泰国虎鱼 · Siamese Tiger Perch

Overview

The large freshwater predator Datnioides pulcher usually carries four broad dark bars, exceptionally five. Its space and filtration demands restrict it to public displays or exceptionally large private aquariums. The size of a juvenile offered for sale is not a sound basis for lifetime housing.

Distribution & habitat

Historical records include Thailand's Mae Klong and Chao Phraya, the middle and lower Mekong across Thailand, Laos, Cambodia, and Vietnam, and Vietnam's Dong Nai. The type locality is Bueng Boraphet in the central Thai Chao Phraya basin.

It occupies large, deep lowland freshwater rivers and also enters flooded forest during the wet season. Brackish habitat use is not expected. Historical assessments reported major population losses and local disappearance in Thailand, with dams, bank vegetation removal, pollution, and fishing for food and aquaria considered possible contributors.

Aquarium setup

Provide juveniles and subadults with planted cover, roots, and branches. Larger individuals are less particular about lower-level decoration but still appreciate overhead shelter. Routine marine-salt addition is unnecessary at every life stage.

A substantial waste load requires large external filters or a sump. Adults can damage underwater equipment, so use strong heater protection or position heaters in a separate sump compartment.

Newly transported fish may refuse food and become dark overall with less distinct bars. Settling can be difficult. A similar pattern occurs at night, so temporary darkening alone does not establish their long-term condition.

Diet & feeding

Natural feeding is mainly piscivorous, supported by highly protrusible mouthparts. Juveniles can take bloodworms, small earthworms, and chopped shrimp. Adults accept fish strips, whole shrimp, mussels, live river shrimp, and larger earthworms. Mature fish need not be fed daily; two or three meals weekly are a suitable routine.

Avoid beef heart, chicken, and other mammal or bird meat because some fats are poorly processed and can contribute to deposits and organ problems. Feeder fishes are not essential and can introduce disease or parasites; their nutritional value may also be poor without prior conditioning.

Behaviour & compatibility

Similar-sized fishes are possible companions only with ample room. Strongly territorial or competitive species may intimidate it, while small fishes are potential prey.

Young may gather, but adults are generally unsociable and can attack conspecifics or similarly shaped fishes. Single housing is the more straightforward option. If several are kept, a group of at least five requires correspondingly extensive space; that conflict-management number is not an aquarium-capacity recommendation.

Notes

Datnioides microlepis is sometimes substituted in trade. Bar counts offer a clue, but some comparisons rely mainly on Bornean specimens of that relative and should not be applied mechanically to every locality. Adults here tend toward orange-brown rather than the grayer yellow of the similar species, but several characters should be assessed together.

The first dark bar passes from the nape across the operculum toward the chest and underside, and another occupies the rear tail peduncle. Small scales and a relatively straight predorsal outline also help. Siamese, Cambodian, and Widebar labels alone do not guarantee identity.