银鲨 · Silver Shark

Overview

Young Balantiocheilos melanopterus are widely sold, but an adult group demands far more room than an ordinary home aquarium provides. Long-term housing should be secured before purchase, with the whole group's eventual size and constant activity in mind.

Distribution & habitat

Confirmed populations originate from Borneo and Sumatra; occurrence on the Malay Peninsula remains less certain. Indochinese records involve a different fish. This open-water species mainly inhabits rivers but also uses natural lakes. Wild populations have declined in some areas, while aquarium stock is thought to be supplied almost entirely by commercial breeders.

Aquarium setup

Swimming room and clean water take priority over ornamentation. Where space permits, gravel, rounded stones, boulders and a little wood can create a river setting. Substantial mature filtration is necessary to handle waste while maintaining circulation and oxygenation.

Startled fish can jump with considerable force. Secure the aquarium with a close-fitting, heavy lid rather than relying on a loose cover.

Diet & feeding

The natural diet mixes insects and crustaceans with algae and plant material. Supplement good prepared foods with varied small live or frozen fare. Plant foods can include peeled peas, softened zucchini and spinach, as well as chopped fruit. Larger individuals can also take pieces of earthworm, shrimp or mussel.

Behaviour & compatibility

Usually mild in temperament, it will nevertheless consume very small fish. Its energetic swimming and feeding can also overwhelm timid or slow companions. Suitable tankmates are robust fishes of similar size sharing its environmental requirements, housed in a very large aquarium.

Keep at least five together. A group develops a hierarchy; with only two or three fish, a subordinate may receive repeated harassment. An isolated individual may instead direct aggression toward similar-looking tankmates. Social association does not necessarily mean tightly synchronized schooling.

Sexual dimorphism

Mature females are generally broader through the body. Juveniles cannot be reliably sexed by appearance.

Breeding

Commercial production uses hormone-assisted methods. This does not establish an easy home-breeding route, and ordinary aquarium reproduction has not been clearly documented.

Notes

Despite shark-related trade names, this is a cyprinid. Its demanding adult accommodation should be planned in advance; returning an oversized fish to a retailer is not a dependable housing strategy.