Banded Pseudogastromyzon

Pseudogastromyzon fasciatus is native to the Pearl River system in southern China and is distinguished from its congeners by a series of clearly defined vertical dark bands on a pale cream background — a banding pattern more similar to some Gastromyzon species than to the spotted P. myersi or blotched P. cheni. This clear patterning makes it particularly attractive and has contributed to its regular appearance in the aquarium trade.

The species' care requirements are typical of Chinese hillstream loaches: cool, well-oxygenated, fast-flowing water with a smooth substrate offering abundant grazing surfaces. P. fasciatus is slightly more temperature-flexible than some Vietnamese species but should still be kept at or below 24 °C for long-term wellbeing. In warm-climate fishrooms, a chiller is a worthwhile investment.

When groups are kept together, dominant males may briefly display at rivals by flattening against a stone with pectoral fins spread and body arched, but these interactions rarely escalate. The species makes an excellent candidate for a multi-species hillstream display and its vertical banding creates pleasing visual contrast alongside the reticulated patterns of Sewellia species.

Water: 18–24°C, pH 6.5–7.5, GH 4–15, KH 2–8; strong flow from powerhead or circulation pump; surface agitation to maintain near-saturated dissolved oxygen. Tank: 70 L minimum; smooth flat stones over fine gravel; avoid silting which prevents biofilm development on grazing surfaces. Feeding: Biofilm and algae are the dietary staples; supplement with spirulina wafers, algae-based gel foods, and blanched leafy vegetables. Breeding: Eggs deposited under flat rocks; condition with increased flow and 2–3°C temperature drop via water change; fry require biofilm and infusoria. Compatibility: Peaceful community species; well-suited to cool-water biotopes alongside other hillstream loaches, danios, or White Cloud Mountain Minnows.