Juvenile form

Overview

Juveniles display more vivid contrast and proportionally larger fins. With age the body elongates and develops its characteristic silver sheen.

Appearance

Shared with the species: Bala Shark

The bala shark has a silvery, streamlined body with large reflective scales and distinctive black edges on all fins, which create the shark-like silhouette that gives the species its common name. The dorsal fin is tall and pointed, and the caudal fin is deeply forked for powerful swimming. Adults reach 25–35 cm in length, although aquarium specimens typically grow to 25–30 cm under normal conditions.

Care

Shared with the species: Bala Shark

Bala sharks require a very large aquarium — a minimum of 300–500 liters for a group of 3–4 fish, as they are active, open-water swimmers that need space. Optimal water temperature is 22–28 °C, pH 6.5–7.5, and hardness 5–12 dGH. Powerful filtration with moderate current and regular 25–30% weekly water changes are essential. The tank must be tightly covered since bala sharks are strong jumpers. They must be kept in groups of at least 3–5, as solitary individuals become timid and stressed.

Feeding

Shared with the species: Bala Shark

In the wild, bala sharks feed on crustaceans, insects, small fish, and algae. In the aquarium they readily accept high-quality flake and pellet foods, live and frozen foods such as bloodworm, brine shrimp, and daphnia, as well as blanched vegetable pieces. Feed twice daily and monitor to ensure all tank mates receive adequate food, as bala sharks eat eagerly and may outcompete slower feeders.

Compatibility

Shared with the species: Bala Shark

Bala sharks are peaceful fish that coexist well with other large, similarly calm species: danios, barbs, rainbowfish, larger tetras, and synodontis catfish. They should not be kept with dwarf species, small decorative fish, or shrimp, as adult bala sharks may inadvertently swallow them. Although they show virtually no aggression, their size and energy level can intimidate slow-moving tankmates. Best kept in groups of three or more.

Breeding

Shared with the species: Bala Shark

Breeding bala sharks in the home aquarium is extremely rare and has not been reliably reported. In the wild they are pelagic, open-water spawners that scatter eggs in large rivers. Commercial production takes place on fish farms in Asia using hormonal induction in large outdoor ponds. Sexing is difficult; females may appear rounder in the abdomen during spawning season. All aquarium stock is commercially bred.

Fun facts

Shared with the species: Bala Shark

The bala shark is listed as Vulnerable to Endangered on the IUCN Red List due to large-scale collection for the aquarium trade and widespread habitat destruction. In the wild they form large schools of hundreds of individuals. Despite the name, the bala shark is an omnivore entirely unrelated to true sharks.