Fine Spotted Butterfly Hillstream Loach (Beaufortia kweichowensis)

Common Name

Fine Spotted Hillstream Loach. Also commonly sold as Chinese Hillstream Loach, Butterfly Hillstream Loach, Hong Kong pleco, and Chinese sucker fish.

Origin and Habitat

Beaufortia kweichowensis is native to southern China and has been recorded from the Xi Jiang, also called the West River, which is part of the larger Zhu Jiang, or Pearl River system. In nature it lives in fast flowing, shallow streams and river sections with high oxygen, rocky bottoms, and strong current.

That flattened body is not just cute. It is a living suction cup built for clinging to stone in flow, and it thrives when you give it oxygen rich water and lots of surfaces to graze.

Biotope

This is a Pearl River hillstream style fish. The core look is rounded rock, cobble, and boulder, with bright light hitting the stones and a thin living film of algae and microorganisms covering everything.

Biotope Inspired Setup Basics

• Smooth stones and cobble arranged to create one strong flow lane plus calmer pockets behind rocks
• High oxygen at all times, strong circulation plus surface agitation, and extra aeration if the tank runs warm
• Bright lighting helps encourage algae and biofilm growth for grazing

Biotope Fish List, Common and Easier to Source

• White Cloud Mountain Minnow, Tanichthys albonubes
• Rosy Bitterling, Rhodeus ocellatus
• Small, peaceful danionins and minnows that tolerate cooler, high oxygen water and do not harass bottom fish

Biotope Fish List, Rarer and More Specialty Choices

• Other rheophilic loaches and stream fishes chosen carefully to avoid heavy food competition
• Chinese stream gobies in the Rhinogobius group in larger setups with calmer edges

Biotope Plants, Common Aquarium Friendly Stand Ins

In true fast riffles, plants are limited, but aquarium plants can still be used in calmer pockets.

• Java fern attached to rock
• Anubias attached to rock or wood
• Floating plants kept out of the main current lanes, used mainly for comfort and light control

Biotope Plants, Rarer and More Biotope Flavored Choices

• Vallisneria species in the margins to mimic streamside growth in slower sections
• Rheophyte style plant layouts kept only in calm pockets so they are not shredded by flow

Temperature and Water Conditions

A reliable care range is about 68 to 75°F, which is 20 to 24°C. Cooler is generally easier because oxygen stays higher. Warm water is where people get into trouble unless they add serious aeration and flow.

Tropical Fish Co. advice: we do not recommend chasing pH unless you are targeting breeding outcomes. For day to day success, stable temperature, clean water, and very high oxygen matter more than the exact number on a test strip.

Appearance and Size

This is a flattened, spot covered grazer with a wide pectoral fin skirt and a belly suction disc for clinging to rock and glass in current. Adult size is commonly reported around 8 cm, which is about 3.1 inches.

Male vs Female Differences

Sexing is subtle, but there are a few tells once they are fully mature. Females are often fuller bodied, especially when carrying eggs, and tend to look less angular from above. Males can be slightly larger and may show more developed tubercles, small bumps, on the head and fin areas when mature and in breeding condition. Individual variation is common, so the most reliable method is comparing a mature group.

Diet in the Wild

They graze algae and biofilm, plus the tiny invertebrates living in that film. In a healthy river tank they spend the day vacuuming surfaces like a little underwater Roomba with opinions.

Feeding in Captivity

A mature tank that grows real biofilm is the foundation. Then layer in targeted foods. Offer sinking algae wafers and bottom feeder pellets, algae and protein gel foods, and small frozen foods as a supplement, especially for conditioning. Blanched greens can help, but they are not a complete diet.

A simple success check is the belly line. A well fed Beaufortia looks gently rounded, not pinched, and it spends the day grazing.

Behavior and Tank Setup

They are generally peaceful, but they can be territorial about prime grazing spots and will sometimes do the classic hillstream topping behavior where one tries to sit on another. It usually looks dramatic and ends harmlessly.

The best setups are river style tanks with lots of rock surface area, multiple flow zones, and enough food spread out that nobody has to fight over one magic rock.

Breeding

Breeding is not considered reliably established in aquaria by some reference style sources, but many hobby and retail guides suggest it can happen in very mature river tanks. When it does occur, spawning is often suggested to happen in crevices or pits under rocks.

We treat breeding as possible but not guaranteed. If you want to give yourself the best shot, focus on a mature river tank with extreme oxygen and clean water, lots of rock piles and tight crevices, and heavy conditioning on high quality foods.

Breeder’s Tips

• Trigger with seasonal thinking, a slightly cooler period followed by a modest warm up, plus larger water changes that mimic fresh rainwater
• Provide tight rock crevices and under rock pockets that function like spawning caves
• Protect eggs and fry by keeping intakes covered and keeping rock piles complex, because there is no parental care
• First foods should be micro foods living on seasoned surfaces, then powdered fry foods, then baby brine shrimp as size allows
• Water change cadence for fry should be small and frequent, clean water grows fast fish, but avoid blasting flow in the fry zone

Raising Fry

If fry appear, the tank is already doing something right, so do not panic and fix it to death. Keep them in a gentle flow pocket with lots of seasoned rock and biofilm.

Feed tiny foods first, infusoria style microfoods and fine powders, then baby brine shrimp once they can take it. Do small water changes often, keep oxygen high, and provide more grazing surfaces as they grow.

Consider moving fry to a dedicated grow out if adults are outcompeting them at feeding time.

Quick Facts

• Scientific name: Beaufortia kweichowensis
• Common name: Fine Spotted Hillstream Loach
• Other trade names: Chinese Hillstream Loach, Butterfly Hillstream Loach, Hong Kong pleco, Chinese sucker fish
• Adult size: about 3.1 in, which is about 8 cm
• Temperature: about 68 to 75°F, which is 20 to 24°C
• Habitat: fast flowing, shallow, clean streams with rock and very high oxygen
• Flow and oxygen: strong circulation plus surface agitation is essential, add extra aeration if the tank runs warm
• Diet: algae and biofilm grazer, supplements with sinking foods and small frozen foods
• Social behavior: best in a small group with lots of rock surface to reduce squabbles
• Sexing: subtle, females are often fuller, mature males may show more tubercles in breeding condition
• Breeding: possible in highly mature river tanks, not considered reliably established by all references
• Best for: river tank fans who want an active grazer that is always entertaining

Tropical Fish Co. Notes

If you want a fish that makes your whole aquarium feel like moving water, this is it. The Fine Spotted Hillstream Loach is basically a living river stone that learned how to scoot.

Your real job is not feeding the loach. Your job is growing the surfaces it wants to graze. Once the tank is mature and the oxygen is right, they settle in and get busy.