Zebra loach

Quick facts

Adult size

8 cm

Lifespan

can live up to 12 years

Tank zone

bottom

Temperament

peaceful

Difficulty

beginner

Schooling

recommended 5+ (critical minimum 3, thrives at 8+)

Water parameters

Temperature

22–26°C

pH

6.0 to 7.5

Hardness

2 to 12 dGH

Tank requirements

Minimum volume

120 L

Minimum length

75 cm

Flow

moderate

Lighting

dim preferred

Substrate

sand

Driftwood

preferred

Hiding spots

needed

Open swimming room

needed

Feeding

Diet: omnivore, feeds primarily at the bottom.

Sinking pellets, frozen bloodworm, frozen brine shrimp, frozen daphnia, live blackworms, and blanched vegetables. They forage actively on the substrate and in rock crevices, poking into every gap. Small snails are eaten when found. Feed once or twice daily with sinking food. They're active during the day, unlike some loach species, which makes feeding straightforward. Not picky about food type.

Nocturnal feeder; drop food after lights out so it can eat without competition.

Compatibility

• Peaceful and active loach that fits into community tanks with medium-sized, non-aggressive species. Less boisterous than yoyo loaches and less territorial than most Botia species.
• Groups of 5+ are recommended. Like all loaches, they're social and show more natural behavior in groups. Single specimens hide excessively.
• Good with barbs, tetras, rainbowfish, corydoras, and other loaches. Avoid pairing with very small nano fish that might be stressed by the loach's active foraging.
• Eats small snails. Useful for controlling pest snail populations. Will also eat ornamental snails, so don't keep with nerites or mystery snails you want to preserve.

Habitat

Native to rivers and streams in the Western Ghats of India, in the states of Karnataka, Maharashtra, and Goa. Found in clear, well-oxygenated streams with rocky substrates and moderate current. The species (Botia striata) was described by Narayan Rao in 1920. The body has a pattern of vertical dark bars on a pale gold background, reminiscent of a zebra (though the bars are often slightly irregular or branching). Adult size is 8–10 cm, making it one of the smaller Botia species and more manageable for home aquariums than clown loaches or yoyo loaches. The species has a more restricted natural range than many commonly traded loaches, and wild populations face habitat pressure from dam construction and pollution. However, the species is commercially bred in sufficient quantities that wild collection pressure is reduced. Tank-bred specimens are widely available. Both sexes look similar; females may be slightly plumper when gravid.

Breeding

Rarely bred in home aquariums. Like most Botia loaches, the species likely requires seasonal environmental triggers that are difficult to replicate in captivity. Commercial breeding uses hormone injection in controlled facilities. Sexing is unreliable based on external features. A few reports describe spontaneous spawning in large, well-established tanks with a seasonal temperature cycle, but these are isolated and not consistently reproducible. Every zebra loach in the general trade is either wild-caught or farm-bred using hormones.

Common problems

Ich is the most common disease issue, usually in newly purchased fish. Treat with temperature elevation (30°C for 10 days) rather than chemical medication; loaches are sensitive to standard ich treatments. Skinny disease (internal parasites) occurs in wild-caught and poorly maintained farm-bred stock; treat with levamisole. Shyness in small groups resolves with more individuals. The species is otherwise hardy and long-lived (8-12 years) in stable, clean conditions. Avoid sharp or abrasive substrate; they rest on the bottom and forage by rooting through it. Sand or smooth gravel is preferred.

Bioload

Bioload coefficient: 2.5 (small loach; moderate waste).

Bioload coefficients are calibrated against the neon tetra as the anchor (1.0). See the methodology page for the formula and how each value was derived.

Further reading

• How to cycle a fish tank
• Stocking ideas by tank size