Overview
The Blackberry Tetra (Hyphessobrycon wadai) is a relatively new and incredibly popular addition to the aquarium hobby. Formally described in 2016, this species has captivated fishkeepers with its unique dark, berry-like coloration. As a member of the Characidae family, it exhibits the classic tetra charm but stands out as a true centerpiece in appropriately scaped aquariums.
Distribution and Habitat
Endemic to South America, the Blackberry Tetra is primarily found in the Rio Tapajós basin in Brazil. In its natural habitat, it thrives in clearwater tributaries characterized by sandy substrates, submerged tree roots, and scattered leaf litter. These waters are typically slightly acidic and well-oxygenated.
Description of Blackberry Tetra
Body shape:
They possess a classic rhomboid, laterally compressed body typical of many species within the Hyphessobrycon genus, allowing them to navigate effortlessly through dense aquatic vegetation.
Color:
Their most defining feature is their striking deep purple to inky-blue body, which darkens to an almost blackish hue under optimal conditions, perfectly resembling a ripe blackberry.
Barbels:
Like all characins, the Blackberry Tetra does not possess any barbels.
Snout:
The snout is short and somewhat blunt, featuring a small, terminal mouth adapted for picking micro-prey from the water column.
Eyes:
They have relatively large, expressive eyes that often feature a bright, reflective blue or reddish ring around the pupil, contrasting sharply with their dark bodies.
Fins:
The dorsal, anal, and pelvic fins display beautiful translucent reddish to vibrant orange hues, creating a spectacular visual contrast against their dark purple bodies.
The Tail:
The caudal (tail) fin is deeply forked and carries the same reddish-orange coloration seen on the other fins, adding to their dynamic appearance when swimming.
Temper
The Blackberry Tetra is a remarkably peaceful species. They do not bother other tank mates and are generally timid if kept alone, preferring the safety and confidence that comes with numbers.
Sociality
This is a highly social, schooling fish. To observe their best behaviors and most vibrant colors, they should be kept in groups of at least 6 to 8 individuals, though larger schools of 12 or more are highly recommended.
Activity
They are active mid-water swimmers. Throughout the day, they will loosely shoal around the middle levels of the aquarium, occasionally darting into plants for cover or exploring the lower levels for food.
Keeping and Caring for Blackberry Tetra
Tank size:
A minimum tank size of 60 liters (15 gallons) is recommended for a small school, though a 20-gallon long tank is ideal as it provides ample horizontal swimming space.
Water Parameters:
Temperature
Maintain the water temperature between 22-26°C (72-79°F) to mimic their tropical South American habitat.
pH
They prefer slightly acidic to neutral water, with a pH range of 6.0 to 7.2 being optimal.
Hardness
Soft to moderately hard water is best, ideally kept between 2 and 12 dGH.
Ammonia, Nitrite, Nitrate
Water quality must be pristine. Ammonia and Nitrite must always be at 0 ppm, and Nitrate should be kept consistently below 20 ppm through regular water changes.
Lighting
Moderate to dim lighting is preferred. Floating plants can be used to diffuse bright lights, which will help the tetras feel secure and encourage them to display their deepest, darkest colors.
Water flow
A gentle to moderate water flow replicates the sluggish to moderately moving tributaries they originate from.
Decorations and Plants
A heavily planted tank with dark substrate brings out their best colors. Driftwood tangles, dried botanicals (like almond leaves), and dense background plants will make them feel right at home.
Diet
Blackberry Tetras are omnivorous micro-predators. In the aquarium, they will readily accept high-quality crushed flakes, micro-pellets, and freeze-dried foods. To ensure optimal health and coloration, their diet should be supplemented with live or frozen foods such as daphnia, baby brine shrimp, and bloodworms.
Some Feeding Tips
Feed them small amounts once or twice a day—only what they can consume within two minutes. Because they have small mouths, ensure that pellets or granules are appropriately sized.
Breeding
Breeding is similar to other Hyphessobrycon species. They are egg scatterers that exhibit no parental care. To breed them, set up a separate, dimly lit breeding tank with soft, slightly acidic water and fine-leaved plants like Java Moss or spawning mops. Condition the adults with live foods, introduce a healthy pair or small group to the breeding tank, and remove them immediately after spawning to prevent them from eating the eggs. The fry will hatch in 24-36 hours and require infusoria until they are large enough to eat baby brine shrimp.
Conclusion
The Blackberry Tetra is a truly spectacular fish that offers a rare and beautiful color palette to the freshwater hobby. Their peaceful demeanor, relatively straightforward care requirements, and stunning purple-and-red contrast make them an outstanding choice for both intermediate and experienced aquarists looking to create a vibrant, harmonious community aquarium.
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