Overview
Sewellia lineolata, known as the Hillstream Loach, is a fascinating species for aquarists. These fish require a well-oxygenated, clear water environment with plenty of hiding spots. With a lifespan of 7 years, they are a long-term commitment. Their olive green color and slender body shape add a unique aesthetic to the tank. Despite their moderate activity level, they are generally peaceful and can be kept with a variety of other species. As with any fish, it is important to ensure that the tank is appropriately sized and the water parameters are maintained within the appropriate range.
Scientific Classification
| Rank | Classification |
|---|---|
| Family | Gastromyzontidae |
| Genus | Sewellia |
| Species | Sewellia lineolata |
| Water type | freshwater |
Natural Habitat
Native to the clear streams of South and Southeast Asia, Sewellia lineolata thrives in fast-moving, oxygen-rich waters.
Appearance
These loaches have a slender body with a silver sheen and distinct lateral lines that run from the head to the tail.
Behavior
The Hillstream Loach is not known for its schooling behavior and is best kept in small groups. It is important to provide numerous hiding spots to prevent stress and encourage natural behaviors.
| Trait | Value |
|---|---|
| Temperament | peaceful community fish |
| Schooling | No |
| Activity level | moderate |
Water Requirements
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 18–23°C (64–73°F) | Use a reliable adjustable heater |
| pH | 6.5–7.5 | Avoid sudden swings |
| Hardness (GH) | 4-15 dGH dGH | Soft to moderately hard |
| Ammonia | 0 ppm | Any detectable ammonia signals a problem |
| Nitrite | 0 ppm | Toxic even at low levels |
| Nitrate | <20 ppm | Manage through regular partial water changes |
| Min. tank | 40L (11 gal) | Larger tanks are easier to keep stable |
Interesting Facts
- They are known to be sensitive to water quality and should be kept in pristine conditions.
- Sewellia lineolata are bottom-dwellers and can be found feeding on small invertebrates and detritus.
- Their long, slender bodies help them navigate through narrow streams and crevices.
📋 Full Care Guide
Ready to set up a tank for your Hillstream Loach? The complete care guide covers tank setup, feeding schedule, common diseases, tank mates, and breeding.
Read Hillstream Loach Care Guide →Related Species
Related Species & Guides
This species profile was reviewed for biological accuracy and practical aquarium care guidance. For suspected illness or disease, test your water parameters first and consult an aquatic veterinarian if symptoms persist.