• Scientific name: Beaufortia kweichowensis
• Synonyms: Gastromyzon leveretti kweichowensis (Fang, 1931), Beaufortia kweichowensis kweichowensis (Fang, 1931), Beaufortia kweichowensis gracilicauda (Chen & Zheng, 1980), Chinese Butterfly Loach, Hong-kong Plec, Butterfly Hillstream Loach, Chinese Sucker
• Common name: Butterfly Loach
• Group: Loaches
• Habitat: Asia; South China, Xi Jiang river basin
• Size: 6,5-7,5 cm
• Biotope: Found in the shallow and fast-flowing mountain streams.
• Social behavior: Mostly peaceful and shy loach, but males will form small territories, and will defend it against other fish. It is best to keep them in a species tank, but they can also be kept in a community aquarium with similar demands.
• Diet: Omnivorous; in nature they mainly eat benthic algae and other micro-organisms. In the aquarium they will accept frozen and dried foods too, but their mainly diet should be algae, and other vegetable matter.
• Breeding: It has not been bred in aquarium.
• Tank: Minimum 70 litres
• Population: 4-5 fish for 100 litres
• Decoration: The most important thing is the clean, fast flowing, and well-oxygenated water, which can be achieved by an over-sized filter. Turnover should ideally be 10-15 times of the aquarium volume per hour. Use larger gravel, or smooth, water-worn rocks as substrate, and build some hiding places from rocks.
• Temperature: 16-24 °C
• pH: 6.5-8
• Hardness: 1-12 NK°
• Lifespan: 6-8 years

Description: Beaufortia kweichowensis has a greenish-brown body that covered with dark spots. The fins have a dark spotted line at the edges. It has a streamlined body with a flat belly that adapted well for the rocky bottoms of fast moving streams, where it eats algae from solid surfaces. Butterfly Loach has no scales on its body, that makes it more prone to diseases and more sensitive to medications than other fish. As with all sucker-type Hillstream species Beaufortia kweichowensis also need fast water-flow and well-oxygenated clear water. Lighting should be bright to encourage algae growth, or place their aquarium to get some direct sunlight. Provide hiding places of some larger boulders and smooth stones where they can graze on algae too. They rarely encounter aquatic plants in their natural habitat, so it is not necessary in their aquarium, but Anubias and Microsoreum can be used to maintain the water quality. They should be kept in a small group of 4-5 fish. They are quite shy fish, but when they are frightened, they can be quite quick. This is probably the most frequently imported sucker-type Hillstream Loach in the hobby. Like Gastromyzon, they are protective of their territory and will engage in tests of strength where one fish will try and cover the other fish, referred to as "topping". These battles can be quite entertaining to watch, and rarely end up with any damage, usually one fish will give up and leave the territory. Their natural habitat is one of the most populated and industrialised in China, and the rivers here are highly polluted.

It is hard to distinguish between the sexes, males have a more squarer snout and their pectoral fins emerging almost at right-angles when viewed from above, while females have broader heads and their snout is almost continuous with the pectoral fins. Males often have stronger coloration. There are no information about their breeding in aqaurium.