-aggressive species.

• Peaceful and community-friendly
• Prefers planted aquariums with open swimming areas
• Hardy and beginner-friendly
• Best colour and behaviour in stable, clean water conditions

Quick Facts

• Scientific Name: Thayeria boehlkei
• Common Name: Penguin Tetra
• Origin: Amazon Basin, South America
• Adult Size: Up to 6 cm (2.4 inches)
• Temperament: Peaceful, schooling fish
• Tank Level: Mid-water swimmer (often angled posture)
• Minimum Tank Size: 20+ gallons
• Water Temperature: 22–28°C
• pH: 5.5–7.5
• Diet: Omnivore (flakes, micro pellets, frozen/live foods)
• Care Level: Easy
• School Size: 6–10+ recommended