Butterfly Hillstream Loach

The evolution of this fish's unique disc-shaped and highly flattened body, complemented by large fan-like fins, is due to the peculiarities of its habitat. This shape allows Beaufortia to firmly attach to the surface of rocks, effectively resisting strong currents. Outwardly, it resembles classic Gastromyzon, which live in similar conditions, which is why it is often mistakenly attributed to this group. Adults reach a length of 6–7 cm. Sexual dimorphism is subtle, and the fish are most reliably sexed from above: females are noticeably broader and heavier-framed, with the snout almost continuous with the line of the pectoral fins. The body coloration is brown, with characteristic black speckles over the entire surface.

The natural habitat of Beaufortia is in modern China. Wild specimens were first discovered in Guizhou province, located in a mountainous region in the southwest of the country. These fish inhabit numerous mountain streams characterized by fast currents and an abundance of rapids. Their habitat is distinguished by rocky substrates and a complete absence of aquatic vegetation. Shallow and well-lit bodies of water create favorable conditions for the growth of algae, which cover stones and boulders with a thin layer. This biofilm, which serves as a home for various microorganisms, is their main food source.

Beaufortia demonstrates a calm attitude towards representatives of other species that do not show aggression. However, due to its specific requirements for keeping conditions, choosing tank mates becomes a difficult task. In the wild these fish live in loose aggregations, so it is recommended to acquire six or more individuals — only in such company do they behave naturally. In large aggregations, a clear internal hierarchy is formed, but intraspecific conflicts are not observed. Females tend to stay together, while the alpha male occupies the most preferred spot, not allowing others near it. Subdominant males share the remaining space on the bottom.

For a single pair of fish, an aquarium of at least 60 liters is considered optimal. The decor uses gravel and rocky substrates, as well as large smooth stones and similar elements. The presence of aquatic plants is not mandatory. Natural snags can promote active algae growth. Since the Butterfly Hillstream Loach lives in flowing waters, it needs very clean, oxygen-rich water. In addition, it is important to ensure internal current. For example, for a 50-liter aquarium, the filter capacity should be 500 liters per hour, although in small volumes, a less intense current is acceptable to avoid excessive swirling.

An important aspect of Beaufortia's diet is the inclusion of algae, the growth of which should ideally be stimulated directly in the aquarium. Alternatively, a separate tank with bright lighting can be used, where various objects are covered with algae and then alternately placed in the main aquarium. If it is not possible to maintain an additional tank, it is necessary to purchase special gel-based plant-based foods. A small amount of gel should be applied to the side of a stone located against the current. The use of dry foods is not recommended, as they will be carried away by the current, polluting the water.

As of the preparation of this article, no successful cases of Beaufortia breeding in home aquarium conditions have been recorded. It is sold either from commercial fish farms or caught in the wild.

The main cause of most diseases is somehow related to keeping conditions. Insufficient current, low oxygen levels, excess organic waste, cloudy water with unsuitable pH and GH values, and poor-quality food — all of these, both individually and in combination, are highly likely to lead to a deterioration in fish health. As a rule, various bacterial infections or protozoan infestations are secondary, arising as a result of weakened immunity caused by improper keeping conditions. Thus, it can be stated that a healthy Butterfly Hillstream Loach is a direct consequence of a favorable habitat.

When choosing individuals, attention should be paid to their activity and the condition of their skin. A healthy fish should exhibit natural behavior: actively moving across surfaces, scraping off growths, or firmly adhering to glass and stones. Avoid specimens with visible fin damage, ulcers, film, or an unnaturally swollen abdomen. — Examine the belly: in a healthy individual, it should be flat, not sunken, which may indicate emaciation. — Check the reaction: the fish should react quickly to approach and try to hide or fix itself on a surface. — Ensure there are no signs of stress, such as pale coloration or rapid breathing, which are often observed under poor keeping conditions in retail aquariums.