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Longfin Zebra Danio
Danio rerio
Animalia›Chordata›Actinopterygii
Variety of Zebra Danio · longfin
📍 India
A selectively bred variety of the classic zebrafish featuring dramatically elongated, flowing fins on both the caudal and other fins, while retaining the iconic blue-and-silver horizontal striping. It is equally hardy and easy to care for as the standard short-fin form, though its long fins are susceptible to fin-nipping from boisterous tankmates.
Care Guide
Diet
Longfin Zebra Danios are omnivorous and should be fed high-quality flake food or small pellets as a staple, supplemented 2-3 times weekly with live or frozen foods such as brine shrimp, daphnia, or bloodworms. Feed small amounts once daily, only what they can consume in 2-3 minutes, as they are prone to overfeeding.
Behavior
These active, schooling fish are highly energetic and require plenty of open swimming space to display their natural darting and chasing behaviors. They are peaceful but may nip at the flowing fins of slower-moving fish, so tank mates should be selected carefully. They are most active during daylight hours and spend most of their time in the upper water column.
Breeding
Breeding Longfin Zebra Danios in captivity is moderately difficult and requires conditioning with high-quality foods and slightly cooler water temperatures (around 65-68°F) followed by a gradual temperature increase to trigger spawning. They are egg-scatterers that produce hundreds of eggs but show no parental care; eggs and fry must be separated from adults to prevent predation. Fry are tiny and require infusoria or liquid fry food initially before graduating to micro pellets.
Tank Mates
Similar size, temperament, and water requirements; compatible schooling behavior
Closely related species with matching activity levels and peaceful nature
Same genus with identical care needs and compatible social dynamics
Similar size and peaceful temperament; slightly slower but compatible with active danios
Small size may trigger chasing; only suitable in larger tanks with dense vegetation for refuge
Peaceful bottom-dweller that occupies different water zone; helps maintain tank cleanliness
Common Diseases
Ich (Ichthyophthirius multifiliis)
White spots on body and fins, flashing against objects, rapid breathing, lethargy
Raise water temperature gradually to 28-30°C, perform daily 25% water changes, use aquarium salt (1 teaspoon per 5 gallons) or commercial ich treatment; maintain for 10-14 days
Fin Rot
Fraying or deterioration of fin edges, discoloration at fin margins, fin shortening
Perform 25-50% water changes every 2-3 days, improve water quality and reduce stress, use antibacterial medication if severe; remove sharp decorations that may damage delicate fins
Columnaris (Flexibacter columnaris)
Whitish or grayish patches on body, mouth rot, fin erosion, loss of appetite
Increase aeration, perform daily 50% water changes, use antibacterial medication or salt treatment; isolate affected fish if possible and maintain pristine water conditions
Dropsy
Bloated abdomen, protruding scales, lethargy, loss of appetite, pale coloration
Isolate affected fish, perform frequent water changes, feed high-quality foods sparingly, use antibacterial medication; prognosis is poor once symptoms appear, so prevention through good water quality is critical
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Water it likes
- ph
- 6.5–7.5
- ammonia
- 0 ppm
- nitrate
- <20 ppm
- temperature
- 64–77°F (18–25°C)