Spanner Barb, T-Barb (Striuntius lateristriga) — 3,5-4,5cm

Overview

The Spanner Barb (Striuntius lateristriga), also known as the T-Barb, is a striking, active schooling fish from the Malay Peninsula and Borneo. Celebrated for its bold markings and lively behavior, this large barb brings energy and movement to spacious community aquariums. Available for sale UK-wide, the Spanner Barb is an excellent choice for aquarists seeking a robust, semi-aggressive species with moderate care requirements and captivating schooling displays.

Appearance and Coloration

Striuntius lateristriga displays a sleek, silvery body with a distinctive T-shaped or spanner-shaped dark mark on the flank, giving the species its common names. The fins may show subtle yellow or orange highlights, particularly in well-conditioned individuals. This large, active barb has a streamlined, torpedo-shaped body with a forked tail and large, expressive eyes. Males and females are similar in appearance, though males may be slightly slimmer and more colorful during breeding.

Natural Habitat

The Spanner Barb inhabits rivers, streams, and forested waterways across the Malay Peninsula and the island of Borneo. These environments feature soft to moderately hard water, moderate to strong current, abundant vegetation, and submerged wood. The fish form large schools in the wild, foraging for insects, crustaceans, plant matter, and organic debris in mid-water and surface areas.

Aquarium Setup

A minimum 250-litre aquarium is essential for a school of Spanner Barbs, with larger tanks preferred for community setups. Provide ample open swimming space combined with planted zones using robust species like Vallisneria, Amazon Sword, or Anubias. Driftwood and smooth rocks create naturalistic hiding places and territorial markers. Strong filtration and a secure lid are essential, as this species is an active, powerful swimmer that can jump when startled.

Water Parameters

Maintain soft to moderately hard water with pH 6.0-7.5 and temperatures between 22-28°C. General hardness (GH) of 5-12 dGH is ideal. The Spanner Barb is adaptable but performs best in well-oxygenated water with strong circulation. Perform weekly water changes of 25-30% to control nitrate and maintain stable parameters. Avoid stagnant water or poor filtration, which stress this active species.

Feeding and Diet

Striuntius lateristriga is an omnivore that thrives on a varied diet. Offer quality flakes or pellets as a staple, supplemented with frozen and live foods such as bloodworms, daphnia, brine shrimp, and mosquito larvae. Regular vegetable matter or algae-based foods such as spirulina flakes, blanched vegetables, or algae wafers provide balanced nutrition. Feed 1-2 times daily in portions that are consumed within a few minutes.

Behaviour and Personality

The Spanner Barb is an active, semi-aggressive schooling fish that thrives in groups. Shoaling behavior is most pronounced when kept in larger numbers, with fish moving together in fast, coordinated patterns. This species occupies the mid to upper water column and is constantly on the move. While generally peaceful toward similarly sized, fast-moving fish, it may nip the fins of slow, long-finned tankmates or bully very small species.

Tank Mates

Ideal tank mates include other robust medium to large peaceful fish such as fast-moving barbs, danios, rainbowfish, and large rasboras. Avoid small fish that can be bullied or eaten, long-finned fish, slow-moving fish, very timid species, and shrimp or small invertebrates. The Spanner Barb coexists well with similarly sized, active community fish in spacious, well-filtered aquariums.

Breeding

Breeding is uncommon in home aquaria. If attempted, use a separate breeding tank with fine-leaved plants or spawning mops, soft water (pH 6.0-6.5), and well-conditioned adults. Spawning typically occurs in the early morning, with adults scattering eggs among plants. Remove adults immediately after spawning to prevent egg predation. Fry hatch in 24-48 hours and require infusoria or liquid fry food initially before graduating to baby brine shrimp.

Why Buy from Tropical Fish Co

Tropical Fish Co specializes in healthy, vibrant barbs sourced from reputable suppliers and quarantined for your peace of mind. We provide expert guidance on tank setup, water chemistry, and compatible stocking to help you create a thriving community aquarium. With fast, reliable delivery across the UK and a commitment to sustainable fishkeeping, Tropical Fish Co is your trusted partner for quality freshwater fish.