Panda Loach

The panda loach (Yaoshania pachychilus) is a small, strikingly patterned hillstream loach endemic to a handful of headwater tributaries draining Dayao Mountain in Guangxi, southern China. Formerly classified as Protomyzon pachychilus, this species reaches only 5–6 cm (2–2.4 in) and is named for its bold black-and-white colouration reminiscent of a giant panda — a pattern that is most vivid in juveniles and tends to fade somewhat as the fish matures. In the wild it inhabits clear, fast-flowing, well-oxygenated streams with rocky substrates and abundant biofilm.

This species requires a cool-water, high-flow aquarium replicating a hillstream biotope. A tank measuring at least 60 × 30 cm (~54 L / 15 gal) with strong water movement of 15–20 times turnover per hour is essential. Smooth water-worn pebbles, gravel, and bright lighting promote the algae and biofilm growth that form the bulk of their diet. Water temperature must be kept cool at 20–24°C with pH 6.5–7.5 and moderate hardness. They cannot tolerate warm, stagnant conditions or immature tanks with insufficient algae. A tight-fitting lid is important — they are capable of climbing the glass.

Panda loaches are peaceful, social fish that should be kept in groups of at least four to five. They are primarily grazers of aufwuchs and soft algae; supplement with high-quality sinking algae wafers and spirulina-based foods, plus occasional frozen bloodworm and Daphnia in moderation. Excess protein can cause internal health issues. Suitable tankmates include white cloud mountain minnows, small Danio species, and other peaceful hillstream specialists. Breeding in captivity is very rare; most specimens are wild-caught.