Overview
The Jewel Tetra, scientifically known as Hyphessobrycon bentosi, is a highly sought-after freshwater species within the aquarium hobby. Frequently available as captive-bred specimens (often denoted as DNZ in European trades), these tetras are prized for their hardiness, vivid coloration, and peaceful demeanor. They make a fantastic addition to South American biotope setups and general community tanks alike.
Distribution and Habitat
In the wild, the Jewel Tetra is endemic to the sluggish tributaries, floodplains, and forest streams of the Amazon River basin in South America. Their natural environment is heavily shaded by the dense jungle canopy and characterized by soft, acidic water tinted brown from decaying organic matter like leaves and branches.
Description of Jewel Tetra
Body shape:
They possess a classic deep-bodied, laterally compressed shape that is typical of many larger tetras in the Hyphessobrycon genus, giving them a robust yet elegant profile.
Color:
The body boasts a beautiful translucent, rosy-pink to deep red hue, which becomes more vibrant in a well-planted tank with dark substrate.
Barbels:
Like all characins, they do not possess barbels.
Snout:
They feature a relatively short snout with a terminal mouth, perfectly adapted for snatching small prey from the water column.
Eyes:
The eyes are proportionately large with a dark pupil, often surrounded by a reflective, reddish or golden rim.
Fins:
Their fins are their most striking feature. The tall dorsal fin displays a prominent dark black blotch topped with a bright white tip. The anal and pelvic fins are heavily suffused with red and also feature distinct white tips.
The Tail:
The caudal (tail) fin is deeply forked and generally transparent with a reddish tint matching the body.
Temper
This species is highly peaceful and rarely bothers tank mates, though males may occasionally flare their fins and mock-spar with one another to establish a pecking order.
Sociality
Jewel Tetras are strict schooling fish. They must be kept in groups of at least 6 to 8 individuals to feel secure, display their best colors, and exhibit natural behaviors.
Activity
They are active mid-level swimmers. During the day, they will constantly dart around the middle strata of the aquarium, exploring plants and interacting with their shoal.
Keeping and Caring for Jewel Tetra
Tank size:
A minimum tank size of 60 liters (15 gallons) is recommended for a small school, though larger tanks are always better to provide ample swimming space.
Water Parameters:
Temperature
Maintain a tropical environment with temperatures ranging between 24-28°C (75-82°F).
pH
They prefer slightly acidic to neutral water, with a pH range of 6.0 to 7.5.
Hardness
Soft to moderately hard water is ideal, generally between 5 and 15 dGH.
Ammonia, Nitrite, Nitrate
Ammonia and Nitrite must always be at 0 ppm. Nitrates should be kept as low as possible, ideally below 20 ppm through regular water changes.
Lighting
Moderate to dim lighting is preferred. Floating plants can be used to diffuse bright aquarium lights and mimic their shaded natural habitat.
Water flow
A gentle to moderate water flow is sufficient. They do not appreciate excessively strong currents.
Decorations and Plants
A heavily planted tank with plenty of hiding spots is ideal. Driftwood, twisted roots, and dried botanicals (like Indian almond leaves) will make them feel right at home and bring out their best colors.
Diet
Jewel Tetras are omnivorous and not fussy eaters. In the aquarium, they will readily accept high-quality dry flakes and micro-pellets. To ensure optimal health and coloration, supplement their diet with live or frozen foods such as daphnia, brine shrimp, and bloodworms.
Some Feeding Tips
Offer small meals once or twice a day, only feeding what the fish can consume within two to three minutes to prevent water fouling.
Breeding
Breeding the Jewel Tetra is possible in captivity. They are egg scatterers that exhibit no parental care. To breed them, set up a separate dimly lit breeding tank with very soft, acidic water and fine-leaved plants or a spawning mop. Condition the pair with live foods. Once spawning occurs, the adults must be removed immediately, or they will eat the eggs. The fry hatch in about 24-36 hours and require infusoria or liquid fry food once free-swimming.
Conclusion
The Jewel Tetra is a resilient, visually captivating, and easy-to-care-for species that brings life and color to any freshwater aquarium. Their peaceful nature and striking finnage make them a timeless favorite for both novice and experienced aquarists looking to build a vibrant community tank.
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