Hillstream Loach - Sewellia lineolata 2-3cm

from £10.75

The Sewellia lineolata, commonly known as the Hillstream Loach, Reticulated Hillstream Loach, or Tiger Hillstream Loach, is a truly remarkable freshwater fish native to the fast-flowing, oxygen-rich streams and rivers of Vietnam and Laos.

These captivating loaches have evolved a unique flattened body shape resembling a miniature stingray, perfectly adapted for clinging to rocks in strong currents.

Their bodies display an intricate pattern of golden to brown reticulated markings against a darker background, with enlarged pectoral and pelvic fins that act like suction cups, allowing them to maintain position on smooth surfaces even in torrential flow.

Growing to approximately 6-8 centimetres in length, they are as functional as they are beautiful, spending their time grazing algae and biofilm from rocks and glass with their specialised underslung mouths.

Hillstream Loaches have very specific requirements that set them apart from typical tropical fish. They absolutely require highly oxygenated water with strong flow, achieved through powerful filtration and additional powerheads or wavemakers to replicate their natural fast-flowing habitat.

Water temperature should be kept cooler than most tropical species at 20-24°C, with pristine water quality maintained through regular changes.

These peaceful fish do best in groups of five or more and appreciate an aquarium decorated with smooth river rocks, pebbles, and driftwood, with minimal substrate.

Their diet should consist primarily of algae wafers, blanched vegetables such as courgette and cucumber, and occasional protein from bloodworms or brine shrimp.

With their specialised care requirements met, including excellent water quality and proper flow, Hillstream Loaches can live 8-10 years, making them a rewarding challenge for experienced aquarists seeking something truly unique for their higher-flow aquarium setups.


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The Sewellia lineolata, commonly known as the Hillstream Loach, Reticulated Hillstream Loach, or Tiger Hillstream Loach, is a truly remarkable freshwater fish native to the fast-flowing, oxygen-rich streams and rivers of Vietnam and Laos.

These captivating loaches have evolved a unique flattened body shape resembling a miniature stingray, perfectly adapted for clinging to rocks in strong currents.

Their bodies display an intricate pattern of golden to brown reticulated markings against a darker background, with enlarged pectoral and pelvic fins that act like suction cups, allowing them to maintain position on smooth surfaces even in torrential flow.

Growing to approximately 6-8 centimetres in length, they are as functional as they are beautiful, spending their time grazing algae and biofilm from rocks and glass with their specialised underslung mouths.

Hillstream Loaches have very specific requirements that set them apart from typical tropical fish. They absolutely require highly oxygenated water with strong flow, achieved through powerful filtration and additional powerheads or wavemakers to replicate their natural fast-flowing habitat.

Water temperature should be kept cooler than most tropical species at 20-24°C, with pristine water quality maintained through regular changes.

These peaceful fish do best in groups of five or more and appreciate an aquarium decorated with smooth river rocks, pebbles, and driftwood, with minimal substrate.

Their diet should consist primarily of algae wafers, blanched vegetables such as courgette and cucumber, and occasional protein from bloodworms or brine shrimp.

With their specialised care requirements met, including excellent water quality and proper flow, Hillstream Loaches can live 8-10 years, making them a rewarding challenge for experienced aquarists seeking something truly unique for their higher-flow aquarium setups.


Scientific name: Sewellia lineolata

Common name: Reticulated Hillstream Loach, Hong Kong Pleco, Butterfly Pleco

Adult Size: 2 to 3 inches (5 to 7.5 cm)

Temperature Range: 72 to 79°F (22 to 26°C)

pH Range: 6.5 to 7.5

Compatibility: Generally peaceful, but they can be territorial with their own kind. They do well in groups of their own species, but it's important to provide plenty of hiding spots and territories.

Minimum Tank Size: 60 liters, but a larger tank is better for a group

Originates from: Southeast Asia, specifically Vietnam and Laos

Ideal Substrate: Fine sand or small, smooth gravel, with plenty of rocks and crevices for hiding

Ideal Tank Mates Suggestions: Peaceful fish that can thrive in well-oxygenated, fast-flowing water conditions, such as Hillstream Loaches, White Cloud Mountain Minnows, and other small, community fish.

Fish to avoid: Aggressive or large fish that might see the Striped Loach as food, and species that require still water conditions.

Diet: Omnivorous; they will eat a variety of foods including high-quality sinking pellets, live food, and frozen food. They also enjoy algae and can help keep the tank clean. Provide a diet rich in plant matter and algae-based foods.

Breeding: Breeding Sewellia lineolata in captivity is challenging and not commonly achieved. They are egg layers and typically scatter their eggs on rocks and other surfaces. Providing a well-structured tank with plenty of hiding spots and clean water conditions can encourage breeding, but success is not guaranteed.