The Bala shark is a large, fast-swimming silver cyprinid (not a true shark) with bold black-edged fins. Despite being sold tiny, it is a powerful schooling fish that quickly outgrows most home tanks. Endangered in the wild, but all aquarium stock is commercially bred.
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From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
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Minimum
Sub-adult group tank
125 gal / 473 L long tank
Balantiocheilos melanopterus reaches 12–14 in and is a fast, skittish schooler. A 125-gallon long is a practical minimum for a small group of 4+, with very strong filtration and a tight lid (they jump when startled).
Photo coming soon
Recommended
Adult shoal
180 gal / 681 L long, 6 ft+
Six-foot tank for an adult shoal of 5–6 fish, with smooth décor (they crash into sharp objects), high flow, and large peaceful tankmates. Single specimens become nervous and stressed.
Photo coming soon
Ideal
Display shoal
240 gal+ / 909 L+ display, 8 ft
An 8-foot display tank or large indoor pond with a shoal of 6+ adults, room to sprint, and strong river-style flow. This is genuinely a fish most home aquariums cannot house long-term.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
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Egg
Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.
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Fry
Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.
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Juvenile
Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.
Adult
Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.
Habitat & enclosure
Native to medium-to-large rivers and lakes of Southeast Asia (Mekong, Chao Phraya, and rivers of Borneo, Sumatra, and the Malay Peninsula), where it is now Endangered and possibly extirpated from several basins; the aquarium trade is supplied entirely by farmed fish. Needs a long, spacious aquarium — a minimum of around 280 L (75 gal) for a small group, with 470 L (125 gal) or larger strongly preferred for a proper school of adults. Tank length matters more than height; provide open swimming lanes. Water: temperature 22-28 C (72-82 F), pH 6.0-8.0, soft to moderately hard, well-oxygenated with good flow. A tight-fitting lid is essential as they are accomplished jumpers.
Substrate
Smooth sand or fine rounded gravel suits their open-water habits. Aquascape with driftwood, smooth rocks, and hardy plants placed around the edges to keep the central swimming area clear.
Equipment & setup
Strong filtration (canister or oversized HOB) to handle the bioload and provide current, a heater, and a securely weighted lid. Brisk water movement and good surface agitation maintain the high oxygen levels they prefer. No special lighting required.
Diet
Omnivorous and unfussy. Offer a quality sinking/floating pellet or flake as a staple, supplemented with frozen or live foods (bloodworm, brine shrimp, daphnia) and blanched vegetables/algae. Feed two or three times daily while growing; avoid overfeeding the often frantic feeders.
Behavior & temperament
Peaceful but skittish and energetic — sudden movements can startle the whole group into bolting. A true shoaling species best kept in groups of five or more; loners or pairs develop pecking-order bullying. Their large eventual size and fast swimming mean small tankmates may be intimidated or eaten, though they are not aggressive. Not handleable; observe only.
Health
Hardy if given space and clean, oxygen-rich water. Stunting, spinal deformity, and stress-related disease are common when kept in undersized tanks. Susceptible to ich and other freshwater parasites under stress; sensitive to poor water quality and low oxygen. Quarantine new fish.
Tips, DIY & hacks
Buy a school, not a single fish, and plan for adult size before purchasing — these 7 cm juveniles become 30 cm adults. If you cannot provide a 125 gal+ long tank, choose another species. A dim, secure room edge and floating plants help reduce the panic-bolting that can cause injury.
